Reply To: Hard to start HA 10 Johnson (1940) 2.5hp

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November 21, 2021 at 3:13 pm #249995
LLOYD LAUTNER
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    Your HA10 needs 70-75psi to start and idle well. Most of these motors still have adequate compression because they ran on 16:1 oil mix and the leather primer seals wore out long before the rings or cylinders wore out. So it’s possible that your compression may come up to adequate with some penetrating oil to free up the rings. In any case you will need new leather primer seals and instructions to install them. Look below for the TN26 discussion for info about the primer seals