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Old 01-21-2015, 11:46 PM
Slogger Slogger is offline
Motorized Bicycle Elite Member
Join Date: Sep 2014
Location: nohio
Posts: 499
Default Re: Small Engines cold air and Performace.

I agree with Dave. There is a big difference in air density and jetting, but another reason is that the engine takes twice as long to get up to full operating temperature. Clearances change, rings tighten up, grease softens a bit as the engine warms up. Since it takes longer and the rides are shorter (BRrrrrr!) the engine never really gets to full output.
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