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Message: [QUOTE="reepicheep, post: 1380835, member: 104942"] Stock is really rich on my 200, I don't know what stock is on the 220. Those are the jets I am currently running on a friends 220 I am helping him tune. Overly rich is the safest, sort of. It'll spooge everything up, make less power, and foul plugs... but keep the bike from melting cylinders. I've wrenched a lot of things, but this is my first dirt bike, and without a 4 gas analyzer dyno (which I sure as heck don't have) I am guessing at jetting. At about 800 feet above sea level, and about 30 degrees F, a 45 and 142 seems to be running well. That will "richen up" as the temperature goes up to normal summer riding temps, near as I can figure the mains can change by as much as 4 numbers between summer and winter riding. So I tried to get it spot on at 30 degrees, and I'll let it run a little richer as it gets hotter outside. [/QUOTE]