by 450xdirt » Thu Mar 26, 2009 8:07 pm
Well you are getting air in and air out, but you need to get more fuel in, that is where the jetting kit comes in. You have a couple options:
1. NCVS needle with larger main jet (165-170)
-Honda dealer
2. JD jet kit includes two needles Hot(red) and cold(Blue) and i think 5 main jets varining in sizes up to 170. This kit also gives great step by step directions. -JD Jetting
Both set ups are good and will do a great job of getting more fuel into your engine.
Also removing the backfire screen helps a lot to get more air in. Twin air makes a great kit.
Hope this helps.