Howdy, Im helping my bro in law get a 66 Triumph Tiger Cub back on the road. We were kicking the heck out of it yesterday ( think the carb needs a cleaning) and I noticed that we had a gassy air leak out the threaded spark plug hole in the head. Seems like the threads are buggered up but the spark plug still threads in place nicely. Definitely some air leakage. Any one know a good shop that can fix this? I wouldn't trust any yokels in my town with it... Helicoil it? Or is this a new head kind of issue? Thanks for any help!