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what would bend push rods on 18.5 hp ohv motor?

what would cause a 18.5 ohv briggs n stratton motor too bend push rods
jimmy, March 2011
Push rods can be bent by a back-fire while the valves are open due to, among other things, stricking a large object or embankment with the mower.

Ron, March 2011
Valves being hit by pistons or something (nut )being trapped in combustion chamber.

M, March 2011