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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 11.

Wire Gauge

Spark Plug

Ground

Electrode

Figure 11. Servicing Spark Plug.

4. Reinstall the spark plug into the cylinder head.

Torque the spark plug to 24.4/29.8 N·m

(18/22 ft. lb.).

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.

NOTE: Do not apply 12 volt DC to kill terminal of

ignition module.

Fuel System

The CH26 fuel system operates under high pressure,

and the fuel filter and fuel line used must be approved

system components only. Use of substitute parts can

result in system failure, gasoline leakage and possible

explosion.

Fuel Filter

CH18-25 Engines: Some engines are equipped with

an in-line fuel filter. Periodically inspect the filter and

replace when dirty. Always use genuine Kohler parts.

CH26 Engines: A special, high volume, high pressure

filter with greater filtration capabilities and internal

surface area is used. See Figure 12.

0.76 mm

(0.030 in.) Gap

Figure 12. CH26 Fuel Filter and Line.

Replacement is recommended every 1500 hours, or

more frequently under extremely dusty or dirty

conditions. When replacement is necessary, always

use genuine Kohler parts.

Fuel Line

CH26 Engines: A special fuel line capable of

withstanding the high pressure of the EFI fuel system is

used (must meet SAE R9 specifications). See Figure

12. If fuel line must be replaced, see your Kohler Engine

Service Dealer.

WARNING: Fuel System Under Pressure!

Fuel Filter

Fuel Line