Front or rear mount?  Rear mounts seem to use bearings, much more than front.  I have put about 1000 flights on Cobra bearings with a front mount motor.  Not close to that with rear.  Some of the rear mounted flyers gave up on Cobra.  It apparently has to do with harmonics of the spinning case, and even better bearings will fail.  It will be interesting to see other opinions.

I am happy with the bearings from http://rcbearings.com/. The quality is good and the cost is less than Boca Bearings. You just need to know what size that you need.

Just use Cobra bearings.  The ones you have have a "ton of flights" on them.  The replacements should also provide a "ton of flights" too.

How easy is it to change bearings?  I have 2 Cobra 2820's one of which got fried when the wrong wire touched another wrong wire.  Bearings should still be good though.  Mine will soon have a ton of flights on it too.

Ken

Not very difficult to change bearings.  Here's a video from Inov8tive Design on how it's done.

Thanks - Harbor Freight is a regular stop, I will check it out.  I had to swap out the bearings in a couple of IC engines and it was not too difficult.  Glad the electrics are just as easy.  Is there anything else that can wear out?

Ken