i was wondering what jet i should be running for the winter months?? i am now running a 160 main jet at 0-200 elevation and 70-90 degrees. for the winter the elevation will be the same but -10 to 45 degrees. i was thinking like a 180??

 

I would probably try a 170 first, along with turning in the airscrew 1/4-1/2 turn. That's taking for granted that you're presently running a nice cocoa brown on your sparkplug now.