Jetting help?? YZ426F

OK I have a stock 2002 YZ426F that I'm setting up for Sumo racing. Stock airfilter, and box, Stock pipe but it has a pro motion billet spark arrestor. I live in Michigan like 600-700ft alt. Are these bikes factory lean like the rest? I don't have any issues right now it seems to start and run fine, just fishing for opinions...........or the hot set up :thumbsup:

Repost on the jetting forum, might get an answer there. Seems as if it starts and runs well, why mess with it. Fix what is broke.

BK mod is helpful on the 02 426.

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