So i picked up this old yamaha last summer changed the impellor and and got it running. But it has some idling problems and it doesnt want to start after it has ran for a while. It will go about 30 mph but it has no acceleration and it is not cavataiting water. It seams like the engine is really tired. Im a 4 Stroke guy with a 2 Stroke. What do you gurus think i should start with reeds, carbs, rings, or pistons?