So anytime you step on the gas pedal to accelerate your vehicle, the computer sends this information to the sensor so that the throttle knows how much fuel to let flow into the engine. Arcing across the points is a good indication of a bad condenser. Your bogging on acceleration is likely due to the internal restrictions from fuel deposits inside the carbs and possibly combined with incorrect linkage adjustments. Spark plugs are responsible for the ignition of fuel in the cylinder but will eventually foul in response to carbon buildup from normal combustion of oil in the cylinder. When in the water and I throttle up, the engine bogs down and cuts out. Spark plug fouling can be detected by removing the spark plugs and comparing them with a plug color chart. A clogged fuel line inhibits the flow of fuel from the boat's gas tank to the engine. This happens when the TPS gives incorrect information to the ECM. No wisdom bstowers, but my identical motor exhibits similar symptoms. There are several methods to troubleshooting a stalling outboard engine. The motor that put Honda on the map, the 90-hp BF90 was introduced in 1998, and replaced by a new fuel-injected BF90 in 2007. Repairing what you have, or buying a used engine … Problem: Engine Idles Rough and Stalls. Each had unique engineering specs, power capabilities and intended uses. If the ratio of fuel to air becomes too high or too low, the engine will run poorly, especially while accelerating. Motor started fine, idled fine, but when I gave it some gas it wanted to die. The tiniest of leaks can cause engine performance problems. If I power down and try to power up quickly, it bogs down or completely stalls out. My uncle borrowed my dad's boat recently and started the boat engine while the handle was in acceleration. ... 2020 300 Not rated yet When we turn it stalls. Yep, a dirty fuel system would be my guess too. I will start at the beginning. Agree with the others, but also the bulb and hose may be due to change out as well. Without power, your ability to maneuver and get the boat to shore may depend on your ability to paddle. heres the stuff that i use. 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. Cleaned the carbs and replaced my fuel filter. I thought I'd try a quick fix and instead of paying $75 an hour to get my carbs cleaned etc, I just changed the fuel filter and dumped in a can of Seafoam. does it clunk when put in gear? Plenty of fuel in the tank, and there is a new fuel/water separator. New carb kits installed, link and synk, good comp and spark, fuel system ok. Boat Engine Stalls When Accelerating. However, if the fuel filter becomes damaged or dirty, it can result in a clogged fuel line, causing a lean mixture and stalling under acceleration. Maybe I just got lucky, but it runs like new again. Just my luck. Check While Running. Honda outboard motors offer top acceleration … Another possible cause is an air leak in the fuel line. Once the leak is found, replacing the gasket, rubber intake or manifold components responsible for the leak will fix the problem. it has new gas, new filter and the carbs were just cleaned. For background, I bought this motor used a month ago. 5) Acceleration Issues the motor is a 35hp Johnson. A manifold leak is easily detected by a hissing sound coming from the … Why boats break down, and how you can prevent boat problems from happening to you. As a result motors such as the former 10HP Evinrude were then sold a 9.9HP, and the former 18HP Evinrudes were sold as 15HP. I have a 2000 Johnson 70 hp oil injected outboard. ... Any Mercury 9.9 HP outboard engine that won’t start should begin working if … Follow. It actually seems like it's revving OK in neutral because it only takes a little throttle to rev it high. 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