Scotts S1642, S1742, S2046 Operator's Manual page 58

IF
Loss of power
Engine continues to run when operator leaves seat Faulty operator presence safety switch.
Engine Backfires When Turning Engine "OFF"
Engine will not turn over
Engine Stops When Shift Lever Is Moved Rearward
and Mower Is Engaged (Hydrostatic)
Engine Stops When Gear Shift Lever Is Moved To
The R (REVERSE) Position and Attachment Is
Engaged (Gear)
TROUBLESHOOTING
CHECK
Cutting too much grass /too fast.
Throttle in "CHOKE" position.
Buildup of grass, leaves and trash under mower.
Dirty air filter.
Low oil/dirty oil.
Faulty spark plug.
Dirty fuel filter.
Stale or dirty fuel.
Water in fuel.
Spark plug wire loose.
Dirty engine air screen/fins.
Dirty/clogged muffler.
Loose or damaged wiring.
Carburetor out of adjustment.
Engine throttle control not set at "SLOW" position for 30 seconds
before stopping engine.
Clutch/brake pedal not depressed.
Attachment clutch is engaged.
Weak or dead battery.
Blown fuse.
Corroded battery terminals.
Loose or damaged wiring.
Faulty ignition switch.
Faulty solenoid or starter.
Faulty operator presence safety switch.
Normal condition. (See Using Reverse Implement Option in the
OPERATING section.)
Normal condition. (See Using Reverse Implement Option in the
OPERATING section.)
Troubleshooting - 54