I hade a misfire in my propane burnisher (buffer). The Exhaust valve is stuck and wont move, as a result the push rods bent. Manufacturer recommended I get a new head. I replaced the head according to the instructions. New gaskets, new push rods, all bolts torqued to spec. The gap between the rockers and valve springs are gapped correctly. Yet I'm getting 120-130psi compression in the cylinder, where spec is 60-70psi. I've checked the head part number and engine model number and it all matches. The old head and new head look identical besides the carbon on the old.
I haven't tried it with any fuel because I'm scared of pre-ignition and ruining the head again.
Any ideas on why I'm getting high compression?
Engine: Kawasaki FS48V-ES10 Burnisher: PE400BU
Edit: For further context, Cylinder 2 is within compression spec. It was tested before and after the head on Cylinder 1 was replaced.