htown16
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- Joined
- Apr 29, 2009
- Messages
- 1,484
I have an xs650 valve on my 72 commando. I have the head off to fix a stripped spark plug hole. I notice when I turn it over by hand there is almost like a back compression against the piston and its a little hard to turn. Nothing is binding but you can feel resistance on the down stroke and then the sound of air escaping. I'm assuming the xs650 valve has a reed in it that has to be forced open by a certain amount of air pressure. No complaints about the performance of the bike and just some minor leakes around the exhaust rocker covers. Just seems different than my Triumph and BSA which are easy to spin with the plugs out.