Johnnyl30y
New member
1990 20 hp johnson.... I recently installed Sierra ignition upgrade kit to remove the components from under the flywheel. I still have no spark on either cylinder. Coils test good. Ground all test good. I did not have the specialty tool to set the timer sensor air gap, and am not sure how important that is. I've read that it is important, but was hoping to at least see some spark. I had to shave down some of the plastic on the new cdi sensor to get it to clear the flywheel (tech service told me to do this). What to check next?

