I will continue to ride it to make sure it is a problem. 150 just seems very low to me. That's colder than most outboards run at. The thermosat kit I like the most is the thermo-bob and it has a 175 thermosat that I think is perfect. Maybe these bike are designed to run cold, but any engine I've ever seen is best off 180+, and no worries until about 220-230. Coolant shouldn't boil until 250 or so.
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