jetting for zero

[ogre03]

My bike ran great at around 65-70 deg. this summer, before I had to replace the top end. Now being that I'm in alaska it's about zero, maybe less. And I'm about to put it back together again. What is a good starting point for finding my jetting? I have t6's and a single large foam air filter with no box, and I'm at about 450-500 ft. elevation. Also, are there any bad side effects to running a shee in such cold weather? I know there are a lot of two stroke snowmobiles so it has to be possible. Thanks for the help.

Edited November 3, 2005 by ogre03

[odaen]

for colder air, I think you need to richen your jetting. I dunno how much, because I've never delt with that extreme of temp change.

[2003LimitedBanshee]

My best guess would be 3 (or maybe more) sizes bigger than you were running at 65-70 degrees. Did you have to do the topend becuase you leaned it out?? If so I would go 4+ sizes. I personally don't know of any side effects of that cold of temps, because I don't have the gumption to ride in those elements (although you don't have a choice in Alaska). But I do know I've heard of guys racing Banshees on frozen lakes, so it must be doable, but maybe they take special precautions.

[ogre03]

I'll go ahead and try the +4, it's only going to get colder around here. Do I need to mess with anything other than just the main jets?

[Pest]

I would richen the pilot and clip postion as well, get it fat them lean it down from there.