Bought a second hand SIKK a lot of compression, got gas to plug , got spark , but won't run. Have any ideas? Driving Me crazy down in La.

warped or loose cylinder, damaged cylinder base gasket will cause a MAJOR air leak and loss of case compression preventing start up ?

A sheared flywheel key will place point of spark in the wrong spot even tho you still have spark ?

These will be your most common places to check

THANKS sCOTT, gREAT PLACE TO START. Where can I get a breakdown of a SIKK engine,have any ideas ? I hooked water to the motor to keep it cool if i got it started and noticed some water coming out slowly between the head and block .

I want to thank everyone who gave me suggestions on what to check out on my SIKK . I pulled the flywheel and the key was messed up, but also the flywheel was bad.Also changed the gaskets on the carb.Waiting on parts now !!!Thanks to everyone!!!
Colen:-}