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.

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