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Kohler CH25 Engine Engine

Name: Kohler CH25 Engine
Brand: Kohler

The Kohler CH25 is a 0.72 L natural engine rated at 3600 rpm. It powers generator sets from Genmac and Kohler, including the HSD12, HSG12 and 11RMY.

Also known as: Kohler CH25

0.725 L

Displacement

3600 rpm

Rated speed

Shared across brands: Genmac, Kohler

Speed trim value is abnormal
Cause: 1. Speed trim shorted or miswired.
Gap between speed sensor and gear teeth is too great
Cause: 1. Gap between speed sensor and gear teeth too great. 2. Improper or defective wiring to the speed sensor.
Fix: Check gap.
Defective speed sensor
Cause: 3. Defective speed sensor
Battery Supply Voltage (12 VDC) is not normal
Cause: 1. DC battery power not connected. Check for blown fuse. 2. Low battery voltage. 3. Wiring error.

Compiled from service & troubleshooting documentation across every generator set that uses the Kohler CH25.

Item	Spec	Part #	Interval
Air filter		—	500 hr	find
Fuel filter		—	300 hr	find
Oil filter		—	100 hr	find
Belt		—		find
Coolant	automotive antifreeze coolant	—
Oil	CD	—	100 hr

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

Parts listed by aftermarket suppliers as fitting this engine — leads compiled from supplier catalogs; verify the exact part for your serial number.

What is the displacement of the Kohler CH25?

The Kohler CH25 has a displacement of 0.725 liters.

Which generators use the Kohler CH25 engine?

The Kohler CH25 powers 3 generator set(s), including Genmac HSD12, Genmac HSG12, Kohler 11RMY.

How often should you change the oil in the Kohler CH25?

The Kohler CH25 oil change interval is every 100 hours.

What is a common problem with the Kohler CH25 engine?

A commonly reported issue on generators using the Kohler CH25 is: Speed trim value is abnormal. Cause: 1. Speed trim shorted or miswired..