I recently completed my 1979 XS650 build, got it running, everything seems fine, but I was smelling gas. I've figured out it looks like both petcocks are leaking, I still need to be sure its both and not just one, but its hard when its below zero temps.
Having said all that, do people here recommend rebuilding or replacing? After 30 years, I can't see trying to narrow it down to a single gasket, I probably should replace them all with a rebuild kit. I've seen some people suggest to replace the vacuum type petcocks with manual. Seems it would be safer if I could turn off the fuel, but not sure if I can use that type on the 1979 model, I assume they put the vacuum type petcock on there for a reason.
Having said all that, do people here recommend rebuilding or replacing? After 30 years, I can't see trying to narrow it down to a single gasket, I probably should replace them all with a rebuild kit. I've seen some people suggest to replace the vacuum type petcocks with manual. Seems it would be safer if I could turn off the fuel, but not sure if I can use that type on the 1979 model, I assume they put the vacuum type petcock on there for a reason.