Cub Cadet Z-Force S Series - Manual (Page 162)

Z-Force-S
156
The spark plugs
The spark plugs should be checked, cleaned and re-gapped on a monthly basis or every 100 hours of use. The
plugs should be replaced every six months or 300 hours of use.
When checking the spark plugs, a dry, light colored residue on the plugs is a sign of running lean.
If there is a thick, wet, black residue on the plug the engine is running rich.
There should be a dry tan coating on the plugs. This would indicate the proper mixture.
To remove/replace the spark plugs:
1. Disconnect the spark plug wires on each side.
See Figure 9.1.
NOTE: Do not use metal pliers on spark plug wires.
Damage to the wire can result.
2. Remove the spark plugs with a 13/16” spark plug
socket. See Figure 9.2.
3. Clean the Spark plugs with carburetor cleaner or
replace them with two NGK BPR4ES spark plugs.
NOTE: Do not clean the spark plugs mechanically
(sand blasting or scraping). This will damage the
insulator.
4. Gap the electrodes to .030” (.75mm).
5. Thread the spark plugs into the spark plug holes.
6. Tighten the spark plugs to a torque of 16 ft - lbs
(22Nm).
NOTE: Refer to the Kawasaki engine manual for
more detailed instructions.
7. Push the spark plug wires onto the spark plugs until
they snap into place.
8. Test drive the mower in a safe area before returning
it to service.
Figure 9.1
spark plug wire
Figure 9.2
Spark plug