Cub Cadet RZT 50 Operator's Manual page 41

NOTE: Operating the engine with a blocked grass
screen, dirty or plugged cooling fins, and/or
cooling shrouds removed, will cause engine
damage due to overheating.
Ignition System
These engines use an electronic Capacitive Discharge
(CD) ignition system. Other than periodically
checking/replacing the spark plugs, no maintenance,
timing, or adjustments are necessary or possible with
this system.
Check Spark Plugs
Every 100 hours of operation, remove the spark plugs,
check condition, and reset the gap or replace with new
plugs as necessary. The standard spark plug is a
Champion ® RC12YC (Kohler Part No. 12 132 02-S). RFI
complaint engines use a Champion
Part No. 25 132 14-S) spark plug. A high-performance
®
spark plug, Champion
No. 25 132 12-S) is also available. Equivalent alternate
brand plugs can also be used.
1. Before removing the spark plug, clean the area
around the base of the plug to keep dirt and
debris out of the engine.
2. Remove the plug and check its condition. Replace
the plug if worn or reuse is questionable.
NOTE: Do not clean the spark plug in a machine
using abrasive grit. Some grit could remain
in the spark plug and enter the engine
causing extensive wear and damage.
3. Check the gap using a wire feeler gauge. Adjust
the gap to 0.76 mm (0.030 in.) by carefully
bending the ground electrode. See Figure 13.
4. Reinstall the spark plug into the cylinder head.
Torque the spark plug to 24.4-29.8 N·m
(18-22 ft. lb.).
Wire Gauge
Spark Plug
Ground
Electrode
Figure 13. Servicing Spark Plug.
® XC12YC (Kohler
Platinum 3071 (Kohler Part
0.76 mm
(0.030 in.) Gap
Battery Charging
WARNING: Explosive Gas!
Batteries produce explosive hydrogen gas while being charged.
To prevent a fire or explosion, charge batteries only in well
ventilated areas. Keep sparks, open flames, and other sources of
ignition away from the battery at all times. Keep batteries out of
the reach of children. Remove all jewelry when servicing
batteries.
Before disconnecting the negative (-) ground cable, make sure
all switches are OFF. If ON, a spark will occur at the ground
cable terminal which could cause an explosion if hydrogen gas
or gasoline vapors are present.
Fuel System
Fuel Filter
Some engines are equipped with an in-line fuel filter.
Periodically inspect the filter and replace with a
genuine Kohler filter every 100 operating hours.
Fuel Line
In compliance with CARB Tier III Emission
Regulations, these engines use Low Permeation SAE
30 R7 rated fuel line; certified to meet CARB
requirements. Standard fuel line may not be used.
Order replacement hose by part number through a
Kohler Engine Service Dealer.
Figure 14. Low Permeation Fuel Line.
11