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I've been using 89 octane just as a precaution against detonation. I haven't experienced any yet. I don't notice any particularly excessive heat coming off the engine, but it's been pretty cool here lately. Before installing my oil cooler I did notice the clutch freeplay increased after a few miles on a pretty steep grade running the bike close to maxed out. I've since run that same grade under similar conditions and didn't notice much change in the clutch freeplay at all. I've got to assume that if the oil's running cooler, it's helping to cool the engine as well. Particularly because the cooled oil returns back to the valve cover and sprays down onto the rockers and the top of the head with the cooler setup I'm using, I'd think it would help with the temperature of the top end as well. I'm not going to go to any great lengths to quantify the relationship between oil temp and cylinder head temp though. My seat of the pants impression is that the cooler does help significantly.
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-2024 CSC TT250, stage 3 motocult kit, Nibbi PE28FL with custom-made cable controlled choke, modified stock muffler (larger diameter tailpipe), custom oil cooler installation with relocated stock evaporative emissions canister, oversized stainless steel footpegs, IMS folding tip shifter, a few little blingy bolts and bits. More personal preference mods to come.
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