I bought my 69 Bonnie T120r with right hand exhaust pipe blueing and heat discoloration near the head but didnt think much of it till now. I started it after rebuild and only after about a minute of running the right pipe was definitly hotter than the left by sight and on feeling the air coming out of each end, the right side was not only pretty warm but blowing stronger than the left. My novice mind decided that this could be caused by an exhaust valve sticking open during combustion thus blowing out hotter air at a higher power. Make sense? I had the valve guides renewed but a Harley mechanic took care of the head reluctantly and admitted he hadnt worked on a Triumph in 20 years and never willingly and aftr looking around he was the only person who would touch it. He knows HD really well but maybe not Triumph. Could he have missed something? Could it be the valve sticking open and if so should I just bite the bullet and pull it off and send it to a pro or is there a simpler fix? The timing is good and the blue pipe tells me that this was a problem before I bought it.