Join Date: Dec 2010
Thanked 51 Times in 51 Posts
Sled: 1973 puma, 1978 el tigre,1990 Wildcat
07-08 Mileage: no trail riders
ATV: 1999 4X4 500cc 315 miles on it
2007 Mileage: No trail rider.
Anyways I do know you don't want to jet way lean thats rolling the dice[/QUOTE] Jetting lean accordingly. If your jetting anything, you read your plugs. If your running a snowmobile with factory jetting, your running rich even in sub zero temps, the factory does that so the regular Joe won't burn it up. If your going to run in 30+ temps, you need to lean it down or it will run like a pooch. I race, and even a 10 degree temp change requires rejetting. A trail rider doesn't need to get that finicky, but a 30 degree difference will improve engine performance with jetting. As a side note, back in the 60's and 70's to present, i don't recall any free air's blowing up or melting pistons for no reason. Running too lean, an air intake leak, not the right oil/gas mixture, gaskets, can all contribute to a melt down. That's why you read your plugs. To cut down on heat, because the whole exhaust is in front of the engine, wrap the exhaust with heat wrap. It will cut the heat under the hood over 50%.