1976 Johnson 70 hp no power under a load

Johnmari · 10-15-2014, 08:35 AM

Spark plugs are as follows. Number one was coffee brown two and three still look new like no real change. I pulled and checked spark and it was good on all. Then I pulled plug wires while it was running the top one made it die the one in the middle made it run bad and the bottom one had no change. Is that because of a bad coil or a dead cylinder or bad power pack? It was sparking when I checked the spark on it. I have already replaced the top coil it is new and was told the other ones was good but now I am not so sure? Thanks for all the help.

View Poll Results: 1976 Johnson 70 hp
Carburetors	3	33.33%
Fuel tank	3	33.33%
Lower end problem	2	22.22%
Shift linkage problem	1	11.11%
Voters: 9. You may not vote on this poll

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10-15-2014, 08:35 AM	#1
Johnmari Junior Member Join Date: Oct 2014 Posts: 6 Thanks: 6 Thanked 0 Times in 0 Posts	Spark plugs are as follows. Number one was coffee brown two and three still look new like no real change. I pulled and checked spark and it was good on all. Then I pulled plug wires while it was running the top one made it die the one in the middle made it run bad and the bottom one had no change. Is that because of a bad coil or a dead cylinder or bad power pack? It was sparking when I checked the spark on it. I have already replaced the top coil it is new and was told the other ones was good but now I am not so sure? Thanks for all the help.