Originally posted by Splais
Do you think you lost your bearings due to poor run-in? I have also been thinking about putting the engine on a 1.20 Ultrastick I have and following the inflight run-in procedure. Seems a lot simpler (easier) to do; and if I have a deadstick in the Ultra, a lot easier to handle than in my new (used) 2M.
Well, now that I finally have the motor apart and am getting a good look at the inside, I'm less inclined towards my rusted-when-new theory. I'm now thinking the main bearings are simply not strong enough and mine were just hammered to death.
I was amazed when I pulled the crank this am at the teensy little main bearing. The crank is this huge monster but the main bearing is this tiny little thing in there......
No wonder the motor eats them up so fast. Close to 4 hp at only 9000 rpm, the hammering on that little bearing must be intense.....
Of course, I ran mine with the OS pipe which will make the motor work a lot harder than running it with a regular exhaust. That and low nitro fuel are what I'd suggest to get the power output down and thus save those bearings.....
LS