Re: Late 50’s Johnson 18 hp compression?

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May 19, 2018 at 8:51 pm #76341
hdted
Participant

    I had a 1974 25hp NOS motor still in the box. It had 140 psi cranking pressure. I don’t know if there was a difference between the 18 and 25, but they were both 22 Cubic inch motors.