Bikeguy Joe
Godfather of Motorized Bicycles
How about making a crude heat transfer duct from aluminum foil? Make it go from the cylinder to the carb, just wrap some around it all?
That way you could remove it as easily as you installed it once warmer weather comes.
That way you could remove it as easily as you installed it once warmer weather comes.

SIMPLE FIX AND MAYBE BETTER FOR THE MOTOR. HIS CHINA GIRL MITE BE SHIVERING!! IT MITE HELP THE FUEL IN THE CRANKCASE, BY BEING WARMER. JOE, THAT IS A GREAT SIMPLE IDEA. A FEW LAYERS OF BBQ GRILL TYPE FOIL !!?? 