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Well the pin fits snug in the gear. But it's starting to get oblong in the hole on the driveshaft. So that's why I ordered new shaft and metal gear. The motor is a lot more powerful than the stock one. But it's all steel driveshaft... Didn't think I would have this problem. So hopefully metal...

This doesn't have a slipper clutch. It's a spur gear and pinion gear only on steel driveshaft with a pin holding the spur gear into place. Where the pin holds into place it keeps destroying my spur gear. It's just spinning the pin right thru them. I did just order new driveshaft and metal spur...

Well I did have a surpass hobby f540 which is 4370kv. And it did it with a 2s or 3s. Now I just switched over to an onyx 4000kv.

My hot rod keeps spinning the the plastic gear on the drive shaft. It all falls in place when I repair and put new gear on. And then I'll run it and it spins where the little holder pin goes. It's ruined 4 now. What am I doing wrong or what is going on??? Any ideas will help!