Question about 2003 Yamaha WR 250 F
It dies when you pull in the clutch sometimes. It dies when you change down a gear the bike won't start for a few minutes after each time it dies It dies at random times when riding, then clicks back in and takes off with no warning Backfires (probably a seperate problem)
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 bottom 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. 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. Remove the idle screw on the outside throat of the carb and the air screw on the back left of the carb bore as seen from the filter. Spray into the screw holes as well.
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Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. 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.
The carb has a diaphragm fuel primer pump Each time the throttle is cracked open the pump give a shot of gas. This is fine for take off but downshifting can create a rich mix. A rich mix promotes backfire. Just don't crack the throttle.
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Posted on Jun 18, 2009
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Posted on Jan 02, 2017
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