Mower not starting? Does it spin a little then stop suddenly? Most people assume it's a bad battery or starter, which it could be, but often it's a faulty "compression release mechanism" which is attached to the camshaft.
.....This device slightly opens the exhaust valve upon startup which reduces the compression. Once the engine is running, this spring loaded device remains out of the way by centrifugal force. Other reasons your mower doesn't start are valves in need of adjustment, bad battery, bad starter, loose battery connections, bad ground from starter.
Mower in video: Troy Bilt Pony, 2011, 17.5hp Briggs and Stratton, OHV

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