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Hi every one. 2006 trx450er { stock pipe , jets, and open air box with aftermaket filter } On a resent post I had said " having trouble with backfire on decell " and I was advised to just put the air box lid back on. But I got this bike with out lid. anyways long story short I got 1 on ebay but bike wont start with it on, I took off and bike starts right up. With bike "on" I put the lid on and instantly bike tries to die. any ideas???
 

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The carb has been rejetted so the engine run without the lid - while the back fire may be annoying, it is not hurting anything - all you need to do is; 1) increase the exhaust back pressure (more restrictive exhaust) - 2) enrich the fuel mixture at the closed throttle setting - 3) set the idle speed higher.

Otherwise, reverse all the modifications made to make it run without the air box lid on - I'm sure the previous owner documented all the modifications so a subsequent owner would have knowledge of the extent of modification and have a base line to work from should changes need to be made for altitude, fuel quality and type of competition the engine would be subjected to.
 
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