Well,Mark,I drip it,I don't spray it.I spray it into a little container and drip it onto where I want to check.No,I didn't mean the gasket where you said but the gasket between the CYLINDER(jug)and the block-tranny case.Also the connection at the carb where it slips onto the intake and the gasket where the intake mounts to the jug.Keep that stuff away from your eyes!As to timing:YES,a sheared woodruff key in the flywheel will mess you up completely.You can check that with a common strobe light.My induction timing light just clips over the sparkplug wire and I hook the red and black power leads to any 12 volt battery.Works great!