I took my boat out on the bay last weekend. Nothing strenuous. I noticed that after getting away from the launch the engine temp (according to gauge) jumped up to 180. I cut the motor and looked for something stuck on the RSW intakes on the outdrive but didn't see anything. Put the outdrive back down and slowly motored on. Temp was down around 120, then 160 (where I would expect it), then back to 180... If I would slow down to a crawl the temp would go all the way back down to around 120!?!?!?

I have it on the trailer and I'm going to replace the things on my list to check are impeller and the thermostat. Any other ideas why the temp would vary so dramatically?

Thanks,

Brian