Cub Cadet MTD 70 Series - Manual (Page 34)

61/65/70/75 Series Horizontal Shaft Engines
28
Troubleshooting flow charts
Ignition Troubleshooting
Engine will
not start
Engine runs
erratically or shuts
off, restarts
Check for spark
Spark No Spark
Check for the correct spark
plug
Check flywheel and key for
damage or sheared key
Set proper air gap on
ignition module
Test ignition module
for intermittent or
weak spark
Check electric starter and
battery if applicable
Replace spark plug
Isolate engine from
equipment and repeat
test
Spark No Spark
Equipment problem,
check switches, wiring
and equipment controls
Engine problem, check
for shorts or grounds in
wiring
Disconnect ignition
ground-out wire at
the ignition module &
repeat test
Check for proper air gap
on ignition module
and repeat test
Check flywheel magnets
for strength
Test ignition module