Bought this bike used, the jetting is way off. It pops on decel, hard to kick start, have to have idle way up so it doesn't stall. I am taking the carb out to clean it, change out the jets and install one of those adjustable air/fuel screws.

Was hoping to get a rough idea on what jets I should be using with the following system: FMF powerbomb header, FMF powercore 4 muffler.

The bike has also been de-smogged. Runs pretty good when its warm,although it will sometimes do nothing if you twist the throttle at low rpms. My friend has a klx331 with a pumper carb and it runs smooth and flawless from idle to redline, my 450 does not.

Any help will be appreciated! Let me know what jets youre running with this exhaust setup!