Kohler PCH680 / PCH740 — Compression Test
Testing & diagnosis · Engine
For the Kohler PCH680 / PCH740, from the Kohler service manual.
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Procedure
- Perform on a warm engine. Clean dirt away from base of spark plug(s).
- Be sure battery is fully charged, unplug ECU, and throttle is wide open during test.
- Compression should be at least 160 psi and should not vary more than 15% between cylinders.
Tools required
- compression tester Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- at least 160 psi
- vary no more than 15% between cylinders
Source: Kohler service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.