Compression

[Caregiver5354]

Can anyone tell me what the compression is suppose to be on a B&S single cylinder 21 HP Model 931877 540cc Intek with XRD?

 

[ILENGINE]

Briggs doesn't list compression readings because of the compression release doesn't allow for an accurate reading. Leakdown testing is the preferred and more accurate test for engine health.

 

[Tinkerer200]

You have your model number wrong, it will be 33----. Compression will probably read 90 PSI or so but not really be accurate as said above.

Walt Conner