Motor Pinion Tolerance?

[Mr Monkey Nuts]

I think my motor pinion may be FUBAR. Its circumference is 1mm less than a motor that is known to work well. Could just 1mm be enough to cause it to be scrap? 

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[Sitting Duck]

Totally different pinions too

Some are cut at different angles like your two

Some are cut a little concave/convex whatever it is called

End of day replace a D pinion is easy enough

O pinion you need puller tbh

Replace pinion if you can or feel it's too worn

Check how it meshes with the bevel you are using

Did it buy a new motor, rip open a couple of knackered neodym motors

Swap out crapped out armatures with a 22tpa ferrite one

Thus making up a cheapo torquey motor for just a bit of time

But really, new motors start from £25/£30 why bother going nutz

Use whatever you got 16-22tpa 30k to 22k aprox for most builds

With neo magnets if possible and whatever meshes with bevel

Get a couple of old motors and rip apart if you are bored to make up one or two new revamped ones if you like, new pinion/brushes but a new SHS HT will work well for £28 too

Up to you how much time you got on your hands and if you can be bothered