I ♥ Cute Cats!
Join Date: May 2008
Location: Ames, Iowa ---- 2008 Hondar CBARrr600ArrArr 2008 Kawk 250r ----------- 2007 Triumph Daytona 675
Aye. I agree with Sev. Read the jetting database for good jetting baselines. STOCK, the jetting is pretty spot on in 90% of applications. The mid-load range can usually use some improvement so search for "Needle shimming" for a low cost way to fatten up that load condition.
And changing air filters has way less of an effect that most supplier boast. Until you radically open up your exhaust, remove your air box, do any decent intake modification, etc. you probably won't benefit from any jetting changes.