@CYBER-NINJA An ally rad would make a huge difference. The Lanza rad, like the DT200R Rad, has a tiny capacity. I'm sure it ran very hot. But then the DT never had a digital temperature gauge to compare it to. The RE's Simply have a light that goes on when the engine is too hot.
I like 34:1 or 32:1 if your romping it, it's a shame the gear ratios are so short on a YZ. If you keep it fuelled on the over run, just a blip or 2, you can expect no issues, provided the engine has the correct fuelling mixture!
These engines are awesome, and can withstand abuse, just got to keep it setup correctly.