mine now has 145 psi. when i first got it, it only had 65psi and smoked bad and bumped up to 85psi with oil down the cylinder (wet test). i changed the oil and took out the plug and let the oil soak on the top of the piston. Running 145psi now at WOT and 4-5 pulls. just ordered a 200cc motor from Harbor freight for 99.99 SHIPPED!!! just an idea
i also have a set of rings and head gasket here for the 120 i might not need.....good luck.