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Well I would say that heating it up is not a good idea at all.

The amount of heat generated from a propane torch to get a brass pinion glowing red would exceed the recommended maxium amount the internals of the motor and brushes could handle.

You can go to a slot car shop and get a pinion puller for about $8 usd.
They work great.

You can use a 2" C-Clamp from Home Depot to press them on with.

I cut the swivel foot off and drilled a recessed/concave area with a large drill bit in the stationary side and a air 90* angled drill.

Ive done the propane torch thing at least 12 times and there have been ZERO problems with it. Of course I have the backshell off of the engine before I blow torch it.

cool....
 

Well I was no trying to be jerk, just saying.

Better with the back of the motor off though. Probably fine, just saying that kind of heat is enough to change tempers of metal and might weaken the mags.

I just like to be careful thats all cause there is that chance, which I work on cars and I once heated a downpipe end so hot it glowed red and white because it was stuck and I killed the cat converter after getting it back together and driving it.
I mean you can tell me to shut up because I am probaly over reacting. Thats fine, was just my $.02 warning, thats all.:D

There has to be skeptics, that is what makes us all stand back and think about things. Believe me, I didnt think it was a good idea either, till I tried it! And the pinion literally falls off.

Install idea was great Thanks
 

2" C clamp from home depot to install a pinion THANKS I've been using the heat with a torch and hit it with a hammer method " and I've wreak a few motor's " So thanks for the idea !!!

Re: Install idea was great Thanks
 

Hey no problem, or you can use whatever C clamp works best,but I think it was the 2" I bought and use(the ones at the slot car are pretty mucha c-clamp anyhow). It will also work without cutting the swivel foot off. But when you use this on the 180's, be careful not to get to crazy cause it will try to push the shaft through the rear bushing cap. It never harmed a motor, the most it did once was put a little dimple/bump in the back where the shaft pressed, because the shaft does have some foward and back play.