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47 083 03 65 mm deep x 178 mm O.D.
24 083 03 74 mm deep x 178 mm O.D.
7. When precleaner replacement is necessary, order
genuine Kohler parts.
24 083 02 61 mm deep x 173 mm O.D.
24 083 05 71 mm deep x 173 mm O.D.
Clean Air Intake/Cooling Areas
To ensure proper cooling, make sure the grass screen,
cooling fins, and other external surfaces of the engine
are kept clean at all times.
Every 100 hours of operation (more often under
extremely dusty, dirty conditions), remove the blower
housing and other cooling shrouds.* Clean the cooling
fins and external surfaces as necessary. Make sure the
cooling shrouds are reinstalled.
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.
*Cleanout kits 25 755 20 (black) or 25 755 21 (gold)
allow inspection and cleanout of the cooling fins.
Ignition System
CH18-25 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.
CH26 Engines - Incorporate a computer controlled and
monitored ignition system with individual coils. Other
than periodically checking/replacing the spark plugs, no
maintenance, timing, or adjustments are necessary or
possible with this system.
Check Spark Plugs
Every 200 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). A
high-performance spark plug, Champion
®
Premium
Gold 2071 (used on Pro Series engines, Kohler Part
No. 12 132 06) 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.
Service Paper Element
Every 100 hours of operation (more often under
extremely dusty or dirty conditions) replace the paper
element.
1. Loosen the cover retaining knob and remove the
cover.
2. Remove the element cover nut, element cover, and
paper element with precleaner.
3. Remove the precleaner (if so equipped) from the
paper element.
4. Do not wash the paper element or use
pressurized air, as this will damage the element.
Replace a dirty, bent, or damaged element with a
genuine Kohler element. Handle new elements
carefully; do not use if the sealing surfaces are
bent or damaged.
5. When servicing the air cleaner, check the air
cleaner base. Make sure it is secured and not bent
or damaged. Also check the element cover for
damage or improper fit. Replace all damaged air
cleaner components.
NOTE: If any loose dirt or debris fell on the air
cleaner base when the element was
removed, carefully remove it and wipe the
base clean. Be careful that none of it
drops into the intake throat. Check the
condition of the rubber seal on the air
cleaner stud. If the condition is
questionable in any way, replace it with
the new seal packaged with the
replacement element.
6. Reinstall the paper element, precleaner, element
cover, element cover nut, and air cleaner cover.
Secure cover with the cover retaining knob.
7. When element replacement is necessary, order
genuine Kohler parts.