Home › Forum › Ask A Member › 1975 Johnson 135 No spark starboard side › Re: 1975 Johnson 135 No spark starboard side
Jeff, turn it over with the plugs out. That will increase the cranking speed. If it fires on all four cylinders then you may not have a problem. I can bring my sensor washer with me to Tomahawk & we can set the sensor gap closer to the flywheel hub magnets. Cranking speed needs to be 350 RPMs minimum to fire all cylinders. The minute the engine fires it will pick up speed and all cylinders will spark at that point. They built a later set of sensors #581900 (red sensors) that had more windings which would fire at a lower RPM, but you can adjust the older sensors sometimes. Taking out the spark plugs will give you an idea if this is what you are up against. See you in Tomahawk.
Dan in TN