Comments by "SmallSpoonBrigade" (@SmallSpoonBrigade) on "" video.

Ideally, you'd start riding as soon as you can, but I've got to let mine sit for a short bit typically as it isn't fuel injected and keeping it from stalling is a bit of an issue if it doesn't have a short bit to warm up like that. But, in general, it's best to warm up the bike by gently riding it before doing anything too strenuous.
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That's not surprising, the sensor likely doesn't account for the metal around the coolant system to warm up when taking the reading. My mother's car does the same thing where you can't trust its estimate of the outside temperature until the engine has warmed up.
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