I checked out Nyrocs web page and was wondering one other thing. Do any of you rejet for cold weather. I mean from -10 to -30 C (I can't see riding much in -30, but it happens) I'm wondering if I can get away with 150/155 (or will this be too rich)jets at 900ft with intake mods and 8 1/2 inch holes in the exhaust. What do you think.

 

You definitly wont be to rich. Actually for the conditions you describe you should be looking for lean conditions with those main jets.