Thanks for your reply guys,
I will get in touch with you Cliffi when I'm in Tbilisi. Thanks.
The problem I have is a little bit embarrassing; some time ago when my sprocket fell off the drive shaft while riding in a middle of nowhere, I decided to get it welded by some village welder. :  :
It seemed as the only option at the time and I was scared that this could happen again and cause some serious trouble if I didn't. It was a brand new sprocket so it wouldn't be such a big problem if I could continue on it for another 30.000 km or so with proper care, but unfortunately because of welding the sprocket is not properly aligned which is slowly damaging the chain through constant chain wobble.
So what I need to do is to gently grind the weld off, remove the old sprocket and come up with some way to attach a new one without welding the sprocket on (maybe by welding some steal bolt on top of the drive shaft). I have all the parts (new sprockets and a new chain) so just need somebody who can work his magic. New weld is optional if nothing else works, but only as a last resort. I can always in future take the engine apart and replace the shaft but if possible I would prefer to avoid it do to amount of work required.
I know, it's all messed up, but I need to find a way to get it fixed.
What do you think? Is TIG the right way to go?
Thanks for your help
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