I am having problems keeping my engine temp over 140 this winter and it takes a long time to warm up. I do all the things like blocking part of the cooler and stuff but was thinking why not use a thermostat. Rotax does not seem to sell the motor with a thermostat yet provide one if you want it, and I have read that it's not a good idea. What do you guys do and use? Has anyone had issues with using a thermostat?