Re: '69 4hp johnson compression
Does it run? If it's been sitting for a long time you should get some oil or fuel mix into the cylinders prior to turning it over. Best case would be to run it a bit and then check your compression. I would expect anything from 65 to 95 for numbers. They should be within 10% of one another as well. Mine was in the 70's and went up a lot after a good decarb. Best of luck. Rick.