Hey guys, started engine up today, thought i'd iron out some little problems i was having, had it in idle, then all of a sudden, engine starts screaming, thought to myself??? looked at the stick, was fully down, looked at the servo, was in the idle position!! noticed there was barely any smoke, thought shiiit, pulled the fuel tubing out to stop it,

i then said, that leaned out for no reason, took the engine out, clean it up, tightened glow plug etc, then gave it the pressure check, finger over the exhaust port, and over the fuel nipple, blue into it, i could feel air escaping, didnt know where though, so i poured fuel down the carb, did the same procedure, fuel began to drip from the front bearing, thus an air leak

need a new bearing, i just need to confirm the part number so i can order it

is it- OS26731002

need instant reply thanks

26731002 is the front bearing for a OS Hyper 50, I think that is the engine you have. You didn't mention the engine in your post but I think you said you have the hyper before.

naa not the hyper, the normal 1, but there exactly the same according to my manual, same part number anyways.... please correct me if im wrong

http://www.rc-bearings.com he sells the set, do them both while you have them apart.

Yes, they are the same.

Took the engine apart today, bearings look fine, engine looks really healthy on the insides, im only gona replace the front, rear looks solid, taking the piston out, inspected the ring, and it was in about 5 pieces!!, ordered 1 of those aswel.

Cleaned off all the dead fuel remains with some thinner, engine is shining, gona polish it all tommorow

If your going to replace the ring, you might want to replace the piston. The piston has a little pin in the groove that holds the ring in place. I am willing to bet (as hockey puts it) a soda on it that this pin is missing or somehow got pressed into the piston too far to hold the ring in place. When this happens, the ring spins around the piston and gets hung on one of the ports on the cylinder. I have had this happen before. My pin was pressed into the piston too far by my stupidity when I was trying to slide the piston and ring back into the cylinder after a rebuild a while back. I didnt have things lined up right when i thought i did. The engine started up, but heard a wild high pitch clanking. I shut down quick and took the engine back apart to find my ring in pieces, and my head and piston damaged. Cylinder was fine though.

Hmm as as i said before, everything else looks very healthy, every thing is as it should be, apart from obviously the front bearing with a little air leak, and the ring, im not actualy sure if the ring broke during use, im sure i would of known if it did. or if i broke it while i was removing it.

as for the pin on the piston, its fine and as it should be