It never failed me so far. I don't even have to use any loctite.

I always rough up the flat of the shaft with a grinding wheel on my Dremel and use Blue thread locker on the screw (dried) never had one come loose :mdr:

I'm shocked some have no issues and don't use locktite. I wouldn't stand a chance without locktite. But the locktite will loosen up if your pinion gets super hot. This can happen on mod1 grears if your mesh is out a bit. End of the day, two things that make the biggest difference for me is locktite on the screw and a bit on the shaft dried OVERNIGHT, and most importantly make sure your set screw isn't shiny stainless or smooth silver steel. It needs to be the black oxide finish. The smooth screws just don't grip in the threads.

i never had much of a problem with pinions falling off until today. i got my rc-m motor mount and pinion for my truggy and i managed 2 30 sec. runs. each time, the pinion fell off. also, the teeth are already looking kinda sharp where the pinion and spur made contact. the mesh was good and it is a rc-m pinion. i have had pinions wear away slowly and none that have issues with staying on the shaft.

the rc-m pinion i ordered is decaying very fast. only ~1 min. of runtime and already the teeth are sharp. the only other time this has happened to me is when i used a stainless, non-hardened pinion. it's like my brand new rc-m pinion isn't even the least bit hardened. maybe it's just a fluke?

IDk. I once got a 14T RCM pinion that lasted less than a day. Perhaps they didn't harden properly. Perhaps contact Mike or just bite the bullet on a new one.

I use green locktite onthe shaft and blue on the screws. Green is for shafts & bearings, and it does hold the pinion on very tight.

Yeah, I would definitely contact Mike. Sounds like the heat treatment wasn't done right for whatever reason.

well, i was able to get some runtime in today and the pinion stayed on after using blue loctite, but there were other problems...

http://i581.photobucket.com/albums/s...a/IMG_0003.jpg

the teeth wore even more and a tooth even broke off. i was running in fairly slick grass when it happened and the mesh was fine. i checked every other possible cause and everything was fine except for the gear. the motor mount and motor had no movement or play and everything else was fine. maybe the pinion gear was over-hardened. i sent mike a pm with the picture. hopefully, that will be enough to get a replacement without sending it in.

He should be cool with that- sometimes the pinions get overhardend or underhardened, so he's happy to replace them.

mike still hasn't replied to the pm or the e-mail i sent him. i included the picture of the pinion gear in the pm.

BrianG, can you ask mike if he got my message? my truggy is on hold until i get a new pinion gear and i would like to avoid getting another robinson racing gear. the one i run on my buggy wore out pretty fast and i had to get a plastic spur to stop the wear.

maybe i can switch to a plastic spur after i get a new pinion because it seems that every pinion i've ever owned has worn out when meshed with a steel gear. some last longer than others, but i don't have to worry at all with a plastic spur. the reduced gear noise is also nice:wink:
anyone know of a 45-48t plastic spur that will fit the crt x2 truggy?

Have you tried the Hotbodies pinions? I have a couple and they seem to be holding up quite well :yes:

i'll keep those in mind. they are nice and cheap. hopefully i won't need to get one if mike ever responds to the pm that i sent him...:whistle: