I'll ask you guys.

I finally did my first succcessful auto but it was a forced one. I have been running my Raptor with the stock TT39...had it really running sweet, but I had just switched to 20% nitro fuel. After making a few minor high needle adjustments (had gone lean with the new fuel or so it seemed) I was making a few FF passes and was heading back to the pits when I experienced a sudden loss of power. I managed to get stablized and hit the throttle hold for a fairly in control auto (only one bounce!). I just knew she had over heated but checked the back plate and all was well! I noted lots of smoke before the problem occured so....what the hey? When I got back to the pits I tried to restart but she turned over 270 deg. and seized. I just knew I burned it up. I tore it down at home and found pieces of the back bearing cage throughout. A piece had gone up the intake and wedged itself between the piston and sleeve jamming the ring in the proccess. A new piston and ring fron Heliproz is $37 and a bearing set is another $19. This may seem like a dumb question but is the TT39 worth rebuilding? It would cost $140 to replace with anything else. What say you all?
Wazowski

I've never owned a TT engine but, their reputation is not very good in the online forums so I guess I never will own one. You asked for an opinion. I would put the TT-39 on eBay "as is" and get what you can for it, $30-$40, take the $57 you were going to spend on it and put it towards purchasing a OS 37SZ-H. The differnce would amount to about $40-$50.

I had a thunder tiger .36 that just ran and ran for years. But it finally tired and i bought an OS 37, WOW! I have a few gallons thru it now and WOW WOW! Cant miss with this engine, but you do need a larger that standard .30 size pipe/muffler for it. Most people are using the Hatori made just for the OS 37 ($80 btw) or the Toki 40's muffler from MRC($40) to reach the full power that the motor can make.

Same thing I told him on Run Ryder

Sounds like a good time to upgrade to a 50 size machine to me. Since the engine is most of the upgrade cost it's something to consider, IMO.