Hi... I recently acquired a 2013 Masport with a B&S 500 series motor on it... It appears that the previous owner may have hit something hard, as the centre of the cutting disc had cracked and allowed the disc to detatch. Turning the engine over slowly, it makes a chuffing sound... like it was leaking compression. When I gave it a pull on the starter cord it kicked back violently ripping the cord from my hand. A google search suggested checking the aluminium key on the flywheel... this was found to be intact.. This morning I pulled off the sump expecting to see the camshaft misaligned or had slipped... this also was found to be OK. What am I missing ? Ken.
