[MetroMPG]

Why not try it out? Rig up a pair of 100 watt light bulbs or something. Nestle it in some insulation and duct tape it to the block for an hour or so. (I say use a pair because the heat xfer will be poor compared to a direct contact.)

I think you'll notice the difference in the way the bike runs, shifts & coasts if you pre-heat the motor/tranny.