Because I have a 540C version, I can, and it's easier.

I wonder if it would be a good idea to put a flat spot on both sides of the shaft to make it balanced?

Like said in a previous post, the set screw in the pinion makes it a bit unbalanced as it is. Grinding a flat spot on the shaft helps negate this imbalance as long as it only as long/deep as it needs to be. Truthfully, I really never gave it much thought before. Of course, if I was eating spurs/pinions, I probably would look closer at this.

ya.. sounds like it really isn't that big of an issue cause im guessing becuase of the small scale and misc. other factors. Coming from just having built a Honda engine to hold 500+ hp i guess i can be a little paranoid about tolerances.

ps.. no more slip with notch "buzzed" in

[QUOTE=BrianG]Like said in a previous post, the set screw in the pinion makes it a bit unbalanced as it is. QUOTE]


Have you balanced a pinion? I was thinking that the set screw might actually be lighter, It has a hole in it, and is pushed toward the center. Course, different pinion/set screw types might change this too. Just wondering...

Just got a MMM 2650 combo, wanted the 2200 but hobbywarehouse shipped the 2650, anyways its in my E-revo with a 54t spur. The motors shaft already has a flat spot and I have the set screw as tight as I can get it, however after driving the truck for a little while the pinion gear slides forwards and starts to chew up the spur, is there anyway for me to set the pinion in better so it doesn't slide forward?

Are you using threadlock on the set screw? You could try filing down the end of the set screw a bit so it has a larger contact area with the motor shaft.

Make a crater
 

Nothing works for me except a 'divet'. Make a small flat spot, if no flat spot already. Then use the tip of a stone dremel thingy (This will wear it out after a few of these) to put a crater just a little bit bigger around than the set screw. Then use threadlock. The set screws balance should be ofset by the flat spot. Make sure to place the 'crater' in the right spot, or youll have to make another on the other side. I have a 5 cell (lipo) brushless losi 8ight from 2006 all custom. this works!!! Good Luck

The cup on the bottom of the set screws typically used on pinions has sharp edges. Over time (tightening and loosening the set screws) these edges can wear out so they no longer "bite" into the motor shaft. A new set screw is often a worthy fix, and threadlock is always a must.

Thanks guys, BTW Bliporacer the set screw is brand new Just got the motor, pinion, set screw yesterday, but I'll see about getting some blue thread lock, would it work just to mark the area where i want the pinion on the shaft then take a file and file down a small spot or at least to give it some more bite area?

you need red threadlock:whistle::lol:

Ehh just weld it on there...

All I use is blue and I've never had a problem! Don't expect it toi hold 5 minutes after you put it on though! I use blue loktite exclusively, red is for permanent lock, nothing RC is pemanent, I always change things up and the red can sometimes be tougher than the hexes!