First time running 21.5 lipo yesterday and I was having a problem with the motor breaking up or stumbling off the corners. I started with the motor timing cranked all the way up. So backed it down some and the problem got better but didnt fix it. anyone having or had this problem?

You might have it overgeared. Had a 17.5 do that to my buddy in a 12th car.

thats a good point, I did gear up.

The one time I had that happening was at my first BRL race couple of years ago. Charlie from Novak was there and I asked him about it. He checked my motor and said there was too much play in the rotor. In the corners the rotor would move to the right and pulled away from the sensors too far. I reshimmed the rotor for about .010 travel and problem went away. Something to check anyway.

I'll check that, thanks

Never thought about the shimming. Might be something to look at. Thanks for the idea!

My 17.5 just did that it was the gtb

Generally speaking, those of you who have specific application questions about Novak products could contact cs@teamnovak.com directly.

I had one do that too, The GTB was my problem.