Thanks, NormK. I pulled the filter and air cleaner and can see through to the choke butterfly. So all appears clear.
I pulled the head cover this morning and found the lash settings still to be right on spec.
So my next move will be to pull the carb and see if there is anything strange there. If not, it's off with the head.
Thanks again for everyones' help. I'll post again shortly.
Regards, Bill
