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Only runs good with Air box cover removed any reasons why?


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Assuming the info here you mean stock carbs? Stock exhaust?

 

Now you have taken the lid off?

 

As stm tpr said adjust screws and you may want to go up a jet size or 2 given you are now feeding more air through the filter and now down the small intake track of the snorkel.

 

dont talk to morons you only educate them..

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You're still moving more air with the snorkel out.  Check jetting and get rid of TORS.

 

If you rebuilt the top end, did you do a leak down test?  If not, I'd do that before you cranked it again.

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