Managed to get a screwdriver in the plug hole without removing the tank ect..Just happened to be enough room above that cylinder.
About two inches to swing a wrench as a hammer to tap on the valve felt out on one side.
Sprayed in plug hole and valve from the bottom below the head where access plate to valves was removed.
About the 5th time the valve was pushed up when turning the engine by hand and then tapped back down with the screwdriver; I could push it backdown through the plug hole by hand alone.
A few more cycles of the engine and the valve was returning by it's spring good.
Black muddy soot out the exhaust stack. Been there before..
I had pulled the muffler and ran it straight pipe for this operation.
I backed away till it stalled out. Still got splattered.
Then when it started again it was drier.
Drove it up on concrete and turned the gas off.