Originally Posted by KevXR
Colder air = denser air. More power for the motor if it's jetted properly.
What motor are you using?
I have a Flying Horse 48cc slant head I bought through Zoom Bicycles. I cleaned up the intake manifold a little and rejetted to a 68, from a 70. I'm running a 40T sprocket. The spark plug is a NGK BP6HS. I'm using Red Line 2 stroke oil @ 50:1. My exhaust is custom, but differs only slightly from stock in both construction and performance.
Everything else about the motor is stock.