Question about 2003 Yamaha YZ 125

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My yz125 is not starting and keeps backfireing plz help and when it was it boged down and now i have this problem

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Hi buddy yor burning too much fuel on carb there are 2 screws the mixture is the screw you need screw this in 1/2 of turns and try this also replace spark plug br8es and try this bud my yz125 is not starting and keeps backfireing plz - eddec1f.jpg

Posted on Sep 06, 2009


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Bike keeps back fireing when first starting

Hi and welcome to FixYa,

Initially, backfiring is a spark/timing issue or contaminated fuel (water) or as you stated stale fuel. AVGas would not result to backfiring but rather a stronger pull though would heat up easily.

Good luck and Thank you for using FixYa. Happy Holidays.

Pls be informed that due to my current rank and rating, even a Helpful would be detrimental to my status. Should this solution not address your concern, it would be appreciated if you could just not rate it at all. Cheers.

Dec 25, 2008 | 2005 Honda CRF 450 R

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