Good friend just gave me a non-running LB 7628. Mower appears to be complete and actually looks pretty good. I have cleaned muffler and ports, carburetor and checked for spark (yes, though it lt looked a little weak to me). Rough compression check yielded 25-30 psi and correlated to puny pull resistance with recoil rope. So, where to check next? Seals? Rings? Reeds? I am a reasonably competent shade tree mechanic with adequate tools, although unfamiliar with 2-stroke. I am up to tearing the engine down. Any thoughts, ideas, parts sources, etc., would be appreciated. I would like to get this green beauty up and running!