Mt. Max 600 jetting question... need some answers!

[FCatSnoPro]

Hey guys, i just purchased a used '01 Yamy Mt Max 600 and I'm wondering what main jets you guys are running in the 600cc. I'm running one size over stock (can't remember the jet#) and yesterday I was running the sled on the lake (sea level @ 10-15 degrees temps) and my plugs were very white, way to lean. the only mods to the sled is a SnoStuff can. Do I really need to go much higher with jet sizing or what. I would have thought that the jetting would have been fine but the moter is to lean. Any advice is greatly apprec. Thanks.

 

[shortman]

Jetting

Stock setting at sea level is 330-1600ft.
Main Jet 136.3
Pilot jet 42.5
Jet needle/clip #3

If that is where it is at I Would go up to a 138.8 or 140.0 main