JW10-1032176 3hp compression question

[Putty55444]

I have a 3 hp JW 10 that I love so when I found another one for sale online, I bought it.
It has great spark, very clean, it appears that the person that owned it before me had attempted to rebuild it. I can get it starting with starter fluid, but can’t keep it running. I decided to check the compression before I tore into the carburetor. Each cylinder is an about 60 psi, using the cheapo pressure tester that I have. Anyone know what the PSI should be on this motor? Thoughts on replacing the rings before I check the carb?

 

[F_R]

80-85 psi is great. BUT it depends on your compression gauge. The type with a relief valve located where the adapter screws into the spark plug hole are best. If the relief valve is located at the gauge AND connected to the spark plug hole with a hose are notoriously inaccurate.

There is a reason.