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Message: [QUOTE="ggr3, post: 1091632, member: 65515"] So even after you when to a 162 main, the only way your got your plug looking correct was by adjusting air/fuel and needle clip position? I ask because I have an 04 KXF250 that I've been having the same problem with. I made quite a few changes to the bike over a short period of time, three of which could be some or part of the culprit. 1. Changed from stock to Dr.D exhaust system. 2. Removed flash screen from air cleaner box. 3. Installed a Boysen Acellerator Pump (going 1/2 turn richer on air/mixture per Boysen instructions.) I knew I'd be having a adjustment just from removing the flash screen as it now get's all the air it wants. Stock is 172 with a 40 pilot and clip in middle on needle, I was at 178 with stock piolot and needle clip position before making the changes, and now I'm at 190 with a 42 pilot and clip down (richer) 1 notch and plug still looks white and lean. Last weekend out at the track I went to a 192 main and it started to burble, sputter and pop. I knew I had gone to rich on the main, but the plug still looks white. Your story makes me want to go richer on air/fuel mixture and drop another notch on the needle to see if I get the same results. Thanks for the posts and followup! [/QUOTE]