Originally Posted by
naftali
Hi,
Did you check valve timing? Timing, not lash
Surprisingly enough I was looking at that last night. I pulled the valve cover off and poured some oil down the plug hole (to seal the piston and ring) and was turning it over backwards and forward to listen for valve leaks and the intake valve did seem to close rather late. I've checked it a couple of times before now, lining up the dot on the crankweb with the case seam, and the dot on the cam facing down.
I replaced the intake valve when I rebuilt it and it ran normally after the rebuild, but did start playing up a few months after.
I tried lapping the valves a few days ago but it didn't make it run better or worse.
The valve I changed out looked like this, it was running fine but changed it out anyway...