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Old 02-12-2018, 09:51 PM   #47
yearby
FF.Com.Au Hardcore
 
Join Date: Jun 2010
Posts: 700
Default Re: 250 crossflow flat spot

Quote:
Originally Posted by Topsy11 View Post
How do I check the accelerator pump. If it's not running and I press the pedal fuel squirts into the carby.

Yes that is correct

So u think not enough fuel pumping I and.its to lean?

Maybe?

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It could be what Officemanager suggested.

"Missing pvc valve could be your backfire problem as it will upset your engine vacuum, this can cause leaner fuel/air mixture ratio making it more volatile resulting in backfiring."

Completely block off your PVC and try running the engine again and see if it reduces the back fire.
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