Anyone use a heated vest? What wattage will our bike support?
Read somewhere (I think it was a review because I can't find it on the Yami website) that it was 380 watts at 5000RPM. Sounds about right, because my WR250R is 350@5000 rpm. Figure maximum for lighting, ignition, and fuel injection is 150 watts, that leaves at least 200 for other equipment. WR250R owners have reported on ADVRider forum that they have no problem with grips, gloves and vests all on.
My choice for 25 to 45F riding is:
Lower - Long thermal underwear, covered by shin and knee armor (protects from wind as well as a fall), then flannel-lined bluejeans, then snowmobile suit.
Upper - Regular or thermal undershirt, heavy flannel shirt, then medium-weight insulated vest (from 25-35F), then snowmobile suit.
Hands - Insulated gloves (Mittens are warmer, but produce a feeling of less control) with electric glove liners. I haven't tried heated grips, but I always found the back of my hands getting colder than my palms, so I expect that grips alone wouldn't help that much. I went for the heated liners rather than the heated gloves so that I could use different gloves if I wanted. Turned out to be a good idea when I slid out on black ice last winter and ruined my outer gloves.
Feet - Long synthetic ski socks above 35 deg., add heavy wool socks below.
Head - Silk balaclava, wool scarf if windy or below 35 deg.
Got the snowmobile suit through an Amazon.com vendor for about $65. Brand-name suits (Ski-doo, etc.) run alot more $$$.
Two last thoughts: Avoid salt-covered roads. Lots of parts on a bike are not protected well from corrosion. One Winter's riding on my WR250R proved this.
Traction on cold pavement with cold tires is much less than Summertime.