The engine normally turns CW to start, but it can start CCW (in reverse) and pull back the starter cord & damage the pull starter pulley (cracking it), and worst pull your fingers/hand back into the engine. This is because it needs to have the spinning motion (centripetal force) of the blades/blade holder plate in the right direction (CW) to start.
G'day
JohnWell that is news to me - that the engine can start CCW - and do this!
Great information to members for belt replacement and tensioning.
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Jack
