Thanks, good tips.
Threewheelbonnie, you speak the truth. It can be hard to figure out problems when they usually are not there :-)
I took a better look at the exhaust last night. The joint where the header meets the muffler is not that tight. I bet if the stuffing in the muffler is loose, and can block the path of the exhaust gas there will be a lot of sound when the gas is pressed through the joint at relatively high pressure. And the joint is right beside the engine. Maybe the sound wasn’t from the engine…knock on wood…
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Yamaha XT600E '01, Honda XR400 '03, Yamaha XT550 '83
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