I have a yfz with a sparks exhaust, cam mod, 13:1 piston, K&N air filter. I Currently am running a 172 main, gyt-r needle on 4th clip, 45 pilot, and 3 turns out on the air screw. I rode up in the mountains last weekend and went clear up to 9500ft and it still did not miss a beat, the thing never sputtered on top end. My question is do you think I can still go up on the main or should I just leave it alone.

 

Do any plug checks lately? They tell ya alot. I personally hate jetting hehe.

 

If your not having any problems I wouldn't touch it, finding that sweet spot is a pain in the a$$.

 

check the plug, most likely you should stay where you are

 

Where'd you get the K&N?

selector