I have a 2001 Yamaha XL700Z Waverunner. The compression on both cylinders is about 120, it starts and runs fine - dry. Won't quite idle, but I can start it and rev it up fine (for a short period, of course). However, as soon as it gets in the water, it will barely run - it will start and sputter and you cannot get it to run more than a few seconds or rev up. Take it back out, let it dry, starts & revs fine. It is not getting any water in the casing that I can tell, its almost as if water is getting something wet through the cooling system that I cannot see?

SOURCE: I have a Yamaha Riva 50cc. It starts and idles but

Remove and clean the carburetor. That will probably fix the problem.

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SOURCE: yamaha dt 200 won't rev off idle

You should measure the combustion ratio.Maybe piston rings failed.

mike

• 112 Answers
• Posted on Jun 11, 2009

SOURCE: engine won't keep running

if it runs on starting fluid then stalls then its not getting gas. try cleaning all of the carb jets.

SOURCE: yamaha blaster runs but wont rev

ALWAYS have a fire extinguisher on hand when working on carburetors.
Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Before putting the slide back in the throat of the carb, move the clip on the jet needle one notch lower. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.

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SOURCE: 2006 yamaha waverunner wont idle

what is it idle at? how much? remove your seat check air filter if is black oily remove it and see if that fixes your problem you may want to change your spark plugs as well # one cylinder may be starting to foul the new yamahas are the worst for fouling plugs use a cr8eb instead of the cr9eb the 8s are hotter and work better try those and let me know thank you