there's a couple express manuals HERE break>
compression at cranking speed, wide open throttle, should be around 120psi on any of these little engines.
If it's low, squirt some heavy motor oil around the piston's edge through the plug hole. If compression improves the rings may be leaking..
Aside from loss past the rings, look for possible leaks anywhere above the rings, like around the head gasket or past the decompression valve or spark plug hole ..
find out precisely why something is leaking (warped head, wrong decompression valve cable adjustment, missing sparkplug gasket, etc) before cranking down hard on bolts and stuff.. Normal tightness should stop any compression leak if the parts are there and are in good shape.