John, argue as you wish but those of us with many years of Raptor experience under our belts will agree that his issue is carb related, not valve.
Always a good idea to check valve clearance, twayne - the 660 intakes tend to close up as they wear, eventually causing a loss of compression and a no cold start situation - and no carb adjustment can make it run at all. Your bike starts cold and idles - it wouldn't with valve issues.
TWayne - put your air cleaner in and airbox lid back on. The bike will run VERY poorly under load, above idle without them, since it is jetted for a closed airbox. Rebuild kits only come with stock sized jets - smaller one goes in left carb. Also make sure the emulsion tubes didn't get flipped upside down - the chamfered edge faces up towards the needle.
Also, as Dez mentioned, the cheap Ebay kits often have poorly made, incorrectly sized jets that just don't work for crap! If you have the originals I'd clean them and re-use them... they don't wear out, theu just get dirty; else I'd suggest buying new Mikuni replacements.
'01 660 Raptor, Burgard +2+1 arms, YFZ Shocks, LSR anti-vibe, CTR pipe, jetted, K&N
'01 Polaris Scrambler 400, K&N
'02 Honda 400ex, Big Gun pipe, jetted, K&N, Lonestar +2 A-arms, Lonestar anti-vibe
'04 Suzuki LTZ400
'16 RZR XP4 1000 Turbo
Last edited by QuadManiac; 05-09-2019 at 12:17 AM.