2006 wr 450 jetting

if i can get some input it would be great.a customer of ours wants us to install a pro moto billet silent insert in the exhaust and install the GYTR jet/desmog kit at the same time hoping to make the bike run better ,faster and all.the gytr kit has specific instructions but it does not mention the mainjet.i suppose the yamaha kit is for the stock muffler.do you think the mainjet should be changed to compensate for this PMB insert? ps. we are in northern CA ,most people around here ride at sea level up to about 4000 feet.thanx,dan

Yes, you will most likely need to richen things up. Check the database, it has lots of good info.

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