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Thanks for the info Albuq, the problem is that all the exterior parts are missing, the valve seems to be moving but I have a exhaust backfire and I think this may be part of the problem
If you know which way closes the valve (i.e., normal hot engine position) clamp a pair of vice grips on the shaft and see if that helps. If it does, find a way to lock it in that position.
Mine was stuck
i tried to loosen it and broke it off
took the exhaust pipe off and pushed it closed for good
and put the broken pieces back on for looks
Thanks for the help, I turned the shaft clockwise and fastened it using a hose clamp, took it for a ride and the backfiring has almost stopped. I also feel that it has a bit more pep