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I don't intend to turn this into an oil thread; that said, the oil used does make a difference in engine temps under certain conditions. With M1-15/50 my bike rarely exceed 200F on the hiway, even in 90+ weather, even in traffic.

I noticed that my bike tends to run a bit warmer in really hot weather with Rotella T6-5/40, & I'm not surprised at that.



Your carbs are ultra dialed in too and jetting (A/F mixture) effects engine temp too. My bike runs about 180º to 190ºF on an average day running the slab or hard in the twisties. On a really hot day in traffic I have seen about 220ºF and even 230ºF when I was stuck in construction at a stand still almost on a scorching hot day, we started to move shortly after. Good thing since I was about to shut the bike off and sit until it cooled off.

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