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Discussion Starter · #1 ·
I Wouldnt consider myself a new rider. But I have only been in the "big bike" scene for about a year. I have a 2004 YZ250F that everytime I decelrate it will backfire a few times. I got the carb rebuilt and everything. I dont know if thats just how the bike is or what. Help me please.
 

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Retired twice: Navy and as a govt contractor
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What exhaust do you have on it?
 

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American Legion Rider Staff Administrator
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Make there are no possible air leaks. Check every connection and header.
 

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Check to see that the timing chain is tensioned properly, your mixture screw is adjusted right and there are no air leaks in the exhaust system.

Have you modified the stock air box? When you do the carb will tend to run lean and this can cause the popping as well. If the timing chain is loose when you let off the throttle (or get on it for that matter) if can throw the valve timing off just a little causing some pops too. Just a couple things to check.
 
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