Actually, there is no “correct” temperature because of the many variables like weather, track type and length, etc. What we would recommend is tuning to get a proper light tan spark plug color and note the CHT.

This way if the engine is rich or lean you just tune the carburetor to bring the temperature up or down a few degrees to fine tune it. Typically the longer you are on the throttle the hotter the engine will run so if you are running on a small oval or sprint track, where you are on and off the throttle, you will see readings in the low to mid 300 deg range where if you were at a track like the Milwaukee Mile where you didn't lift, readings in excess of 400 deg wouldn’t be a surprise.

Also, the practice of taping off the flywheel screen to increase engine temperature is not recommended since the Yamaha , like other air cooled engines, needs to run as cool as possible. That is because the elevated temperatures tends to weaken and distort components like the block and head, which could cause the engine to "fade" or be down on power..

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