Questions on heat

[RC-Monster Mike]

Daf,
Your gearing is fine. You may even gear up if you only run in first gear or gear down and only run in second gear. You may even get cooler temps if you run a slightly lower gear in second only. Your motor may have too little resistance in 1st gear with that gearing. If you went to a 72 spur, you would only loose a couple mph off the top end, but you could put down faster laps without shifting. Dropping to a 15 pinion would be almost the same thing.