suzuki gt250 exhaust threads stripped

Need some help? Put your question up here. Many years of experience on the board to help you get up and running.

Moderators: oldjapanesebikes, H2RICK, diamondj, Suzsmokeyallan

Post Reply
cleaf
On the street
Posts: 29
Joined: Mon Jun 11, 2018 11:11 am
Country: finland
Suzuki 2-Strokes: suzuki gt250

suzuki gt250 exhaust threads stripped

Post by cleaf »

Hi

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!!!
You do not have the required permissions to view the files attached to this post.
User avatar
jabcb
Moto GP
Posts: 4240
Joined: Mon Dec 13, 2010 4:32 pm
Country: USA
Suzuki 2-Strokes: 69 T350 thru 75 GT750
Location: southwestern Pennsylvania

Re: suzuki gt250 exhaust threads stripped

Post by jabcb »

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.
viewtopic.php?f=2&t=13044&p=166230&hili ... ds#p166230
viewtopic.php?f=9&t=13016&p=165619&hili ... er#p165619
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more

Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
dollydog
Yeah Man, the Interstate
Posts: 630
Joined: Fri Aug 11, 2017 7:09 am
Country: england
Suzuki 2-Strokes: several gt250 ramairs

Re: suzuki gt250 exhaust threads stripped

Post by dollydog »

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.
Post Reply