hmf full exhaust on new 07 yfz 450 what jetting to run

Yamaha

What jetting should i run with my new 450 and full exhaust also with or with out air box lid

a james dean jetting kit.........

Forget the jetting kit, it's a rip off.

Go to your dealer and get:

165/168/170/172 main jets

45/48 pilot jets

Then start swapping and playing until you get it right.

If You want LOUD get the HMF Quiet:: racesieries exhaust:

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