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PostPosted: Mon Jun 11, 2018 11:18 am 
On the street

Joined: Mon Jun 11, 2018 11:11 am
Posts: 22
Country: finland
Bikes owned: suzuki gt250

I have just bought -76 model suzuki gt250 and i have come a cross to first problem.

Exhaust threads in the left cylinder have been stripped so i cant put exaust pipe in cylinder.

I have already tried thread file to file threads but it didnt help.

Does anyone have any tips how to fix this problem????

thx for advance!!!

File comment: cylinder threads
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PostPosted: Mon Jun 11, 2018 2:33 pm 
Moto GP
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Joined: Mon Dec 13, 2010 4:32 pm
Posts: 3470
Location: southwestern Pennsylvania
Country: USA
Bikes owned: 69 T350 thru 75 GT750
There are tools to repair threads like these, but you can make it worse if you use them incorrectly. Depending on your skill level, you might find that the best solution is to take the cylinder to a shop that has the experience + the tool. (I would take it to a bike shop that works on older bikes.)

Some members have had similar problems. Here are two old topics about it.

BAS (Bike Acquisition Syndrome) - too many bikes but have room for more

GT750 2x75
GT550 72 project & 75
GT380 72
T500 73 project
T350 69, 71 & 72 project
T250 72
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE

PostPosted: Wed Jun 13, 2018 10:29 am 
To the on ramp

Joined: Fri Aug 11, 2017 7:09 am
Posts: 410
Country: england
Bikes owned: several gt250 ramairs
jab and cleaf, no matter what tool you use you won't repair worn threads. once they are worn they are gone and using the proper thread file you will cut the threads deeper and they will look better, but the exhaust ring will still push on the threads and won't tighten up. i'm working on this common problem atm, and the only way i can see round it is to mill the threads right off, so the exhaust stub is smooth, then put a threaded sleeve over the shaved stub, fastening it with grub screws. there must be thousands of barrels either thrown under benches or scrapped because of this problem. there are engineering firms that will tackle this for you, but for the cost you may as well buy some more barrels. :(
cheers, dd.

GTS250 road registered. TS250 engine, Ramair frame.
GT250 big bang road registered. Both pistons fire the same time. USD forks.
GT285 road registered. Overbored - 58mm and TS125 +2 pistons fitted.
GT10 road registered. '65 T10 engine, GT250 frame.

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