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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?
 

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If you have a 22 year old WR500 that is still running at all with the original 2 stroke engine, you should call Guinness Book of Records and have your name submitted. I'd say you are overdue for a top end, if not a complete engine rebuild. Have you checked the compression?..........that will give you a good idea of where to go next. Good compression = work on the carb, Bad compression = rebuild engine.

Looking for rebuild parts, here is one option: Model: Wave Runner 500 -- SBT Jetski Engines, Parts & Accessories:
 
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