Engine Will Not Start

Fuel tank is empty.

Disconnected or dirty spark plug.

Engine not primed (Model JS40 only).

Battery dead. (JS30 only)

Stale or dirty fuel.

Excess oil in engine or air cleaner filter saturated with oil.

Engine Starts Hard, Loses Power, or Runs Rough

Stale or dirty fuel.

Dirty air cleaner components.

Dirty spark plug.

Engine Stalls

Cold engine.

Cutting height too low.

Mowing too fast.

Engine Vibrates

Loose blade bolt.

Blade bent or not balanced.

Drive belt loose or frayed.

Mower Mows Unevenly

Mowing pattern not changed.

Height adjustment levers not set at correct position.

Blade dull, bent, or not balanced.

Ground speed too fast for conditions.

Discharge Chute Plugs

Grass not dry.

Cutting height not raised high enough.

Dirty or full grass bag.

Mowing too fast.

Mower Jerks or Will Not Move

Drive belt broken.

Transmission/wheel drive out of adjustment.

Mulched Grass Clumps or Rough

Grass not dry.

Mowing too fast.

Blade dull.

Cutting height set too low.