I trying to get a Derbi Start V to fire, unfortunately I am having low compression (~75 PSI). There is a minor leaking at the head gasket and major leak at the decompression valve. I am using a brand new head and an old decompression set-up.
I lapped the head and decompression valve with no improvement. I switched the decompression set-up to another head with the same results. Should I plug the hole or get a new set-up from treats?
I am going to mate the cylinder/head surface.