You start the bike and put your hand on the rear cylinder you can feel the heat build up. When the head gets warm to the touch you can go.
Take the long way to work as much as possible to get the motor good and warm. The short rout doesn't get the motor hot enough and condensation can form in the motor.
Back in the early years Vic's had a bigger oil cooler and Vic found out that the motors would not get warm enough and they had problems.
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