RE: Welcome to Club SAITO !
Arlen:
"If it aint broke..." You might pop the other rocker cover as well, put a few drops of fuel on the other valve stem. Check the valve clearance, put the covers back on and run it.
I'm assuming it turns smoothly, the bearings don't feel rough.
But no, if I haven't made it clear, don't take the engine apart unless there's something wrong internally. A stuck valve doesn't count.
And you are number 272 in our little aggregation. The more the merrier.
Bill.