17 thoughts on “Briggs & Stratton compression test

  1. I wonder how he got so much compression. All 4 stroke small engines have a built-in compression release on cam to limit compression to around 45 to 60psi. Comp release must have broken spring.

  2. I did a compression test on a 4 hp briggs when it had about 50 hours on it and I got 60 PSI. The compression release must be broken on this lawn mower…

  3. Ive tested yesterday a Victa with B&S 3.75 'Sprint',I was actually concerned the engine had low compression as it doesnt seem to develop any more revs beyond about half-throttle, also seem to be half-missing a lot on idle, tested warm with several cord pulls it creeps up to just under 90PSI..it doesnt blow any smoke but Im sure there is some issue with this engine, doesnt run as lustily as another 3.75 I have..

  4. Briggs & Stratton side valve (L-Head) engines use a compression ratio of 6 to 1. Our Overhead Valve (OHV) engines use a compression ratio of 8.5 to 1

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