I'll get some pics when I get back from school. The end of the motor (with the bearing in) is bolted to the motor side of the pump with 3 allen bolts. I hope they're not rusted solid! AFAIK it'll go back together. I just need to find a way to attatch the sprocket now, and get hold of a relay powerful enough. I COULD weld the sprocket, but knowing me the ratio will be wrong, and it'll go 10mph and wheelie everywhere, and I'll have to get a bigger one
The bearings are stiff, but smooth. They'll loosen up (I hope.) All I need is a brush spring. And would it make a difference if I skimmed the commutator on a lathe? I know it makes a difference on RC car motors, but I'm not so sure about larger, series wound ones.
Oh well, I haven't bought a single thing for this project so far, and a brush spring is nothing really. This is going to be mental on a tiny little quad.