Reply To: 1956 Johnson 10hp. QD – 17 Compression

[David Stanton]

Just demonstrate it running and don’t mention compression.  Nobody I’ve sold or given motors to has asked about compression.  If someone asks, just say you don’t know but have them pull it over to see there is a good, hard, compression feel.

I got a compression gauge at a NAPA auto parts store with the valve at the motor end like others mentioned.  I had an old Sears one made for cars with the valve at the gauge and it gave me a lot of low readings.  On big cylinders in cars, the Sears one worked OK.

Dave