It will be fine on 14v. Assuming its the #3301 or #3316, and assuming its either geared, or running a small prop (6x4 or 7x5)
But you need to be more specific: There are at least 5 models of 'speed 600, 8.4v'
BB SP #6313
BB SP #6309
Two are possibly a bit marginal.
But the rest will do the 20k plus RPM that that sort of voltage implies no problem.
on DD a 5,1 x4.5 prop pulls around 30A and is about the limit I'd say. In bursts! Probably over propped even then 4.1x4.1" prop maybe.
But RPM is only 28,000 or thereabouts: That is probably OK.
Best efficiency will be at somethong like 15A or so, so provided you can operate in the sub 20A region it should be OK.
3.5:1 gears and a 10x7 gives a nice sort of power on 12 cells at low 30K RPM.
(9k at the prop)
Its not a question of heat so much - more a question of wherther the brushes and armature can physically take the RPM.
The #6312 looks like a sagami with the open brush gear.
If you have a whattmeter, try it on a small prop - 4x4 or so, and spin it up slowly to see if it starts to get erratic at full power - try and keep the current under 25A - 20A if possible - and get a feel for how hot it gets.
Too hot to touch is OK, over boiling point is too far. wet finger is a good test.
If it can handle the RPM, then its just a question of limiting the current to something sane.
Just about, but neodym magnets ar even more fragile than ferrites. I'd be worried about a motor that was over 100C on the case exterior with neo magnets.
I can't remember the curie point but its not a lot higher than that. Usually the glue softens and the magnete fall off anyway
Cobalt is the magnet that can stand heat. 300C or more.
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