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Discussion Starter · #1 ·
Im new to the forum and need dome help, i own a 2013 trx450r, I went from a factory 13 front sprocket to a 14 and clocked my top speed ay about 76-78, I have now installed a high flow air filter, pre filter, dynojet jet kit (128 main), and a hmf slip on exhaust and clocked my top speed again at only 74, I can feel as major difference out the holeon tge low end but ehy did I lose top speed, do I need to go up on the jet or what? Also I wanted to do a airbox lid delete but when I take it off my trx boggs out when I hit WOT
 

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You must have a TRX450ER?
Go down to a 12 on the front and check your top speed - you want to get the engine to bump into the rev limiter just as you top out
Take the lid off and change the main jet to maybe a 140
 
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