Well, this is irritating. I switched out my bk 9920 for a quark 125 due to cogging from the bk. I also had to put my 8xl in since the 9xl took a dump. I'm currently geared 13/52 and I can run for about 5 minutes before the quark thermals. the motor is getting hot as well, but not much more than expected with a feigao. The ESC however, is roasting. I'm not sure the actual temp, but hot enough to shut it down.

I can't find anything binding in the drivetrain, and I can't really gear much lower than 13/52. I think moving to a smaller spur would be a bad idea.

I also have a problem with the spur skipping when I brake. It's fine in accelleration, but when braking, it will make a nice sound like the teeth on the spur are slipping against the pinion. I find the only plastic spur that works is kyosho ? I think there's nothing bigger than 46t in that, right ?

I really like the truck, but it seems I have a few bugs to work out.


J.