Question about 2003 Yamaha YZ 250
Yamaha blaster runs at idle but wont rev or excellerate
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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Posted on Jun 21, 2009
Did you possibly put throttle valve body on carb in backwards? if put in wrong it will idle but no excelleration. uncsrew and turn 180* then try again. it should go in and screw on easy with no forcing it down.
Posted on Nov 22, 2014
Yamaha dt200r starts for a second then dies what could cause this
Posted on May 20, 2014
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Posted on Jan 02, 2017
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