Question about Yamaha YZ 250 Motorcycles
Hi, Mat and the usual suspects are:
1. Damaged or restricted fuel tank venting system.
2. Loose float bowl screws.
3. Damaged float bowl o-ring.
4. improper fuel level in the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
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Posted on May 01, 2017
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Posted on Jan 02, 2017
Doubtful. Clean the bolts and re-mount but I doubt that'll fix your problem. Check spark with an in-line spark checker. Be sure you have the right oil/gas mix...or you will burn it up. How did you check compression, what is the reading? Anything less than 100 means the piston ring is stuck.
Posted on Sep 05, 2009
change the pkug first buy a br8eg plug off ebay and see how this goes get back to me also are you using the choke on start up
Posted on Sep 29, 2009
The float needle valve has probably stuck in the closed position, probably caused by fuel gum. Worst case scenario is to take the carb off and clean it. Easiest scenario is to remove the fuel line and squirt carb cleaner into the valve area. Leave it overnight. Sometimes carb cleaner and tapping the carb will move it. Low pressure air can help. Once it's clear add some injector / carb cleaner to a tank of fresh fuel ( double or tripple the normal doseage won't hurt.)
Posted on Mar 23, 2010
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