Outboard Loses Power At High Rpm

The reed petals in 2 stroke OUTBOARD engines take an incredible amount of abuse! At peak RPM reed petals are opening and closing hundreds of times per second. Our high-performance outboard motors provide the best acceleration. Once the motor idles on its own, it is warm enough to operate. This high performance engine has a displacement of 941cm3 and features a DOHC powerhead—the only DOHC engine used in the 36. 0 features a gearbox free design by mounting the motor directly into the bottom housing. The 2002 OptiMax 200XS and Pro Max 300X outboards, equipped with the state-of-the-art SmartCraft TM Controller Area Network (CAN) electronic control system, continue the tradition of high performance advanced marine propulsion systems from Mercury Racing. The loss of cooling water that would normally circulate throughout the engine becomes reduced, overheating the affected cylinders. It contains information on ever aspect of repair. 1 liters, these FourStroke outboards produce power to spare, which leads to improved durability, longer life, greater hole shot, increased overall acceleration and awesome top speed. outboards, prop pitch, power,performance the outboard can never achieve its rated RPM range, labors, and will not drive the boat as fast. To provide more low RPM power, as well as enable the engine to produce a lot of high RPM power, a power valve system is used. Normal maximum RPM = hull problem. The force on the crankshaft is in pulses. If the boat is performing poorly and the maximum RPM's are normal and what you are used to, you can look to the hull and some of the external parts. I'm at a loss as to what the hell is wrong! Now WOT just goes to 4800rpm, and stays there happily. The Travel 1003/1003C delivers over 1,000 watts of input power. This may cause engine damage. Even from sea level to Lake Elsinore I loose about 400 RPM off WOT with fuel injection. Boat ownership is a blessing! C&I take immaculate care of our fishing equipment and, after many years of faithful service, finally turned in the old Merc Force for an offshore competitor, the Suzuki 4-stroke 90 hp. Outboard motors require that you start them up and hold the gas until they can idle on their own. While running at full speed I began hearing a long beep. i would check that first then try some differnt fuel. 3: Idle Noise Reduction System - The exhaust gases and the sound are routed through the labyrinth exhaust. The prop diameter is cut down to 14. You can now buy anything from a Direct-Injection two-stroke to a four-stroke or electric outboard, with outputs from two to 557hp and weights from a few kilos to half a metric tonne. KSE’s power steering pumps work well with stock power steering gears (i. It is better to sacrifice a little power (4% per point. same rpm's as before? in general, you set the boat up. If I gave her a little more and got up near 5000 rpms the motor would bog down and start to sputter. This loss of power caused the injector driver to burn out from the "stress". Works for a while, then doesn't. A downloadable repair manual is a digitally delivered book of instructions that provides step-by-step maintenance, troubleshooting and repair procedures. First thing that happens in higher rpm is your engine oil reaching higher temperatures than normal. Any help would be much appreciated. I do more mid-range cruising than ass-hauling, so my current motor is a standard version. we offer an engine substitution programme and a true 24/7 customer service to ensure there is always somebody available to attend our customers no matter where in the. Also an 8000 rpm cast piston is a short lived motorsome say they turn em that high and they live "till it come unwound" if your gonna use a cast piston and turn 8000 rpm very often I would opt for the smaller rod cause at that rpm when the piston fails the smaller rod knocks a smaller hole in the block and is easier to weld up !". If only nailing down the causes of power loss were as simple as a tuber in the tailpipe, we wouldn't make such a hash out of diagnosing them. The exciting performance, power and reliability of the new BF250 four-stroke outboard engine are the result of several exclusive Honda Marine technological features. 2013 DF300 1050 HRS, motor seems to be lacking fuel the higher RPMS. Why do outboard motors of the same power sometimes take different propeller sizes? This is due to differences in lower unit gear ratios. The Mercury 150 4 stroke has not been in my market for years. All of KSE’s power steering pumps. 12, 2015 – At a staggering 153 horsepower per liter, the all-new Mercury Racing Verado 400R outboard is the most powerful consumer outboard ever produced by Mercury and provides the highest power-to-weight of all other four stroke outboards in its class. First thing that happens in higher rpm is your engine oil reaching higher temperatures than normal. The BF250 is a high-performance 3. The simplest way is a check on the RPM's first. On the other hand, if the torque converted is fully locked, or if the clutch is not slipping, these calculations should be reliable. YAMAHA 60 HP 4 STROKE OUTBOARD MOTOR JET DRIVE - When you need to explore the shallow stuff, the F60 Jet Drive (40hp) is the perfect midrange outboard. 4kW (40PS) outboard class—with four valves per cylinder, and an air intake system optimized for maximum efficiency in the high rpm range. An outboard marine engine repair manual is a book of instructions, or handbook, for learning how to maintain, service and overhaul the 40 HP outboard motor to factory specifications. Been fishing just taking it easy on it right now and will take her to dealer after first week of August. In terms of propulsion is comparable with 3 HP petrol outboard. When an outboard motor runs at speed but cannot hold an idle, it usually indicates a problem with the carburetor. Yamaha Outboard 200 HPDI Outboard Yamaha's revolutionary High Pressure Direct Injection was a giant technological leap, delivering fuel at an amazing 700 psi, vs. This is a feature exclusive to the Evinrude E-TEC outboard. Why do outboard motors of the same power sometimes take different propeller sizes? This is due to differences in lower unit gear ratios. The simplest way is a check on the RPM's first. Normal maximum RPM = hull problem. The SPIRIT 1. When in low revs the OB performs fine, but when I rev up it's like the OB goes out of gear and loses power, though the engine screams away. At higher rpm, a synchronizing piston engages the third rocker arm on a high-lift cam (in blue). , look for loss of outboard. b) Operating in a higher elevation causes an RPM loss. You may want to try various pitch props. I have a 1996 Mercury 175 offshore outboard. Diesel outboards of this power have been something of a Holy Grail for many operators and this new outboard is something of a hybrid because whilst it operates on diesel fuel it still has spark ignition. Yamaha advertised its outboard motors as "high-power" engines with "unmatched reliability and durability. If the load is too light, the rpm is too high, and the motor will self-destruct from the inertia of the piston as it goes up and down. Accompanying this weather-induced loss of power is a second, but more subtle, loss. if the rpm climbs, and performance drops, you have a problem with the pump. Having a high power alternator will provide you with a substantial improvement in the availability of electrical power on board. It has a intermittent problem of a high idle 1200rpm surging of 100 to 200 rpm at cruising speed 3500 rpm and loss of power on take off. one thing to check would be your primer ball. DIAGNOSE – ENGINE IDLES TOO HIGH. They could be normal, high, or low, and this will pin point the place to look: A. A blown head gasket in an inboard-outboard engine will cause water to enter the combustion chamber and be discharged out of the exhaust. Power loss (relative to that calculated for a plain bearing of the same dimensions) did not vary widely for the range of geometric variables used. It occasionally will surge back up after a minor drop in rpm. Yamaha has developed a high-pressure direct injection system (HPDI) that's used on seven all-new 2. I took apart the lower unit and couldn't see anything wrong with it. The dependable and quiet 4 stroke engine of the Kuda 20 HP Outboard Motor runs smoothly and smoke free, perfect off the back of small watercrafts. We recommend 4-blade propellers for bass boats and boats with high performance hulls running high horsepower outboard engines. Most Mercury Outboard Ignition systems use a red Wire and/or red/white stripe for the high speed charge coil, and blue and/or blue/white stripe for the low speed change coil. Yamaha Outboard Power Loss Forum Topics 1996 Yamaha 115 Saltwater 2 Stroke S115TXRU no power, loss of RPMs: 7: Vibration and power loss at high rpm 1996 30. I'm not very good with OBs (yet). The Mercury 150 4 stroke has not been in my market for years. ENGINE CRANKED, BUT NOT START (OR STOPS SHORTLY AFTER STARTING) UNSTABLE IDLING / TROLLING (OR ENGINE TENDS TO STALL) Possible cause : • Incorrect by-pass air screw adjustment. Boat will run fine at 4000 all day. SYMPTOM SUMMARY The engine idles too high. To help prevent ventilation, the outboard has an anti-ventilation plate directly above the propeller. On the other hand, an engine that revs past the recommended RPM will have higher than normal wear and can also be damaged by fatigued parts breaking and passing through the engine. We used to wakeboard at green meadow reservoir and had to go from a 19 to 17 prop to get it done. Power Pack (Ignition Module) for Johnson Evinrude Outboard. At rigging time in early spring, the engine was equipped with a propeller that allowed the engine to turn within its recommended rpm range at full throttle. When this happened I backed off the throttle and got it back up to 4500 rpms where it ran smooth again. Loses power after planing Home › Forum › Ask A Member › Mid 80's E/rude V-6 150hp. I'm at a loss as to what the hell is wrong! Now WOT just goes to 4800rpm, and stays there happily. Crafted for less weight and high displacement, 2000 200hp ox66 yamaha outboard has issue with losing power after getting. Went out Sunday and didn't even make it out of the harbour. 2000 200hp ox66 yamaha outboard has issue with losing power after getting on plane. I won't lose. Things that have been suggested from bar stool Merc techs: fuel filter, fuel pump, fuel line/primer ball. 2018 Yamaha F300 V6 4. All information in this publication is based on the latest product information available at the time of approval for printing. Are there any rpm limiting features anyone is aware of? I read something about a possible rpm limiter if the oil level is low. Has new plugs, fuel lines all seem ok, just seems it wants to kick on but splutters and drops back. It contains information on ever aspect of repair. I'm not very good with OBs (yet). The reason the valve bounces is because the spring cannot exert enough load to keep the valve closed. That means the engine can produce snappy mid-range acceleration and plane at a lower speed. The boat or watercraft gets up on plane but cannot reach full operating rpm and fuel consumption increase. At rigging time in early spring, the engine was equipped with a propeller that allowed the engine to turn within its recommended RPM range at full throttle. 150 Engine pdf manual download. The shaft horsepower (SHP) is taken as the maximum continuous rated power output of the engine, measured in horsepower (HP). and/or a lean fuel condition at high RPM that could cause engine damage. Ranging from 115 to 250 hp, Honda Marine’s larger outboard engines deliver an unmatched combination of power, convenience, fuel efficiency, and reliability. Engine is hard to start especially after sitting from a run. (speed limiting operator warning) function that limits the RPMs the engine is capable of attaining. However, after several passes the boat finally did reach 5200 rpm so the service techs chalked it up to perhaps old/bad gas. Between 1500 and 4500 rpm everything is great, but still will run rough after trolling for ten minutes. We were able to get the boat after plowing for 3+ min, at <2000rpm while towing a boarder and after shifting all weight to the bow to plane off and then were able to gradually push the rpms to 2300-2500 without stalling or loss of power. Once I go above about 3,200 RPM, power drops out within anywhere between 10 seconds and a couple of minutes. Manuals contain step-by-step repair procedures, illustrations, pictures and advanced troubleshooting. A high variance in RPM on one cylinder indicates a problem usually in the trigger or CDM module. Blocked fuel filters will prevent the fuel from flowing sufficiently and can cause the engine to lose power, falter when running at low RPM, or fail to start and/or run altogether. several very effective tests. 1 out of 2 people buy the wrong harness. Maintenance Both inboard and outboard jet drives have suggested annual or 100-hour maintenance plans. These include: 1. The "high thrust" Yamahas are designed to perform best at high RPMs. Just like the 2015 F-150. Loss of power and directional control in heavy seas, strong current or high winds. If the fuel pump were bad or weak it would not be able to keep the engine mounted fuel filter even half-full under load, and pumping the bulb while at 2,600-RPM would provide MORE fuel to the engine if it were starved of gas due to fuel delivery system it should increase the rpm and it does not. 5488 x Power (kW) / Speed (RPM). For example, at a No Wake 6 mph, when the outboard is turning a quiet 1200 rpm, the engines in the Sea-Doo are. It trips a RPM Sensor loss. Internal harnesses are about 18 inches long. if the rpm climbs, and performance drops, you have a problem with the pump. I'm at a loss as to what the hell is wrong! Now WOT just goes to 4800rpm, and stays there happily. The heads and higher RPM will produce more power. The "high thrust" Yamahas are designed to perform best at high RPMs. Also for: 175 pro xs optimax. As shown in fig. Power Buying. One example of useful energy storage is the flywheel and crankshaft of a car. It contains information on ever aspect of repair. it could be a slight crack or weathering in the bulb or the hose. Blocked fuel filters will prevent the fuel from flowing sufficiently and can cause the engine to lose power, falter when running at low RPM, or fail to start and/or run altogether. Developed a strange complaint on our 4hp Yamaha OB recently. Suzuki engineers based the DF50A and DF40A engine on Suzuki's proven in-line three-cylinder 12-valve engine. Why does a Mercury outboard lose power while accelerating? you can hear the engine rpm increase, but the boat speed drops off, then the propeller hub is suspect. Engine started fine, revs fine in neutral but once over 3000 revs in gear loses power under load. For offshore operation quick acceleration to power through a following sea may be more important than going fast. Combining its integrated lithium battery and its outstanding efficiency, the Travel is the alternative to a small petrol outboard. Diesel outboards of this power have been something of a Holy Grail for many operators and this new outboard is something of a hybrid because whilst it operates on diesel fuel it still has spark ignition. Compared to 3 blades, 4-blade boat props provide better "hole shot" performance with less steering torque and less vibration at high speeds. You'll find the need for a fair bit of power to "get over the hump," but once the boat's on plane and you're trimmed properly, you should be able to decrease throttle a little without losing speed. This design has reduced the overall size of the outboard while providing high performance power. 4 Reasons Why Engines Lose Power Over Time And How To Win Your Horses Back. An outboard Tohatsu repair manual is a professional book of instructions that list maintenance, repair and overhaul of the boat engine's main components. Mercury outboard. Be sure you are wearing you PDF. Loss of Power in Mercury 115hp EFI 4-Stroke: The engine will rev up to 6000 RPM when I. I haven't yet discussed the prop/rpm issue with anyone else but the supplying dealer so I'll see what Redline's take is on the matter. 150 Engine pdf manual download. A blown head gasket in an inboard-outboard engine will cause water to enter the combustion chamber and be discharged out of the exhaust. An outboard marine engine repair manual is a book of instructions, or handbook, for learning how to maintain, service and overhaul the 40 HP outboard motor to factory specifications. I'm not familiar with the Mercury motors but the little hole should not be pumping water all over your plugs, probably the cause of the power loss Here's a parts layout showing the cover circled. My engine would only squel after running for a while and then coming down to 900 or so RPM's, and sometimes kicking it in and out of gear would make it go away, but only sometimes. (speed limiting operator warning) function that limits the RPMs the engine is capable of attaining. Compression. For most applications, this. Delivering Superior Fuel Efficiency and High Performance With a larger displacement of 941cc for increased power and performance, Suzuki's Lean Control System for improved fuel economy and incorporating designs that are more compact and lighter in weight than the predecessor, the New Generation DF40A offers industry-first features to provide industry. Why do outboard motors of the same power sometimes take different propeller sizes? This is due to differences in lower unit gear ratios. High Output Alternator The 115 TLDI® is equipped with a high output alternator that produces 37 amps of power even at 1,000 rpm and a whopping 40 amps at wide-open throttle. " Date Although Yamaha created a kit to try to correct these problems, it has not issued any technical service bulletins or recalls regarding the motors. Engine Hesitates, Stumbles, Lacks Normal Power The computer uses this information to determine how much fuel is needed to maintain the correct air/fuel mixture, and when extra fuel is needed if the throttle suddenly opens wide. The idle system is the primary fuel system when the throttles are closed and for just off idle, then the intermediate system takes over until the rpm is high enough for air flow in the venturi to. Even acceleration. I can put it at full throttle and it just kind of lugs down. Bring your boating to the top with Suzuki Marine. If only nailing down the causes of power loss were as simple as a tuber in the tailpipe, we wouldn't make such a hash out of diagnosing them. This is a 1991 Mercury 75hp parts layout of the cylinder block:. Check your owner's manual for your particular outboard's schedule, and keep note of when to check on them by watching your hour meter, or by using the Yamaha Outboards app on your smartphone. Engine is hard to start especially after sitting from a run. Went out Sunday and didn't even make it out of the harbour. It has a intermittent problem of a high idle 1200rpm surging of 100 to 200 rpm at cruising speed 3500 rpm and loss of power on take off. The rated power of the outboard should be equal to or less than the rated horse- power capacity of the boat. Each had unique engineering specs, power capabilities and intended uses. This isn't a complete shut down of the engine, but rather something like 80% power loss. This loss of power caused the injector driver to burn out from the "stress". This is usually expressed as a ratio such as 12:21 or 14:28, referring to the number of teeth in. boat, motor and trailer cost is less for an outboard jet giving it the advantage. A downloadable repair manual is a digitally delivered book of instructions that provides step-by-step maintenance, troubleshooting and repair procedures. torque, a concept still not that well understood by petrolheads. Going forward from July 1, 2018, outboard engine manufacturers, importers and distributors will no longer be able to import traditional carby two-stroke outboards, or any other outboard engines that don't meet the new standards. 70hp evinrude idles at high rpm. Other advantages of a gearless motor is greatly lower - even eliminate noise level. maby a small piece of rubber from the gas line from running ethanol gas. The answer is that the outboard motor and propeller you should choose for your S4 depend mainly on two factors, which are - Power. Once read you lose 3% horse power per 1000 feet, which meant almost 30% up there. Outboard Motor. 4kW (40PS) outboard class—with four valves per cylinder, and an air intake system optimized for maximum efficiency in the high rpm range. At the recent international defence exhibition (DSEi) in London, a new lightweight diesel engine was on display from Cox Powertrain developed with Ricardo UK. Outboard motor designs vary depending on make and model, but all operate on similar principles. I'm at a loss as to what the hell is wrong! Now WOT just goes to 4800rpm, and stays there happily. For long periods of time, marine engines function under high loads and rotations per minute (RPMs), which causes automotive oils to break down and lose viscosity or ease of flow. If the servos in the system draw more current, even briefly, please use an outboard power source. Engine fails to run and has no spark. You are invited to join our public Boat Repair Forum to seek Yamaha Outboard Forum; Loss of power/speed at full throttle You'll fry cylinders at high RPM as I. Yamaha Outboard Power Loss Forum Topics 1996 Yamaha 115 Saltwater 2 Stroke S115TXRU no power, loss of RPMs: 7: Vibration and power loss at high rpm 1996 30. Outboard motor won't run under load. The reason the valve bounces is because the spring cannot exert enough load to keep the valve closed. pumped it up and it was good the rest of the day. 70hp evinrude idles at high rpm. A Mercury SmartCraft System instrument package can be purchased for this outboard. Boat ownership is a blessing! C&I take immaculate care of our fishing equipment and, after many years of faithful service, finally turned in the old Merc Force for an offshore competitor, the Suzuki 4-stroke 90 hp. 2000 200hp ox66 yamaha outboard has issue with losing power after getting on plane. DOWNLOAD outboard or inboard marine repair manuals straight to your computer in seconds—fix your problems now. View and Download Mercury 150 operation, maintenance and installation manual online. condition at high RPM that could cause engine damage. At rigging time in early spring, the engine was equipped with a propeller that allowed the engine to turn within its recommended RPM range at full throttle. 90-450 psi of conventional direct injection. The Pro Finish Bravo I OC (Outboard Catamaran) features a total of eight Performance Vent System (PVS) vent holes for fine-tuned performance on high-powered outboard catamarans. The reason I can authoritatively say this is that they will not run at the their rated rpm under any conditions or with any prop (stock prop all the way down to a super high thrust 5. If the boat is performing poorly and the maximum RPM's are normal and what you are used to, you can look to the hull and some of the external parts. We recommend 3-blade propellers for recreational boats with 3, 4, and 6 cylinder outboards and I/O engines. The Verado L6 is an in line 6 cylinder supercharged outboard. Outboard motor won't run under load. As of July 1, 2018, new high polluting outdoor power equipment and marine engines, such as conventional carbureted two-stroke outboard engines, can no longer be imported into Australia. The Travel 801's input power is 800 watts. The optical sensor located on the top is fed power from the power pack and sends crankshaft position, cylinder location and direction of rotation back to the power pack. propeller lose its bite or thrust. I do more mid-range cruising than ass-hauling, so my current motor is a standard version. This is a feature exclusive to the Evinrude E-TEC outboard. Both, scenario one and two is a true indication of a fuel delivery problem. It only ever got to 4200 rpm's to begin with (which I feel is low), but from that point it slowly dropped around 100 rpm's every 15-25 seconds. Some outboard manufacturers do make "high thrust" versions, with a bigger reduction gear ratio. 3: Idle Noise Reduction System - The exhaust gases and the sound are routed through the labyrinth exhaust. Suzuki was the first manufacturer to tighten that pitch spread, to 1. Developed a strange complaint on our 4hp Yamaha OB recently. If the boat is performing poorly and the maximum RPM's are normal and what you are used to, you can look to the hull and some of the external parts. I had to be towed in. Been fishing just taking it easy on it right now and will take her to dealer after first week of August. A vacuum leak on a fuel injected engine will cause high idle. When I try to accelerate from an idle position, my engine refuses to pick up speed. 5 HP 4 HP 6 HP 8 HP 9. Tohatsu outboards were originally developed for commercial Japanese fishermen who needed a motor that could run for days on end, no matter what the weather. Further, the reduced crankcase pressure dramatically reduces windage losses at high RPM. It had been running fine. The Nissan had a standard prop, and the Tohatsu came with a standard prop, but I upgraded to the high thrust prop for the new engine. Outboard motor designs vary depending on make and model, but all operate on similar principles. Mercury Download 2000 2001 Service Manual 75 90 Hp 4 Stroke 75hp 90hp Outboard DOWNLOAD HERE This 2000-2001 Mercury/Mariner Outboard Marine Service Manual/Repair Manual Covers The Following. Losing power (bogging) on Freeway High RPM. is reduced because the engine has less power surplus at each speed level. If the boat is performing poorly and the maximum RPM's are normal and what you are used to, you can look to the hull and some of the external parts. YAMAHA 60 HP 4 STROKE OUTBOARD MOTOR JET DRIVE - When you need to explore the shallow stuff, the F60 Jet Drive (40hp) is the perfect midrange outboard. I ran fine all day Friday. Discussion in 'Outboards' started by ryanonthebeach, Jun 25, 2009. power and throttle response in the low- and mid-rpm ranges. On a hot summer afternoon outboards develop less power and may lose several hundred rpm compared to a cooler day with less humidity. Does engine RPM affect gas mileage? Thread vs high rpm small injection time. A crack in the block can cause a high speed miss when the water pressure gets high, but a normal shutdown will mask the problem. same rpm's as before? in general, you set the boat up. First of all, in most engines, the expected power gains will occur with 8 to 10 inches HG crankcase vacuum. DOWNLOAD 70HP Outboard Repair Manual 38. High RPM / Low speed gain / Engine-Shifting issues? 44 Answers. Loses power after planing Home › Forum › Ask A Member › Mid 80's E/rude V-6 150hp. It feels like it's loosing it's bite and cavatates, but it's not. Re: Boat losing power at higher RPM I agree with bond-o, also check your low oil press sesnor wires, i had the same problem and it was loose wires at high RPM's. 4l no spark engine floods at idle RPM instructions for 1994 mercury 115hp fuel pump problems starting 8. Problems with my Johnson outboard. High tech materials such as solid milled titanium impeller. While running at full speed I began hearing a long beep. (speed limiting operator warning) function that limits the RPMs the engine is capable of attaining. Tilt the outboard up. It occasionally will surge back up after a minor drop in rpm. I recently replaced the 8 hp two stroke Nissan outboard on my Oday 23 with an 8 hp four stroke Tohatsu. In a shop they often use a test prop in a tank, it provides a load but not nearly what you might get on a real boat. Techno's "Know your car" Series # 10 Mazda MX-5. The "high thrust" Yamahas are designed to perform best at high RPMs. The intake valves are open for a longer period of time to produce more power. SPECIFICATIONS. is reduced because the engine has less power surplus at each speed level. You’ve had your boat out for a few trips and lately you have begun noticing a slight power loss in the upper RPM range – above 4000 RPM – yet when you throttle back the engine and cruise at lower engine speed it runs fine. The engine mounted fuel filter. If the Mercury 115 begins losing horsepower and no changes have been made to the body of the boat itself, the problem may be with the propeller. 2018 Yamaha F300 V6 4. Second reason is the age of the impeller. Wooldridge Boats uses stainless steel impellers in most cases. Here's how to choose the right kind of package boat power. l Do not run the motor while the boat is near anyone in the water. Check for water. 4kW (40PS) outboard class—with four valves per cylinder, and an air intake system optimized for maximum efficiency in the high rpm range. However the 6hp tohatsu engines do not in real life put out their rated HP. The engine weight is recorded at 452 lbs. Mercury Download 2000 2001 Service Manual 75 90 Hp 4 Stroke 75hp 90hp Outboard DOWNLOAD HERE This 2000-2001 Mercury/Mariner Outboard Marine Service Manual/Repair Manual Covers The Following. The throttle was wide open and it wouldn't get on plane. To radically simplify. Motor functions fine until high rpms -- then loses power almost totally (goes into limp mode?), but does not shut off. My test 400 Cuddy featured a one-step, deep-V hull form possessing about a 45-degree entry and a 21. OL means something is disconnected. This is a feature exclusive to the Evinrude E-TEC outboard. Are there any rpm limiting features anyone is aware of? I read something about a possible rpm limiter if the oil level is low. Outboards & Trolling motors Suzuki DF60 4 Stroke Losing RPM Sporadically While Running If this is your first visit, be sure to check out the FAQ by clicking the link above. The simplest way is a check on the RPM's first. This design has reduced the overall size of the outboard while providing high performance power. The FishPoint High Mode RPM setting remains adjustable for fine tuning the power requirements for each individual vessel's needs or to match conditions; The FishPoint center mode for quad engines now allows for quieter operation by using the center engines only for thrust and the outer for increased electrical charge output. Once your Yamaha outboard inline fuel filter or the cup filter have separated a certain amount of water or other debris from the fuel system they will become clogged. FOND DU LAC, Wis. If the boat is performing poorly and the maximum RPM's are normal and what you are used to, you can look to the hull and some of the external parts. Outboard motors usually have high RPM's which is fine for go fast planing vessels, but for displacement vessels this is a problem due to a large loss in efficiency with the high RPM's and small diameter. Second time out it started this issue after getting to my second fishing spot. If the load is too large, the rpm is too low and there is great stress on the motor. Previous page: Sizing the Engine Propellers come in various shapes and sizes, as they have to match the engine power and RPMs, the boat displacement and the main type of usage expected (it takes a different propeller to pull a skier fast out of the water, than the one that should efficiently and economically push heavy load). You'll find the need for a fair bit of power to "get over the hump," but once the boat's on plane and you're trimmed properly, you should be able to decrease throttle a little without losing speed. I'm at a loss as to what the hell is wrong! Now WOT just goes to 4800rpm, and stays there happily. Specifications, pictures, and pricing on our New Yamaha F225 V6 4. Guys maybe you can give me a little help before I take this motor into the shop. It uses a lightweight composite lower pan and cowling, a single-ram power trim and tilt mechanism and a lightweight mounting bracket. 5L EFI 200 XRi Merc. 1997 johnson 70 hp outboard motor loses power after running for a while. after running some new. This BEC is capable of supplying up to 5 amps of power. sounds like you may have got something in your high speed jets. Normal maximum RPM = hull problem. DOWNLOAD 70HP Outboard Repair Manual 38. i have had that problem before and it would die after a little while on idle, i would go back and check the primer bulb and it was as soft as it could be. 1 liters, these FourStroke outboards produce power to spare, which leads to improved durability, longer life, greater hole shot, increased overall acceleration and awesome top speed. Offers Outboard Tech Prop & Rigging information across the Outboard range High Horsepower Four Stroke 115 - 425HP. was spun off to other owners, and he went on to success after starting the ELTO company to produce a two-cylinder motor - ELTO stood for Evinrude Light Twin Outboard. [The Yamaha 90-HP two-cycle engine seems to have] no power over 3,000-RPM. This is a feature exclusive to the Evinrude E-TEC outboard. Accompanying this weather-inspired loss of power is a second but more subtle loss. We recommend 3-blade propellers for recreational boats with 3, 4, and 6 cylinder outboards and I/O engines. This high performance engine has a displacement of 941cm3 and features a DOHC powerhead—the only DOHC engine used in the 36. Mercury 150 4 Stroke Outboard. Outboard Spares Response. Another concern relates to the weather conditions during testing. 3 Measure using an accurate service tachometer with engine at normal operating temperature. When in low revs the OB performs fine, but when I rev up it's like the OB goes out of gear and loses power, though the engine screams away. However, in a road/commuter bike, the limited power range is a problem. I'm not a motor guru by any stretch. This design has reduced the overall size of the outboard while providing high performance power. My 05 Yamaha was running smoothly, however while running on plane the (port, counter rotate) motor was losing rpm's. What makes an outboard boat motor surge and not run to its full power? Too high of voltage, bad motor the capacitor is running , or power surge uninterpretable power supply, also acts as a.