Colorado jetting



2006 450 EXC with FCR-MX 39 carb, FMF Q4 slip on, new 540 top end.  Gets trail ridden from CO front range to mountain passes to Junction.


What is correct jetting? 


Thank you,


Can anyone help me with this?  I've jetted it four times already and am completely frustrated!!!

We would need to know what jetting you have and what symtoms you have to help you.

You should be able to get by with

165 main

stock needle 3rd clip

45 pilot

45 leak jet

80 power jet


adjust fuel screw for max idle starting with lowest idle screw position possible.

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