View Full Version : TT. 39
ThBrtmn
04-02-2004, 11:46 AM
Does anyone know if there are any known, unusual wear and tear issues with the TT .39. Like crap happening that just shouldn't in a short amount of time.
Obsessive
04-02-2004, 07:47 PM
The only issue I can tell you of is get ready for oil spewing out the front bearing all over the mechanics. The bearings in these sons of *****es really suck. Do yourself a favor and get the bearing kit from Boca Bearing ENK-077ST.
The only other issue is keep the low end needle open at least 3.25 turns. These engines do not tune like a YS or OS.
They've got gobs of power, but the stock bearings give out between 4-8 gallons.
Matthew
04-03-2004, 08:44 PM
The bearings in mine went quick. might be a good idea to change them when you get some down time.
ThBrtmn
04-03-2004, 11:57 PM
Thanks Guys...I appreciate it... I was thinking about getting one. Do you think it would be cool to get one still...with the BBearing change? Is the change hard?
Thanks
Ross R
04-04-2004, 01:16 AM
I don't own a TT39, but I have changed bearings before on my OS's.
Changing bearings isn't hard, it just takes effort.
Strip it down completely (carb, piston, head, crankshaft, all o-rings, etc) so only the bearings remain in the case. Put the case in the oven at 250-300deg for 10-15min. After just tap the block against something hard and they should slide out. While the case is still hot put the new bearings in.
Shannon Davis
04-04-2004, 01:31 AM
That is exactly how I do it also. Very easy-just hot :lol:
wow I have a new tt39 in my venture just starting my second gallon it runs great I guess I shold change the bearing :(
Lou
flyoz
04-20-2005, 08:03 AM
I dont think there is anything wrong with TT bearings. YIt may have been a poor one or incorrect tune or crud.
WillJames
04-20-2005, 08:15 AM
Brett Walker liked his TT 39 so much he kept it when he sold me the R50. I have talked to a few people who REALLY liked their 39. I have never had anything but TT Plank motors and they were great, still have a 61.
I use the wife's toaster oven (don't tell on me please) The bearings are very easy to get out when you heat the case to 300-350. One thing NOT to do is to rapidly cool the case once you put the new bearings in. I have heard of people warping things by using water to cool the case or clutch bell after installing the new bearings because they were afraid to let them get that hot.
Maybe compressed air would work, but I don't know for sure...
flyoz
04-20-2005, 05:47 PM
You should be able to get by just heating the engine to just hot. No need to fry it :D
The bearings can take that as its pretty much high operating Temp.
steve9534
05-23-2005, 12:24 AM
The bearings aren't what seal the front of the motor, it's the fit between the crankshaft and the crankcase. If you run the motor with a bad front bearing, the case will wear and ruin the fit, allowing fuel to spew out the front. If this happens, replacing the bearing won't cure it, you need a new case. If a new motor spews fuel out the front, it's bad from the factory and should be returned for replacement. Hope this helps. steve.