OEM Swivel Bracket (1986 to 1995) Suzuki [outboard2stroke] Outboard DT 140 / 1990

In addition to the general issue of a Yamaha outboard not reaching full RPM, 2-stroke outboards may experience specific problems that result in power loss at full throttle. Common causes for this issue include: Incorrect Fuel Mixture: 2-stroke engines require a specific fuel-to-oil mixture. Using an improper ratio can lead to inadequate.. Overheating can cause 2 stroke outboard motors not to reach full RPM. When a two-stroke outboard motor is running, combustion is always actively taking place in the combustion chamber. This creates a lot of heat in the process. Without properly regulating this heat generated in the engine during combustion, the outboard motor can be easily damaged.

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2. Wrong Propeller. Another probable reason your boat doesn’t go over 3000 rpm under load is that it has the wrong propeller. The right propeller size should be used in a boat. If it’s the wrong propeller size, the engine’s rpm will be affected. There is a relation between the propeller size and the rpm of the engine of the boat.. Its a 96 40hp 2 stroke. I believe the rpm range should be between 4500 & 5500? Ideally I would like to be around 5k. Right now its maxing out at 3900. This engine is on a 18ft sweetwater pontoon boat. The boat itself is pretty light. It has a current prop of 10 5/8 x 12 which looks to be an oem Yamaha prop. At first I was thinking the prop was.