Kohler L600 / L654 — Compression Test
Testing & diagnosis · Engine
For the Kohler L600 / L654, from the Kohler service manual.
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Procedure
- Be sure air cleaner is clean and exhaust is not restricted before checking compression.
- Insert gauge in spark plug hole and take several readings on each cylinder.
- Consistent readings in the 110 to 120 psi range indicate good compression.
- Reconditioning is indicated if readings fall below 100 psi or if readings between any cylinders are far apart.
Tools required
- compression gauge Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 110 to 120 psi good
- below 100 psi recondition
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.