Jason,

The engine bearings which are installed inside model engines, are exactly the same as propriatery ball bearings you can buy anywhere. They are made by Timken, SKF, AST, QBC and other companies.

Buying them will usually save you some cash, when compared to buying them as replacement parts from the engine manufacturer.

You may save even if you buy premium grade bearings, which the engine manufacturer skimped on.

Just make sure you measure the bearing you want to replace, outside the engine, with a micrometer, or with a vernier caliper, so you know precisely the size you need.

The replacement bearing must also have at least the RPM rating of the replaced unit, the same heat rating (C3, or other) and the same number of seals (none, one, or both). The type of bearing retainer material should not be soluable in methanol, or in nitromethane.

You should take your old bearing to the bearing shop, to verify you get the correct replacement.