Briggs & Stratton — Check Compression
Testing & diagnosis · Engine
From a Briggs & Stratton service manual — check it applies to your exact model before use.
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Procedure
- Remove both spark plugs and insert a compression gauge into either cylinder, one at a time.
- Turn engine over with engine starter until there is no further increase in pressure; record reading.
- Repeat procedure on the other cylinder and record that reading.
- The difference between both cylinders should not exceed 25%.
Tools required
- Compression gauge Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Difference between cylinders should not exceed 25%
Source: Briggs & Stratton 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.