Jetting a 220

[The Axman]

I have a stock 2001 KDX 220. I am slowly adding mods to the engine. So far I have replaced the piston (one horror story of a skirt separating was enough for me). I also purchased boysen power reeds and I want to modify the airbox lid. I currently am running a 145 main, 42 Pilot and R1173L in the 3rd clip position. I ride at about 1000 feet and the temp is about 70-80 degrees. I haven't actually installed the reeds yet do to the effects on jetting. What would a good starting point be for jets, clip position?

Also, the manual states to use a BR8ES but it seems a lot of you guys use a 7. We ride mostly 2nd, 3rd and 4th woods type stuff. Every now and then I've been seen screaming down an abandoned railroad bed in 6th :p . Would I benefit in switching to the 7?

Thanks for all your help.

 

[Crisp]

It never hurts to try the 7. But maybe it will? If you switch, let us know the performance outcome. Since summer temperatures are here and the stock jetting is rich I would go leaner with your jetting. Then again it wouldn't hurt to chop the beast and see what you come up with.