I would get a cylinder temperature monitor. Air cooled motors do run hitter than water cooled bikes. With a temperature reference you can have some feedback about how long and hard you can push the bike.
In my experience they can hang at highway speeds ok until you meet a hill or a stiff head wind. That's when the temperatures climb crazy high and you need to back off to avoid damaging the motor.
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1993 CR125 powered by Zongshen 223cc OHC
2̶0̶1̶6̶ ̶L̶X̶R̶ ̶2̶5̶0̶ ̶E̶F̶I̶ ̶ Sold
2018 GPX Moto FSE250R
1993 Fantic Key-Roo 250
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