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Update: Johnson 15hp power pack coil question
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<blockquote data-quote="Fordman" data-source="post: 393793" data-attributes="member: 19841"><p>I had the same issue with a 1976 9.9 that I purchased used. The compression test showed 115 on each cylinder. It had been sitting unused for several years. I replaced the coils, plugs, points, condensers, thermostats, and water pump as they were all original. Also rebuilt the carb. All was done after running the motor in a barrel and finding an intermittent spark problem, one cylinder 30 degrees to hot, and then total failure of spark after a 10 minute run in the barrel. </p><p></p><p>After all of this service work I mounted it on my Sea Nymph 195 GLS as a kicker. It ran perfect for about two hours, then issues arose with it missing at first, then completely dead in the water :lol: </p><p></p><p>Leeroys Ramblings provided a clue when he mentioned changing heat ranges for these little motors that are used mostly for trolling. I had originally installed the NGK plugs he recommended in the BR7HS heat range and gapped at .030". They fouled out after about 3 hours of trolling. Taking his advice I purchased a set of NGK BR6HS and set the gap to .040". I have trolled about 12 hours so far without a miss.</p></blockquote><p></p>
[QUOTE="Fordman, post: 393793, member: 19841"] I had the same issue with a 1976 9.9 that I purchased used. The compression test showed 115 on each cylinder. It had been sitting unused for several years. I replaced the coils, plugs, points, condensers, thermostats, and water pump as they were all original. Also rebuilt the carb. All was done after running the motor in a barrel and finding an intermittent spark problem, one cylinder 30 degrees to hot, and then total failure of spark after a 10 minute run in the barrel. After all of this service work I mounted it on my Sea Nymph 195 GLS as a kicker. It ran perfect for about two hours, then issues arose with it missing at first, then completely dead in the water :lol: Leeroys Ramblings provided a clue when he mentioned changing heat ranges for these little motors that are used mostly for trolling. I had originally installed the NGK plugs he recommended in the BR7HS heat range and gapped at .030". They fouled out after about 3 hours of trolling. Taking his advice I purchased a set of NGK BR6HS and set the gap to .040". I have trolled about 12 hours so far without a miss. [/QUOTE]
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Update: Johnson 15hp power pack coil question
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