Rotax Mini Max Optimal engine operating temp

Rotax recommend an ideal operating temp for the 125 evo for the mini max class of 57 deg celsius yet myself and others find find best top speed and lap times to be between 85 to 90 degrees . Anyone got any thoughts why that would be?

It depends on the track. With the new 2020 Mini Max kit I have found running around 150-160 F to be the best if the track has any slow corners. If it’s all top end, hotter will be faster. Micro and Mini run better hotter than typical water cooled 2-strokes, I believe anyway, because of the straight pipe with no expansion chamber.

Thanks. What would your bottom revs be through a slow corner, about 5000 to 6000 ?

Yes, right about there, 5 to 6000