Just bought a .12 Keep On, it's been quite a few years since I've had to run in a .12 (been running offroad for the last 4-5 years). Running in the engine doesn't pose a problem, but how long do I expect it to take? I've just recently run in a Bonito .21, but it was hand lapped prior so run in was relatively quick.
Looking forward to hitting the black stuff with this engine bolted into my new Mugen MTX6 Tourer