It’s a 24V 450W brushed motor that’s proprietary to the brand, and I can only find old stock for sale for over $100 from the manufacturer. I’d like to repair the motor, or at least find a way to make it less spicy. I’ve taken the motor apart and nothing appears too bad. I replaced a bearing before I started riding it, so I don’t think that’s the issue. It gets especially hot where the drive gear connects to the shaft, but the chain is barely above ambient temperature so I doubt that’s part of the problem. The brushes still have a fair bit of life in them, although I may have them pushing too hard on the commutator as it was quite black and the brushed looked a bit more worn after riding for a few miles. Maybe the brush positioning is part of the problem? That could explain why I have to hit the motor sometimes to make it work. There’s not much grease or lubrication inside the motor, which could also be a big part of it. From the smaller motors I’ve worked on though, they tend to have little to no grease inside and do just fine.
There is a cooling fan connected to one end of the motor on the brush side; no idea if it’s providing the amount of cooling it’s meant to. I could try installing a computer fan against side of the motor but I doubt it’ll do much. The motor magnet-holder-part is painted black which may be absorbing too much of the Floridian summer sun, so I could try sanding it or painting it white if anyone thinks that’ll do something.
Appreciate any help given, thanks!