Originally Posted by
jspurgin
What would be a proper gearing for an 8.5 motor?
On the stock 81 spur, if you have a decent straight on your track, start at about a 22 or 23 and check temps after 5 minutes, etc. I've been running 81/22 on my 7.5 for a while now, and my motor temps are completely fine, even after 10-15 minute practice runs.