Need Help -Johnson 70HP 1975 Outboard Shakes

paulwang

Cadet
Joined
May 31, 2022
Messages
21
if spark follows the coil, might be a clue here. clean all coil connections and grounds until shiny. you could do resistance tests on coils. takes maybe 1 minute for all 3. i'd pull the head and check for water intrustion with that old 3 piece exhaust!
The secondary resistance of three coils: 1985ohms for the two old one, 2650 ohms for the new one. New coil is higher than old one. Primary resistance all about 0.5ohms.
 

tphoyt

Lieutenant Junior Grade
Joined
Jun 10, 2010
Messages
1,227
She sure sounds a lot better. You will be able to adjust the idle down while it’s in the water or even a barrel. You need some back pressure on the exhaust.
 

paulwang

Cadet
Joined
May 31, 2022
Messages
21
She sure sounds a lot better. You will be able to adjust the idle down while it’s in the water or even a barrel. You need some back pressure on the exhaust.
Make sure she runs smooth and correct this time. Adjusting idle and timing is next learning. Too much to learn.
 
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