Home › Forum › Ask A Member › 1940 Johnson HA-15 W/Video › Re: 1940 Johnson HA-15 W/Video
I have the same issues with my HA-15 MarvK, every time I advanced the throttle I had to adjust the idle screw or she would die out in 30-60 seconds. I seem to have found a happy place for my main jet setting at .545 inch from the top of the carb to the base of the main jet knob. I luckily measured that distance for some reason before I disassembled my carb for cleaning and it must have been the magic spot. I managed to get it running and keep it running in the test barrel until I decided to shut it down due to getting a little too warm,i think it cools its best when their pushing a boat. Havent been able to get back to it since as I had my gallbladder out the day after I got her running after a month and a half rebuild. I’ll have to wait on taking it for a boat ride and fine tuning it until next season unless the cold weather holds off and I heal a little quicker.