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1989 90 hp johnson. boat has sit for about 6 year, took off carbs. and clean them all up, new plugs, within about 10 min.s the motor was running, all 4 cyl. were getting warm, then cyl. 2-4 started getting cold. took out both plugs and checked for spark and had no spark.I checked the stator and had 180 volts 530 ohms. checked timer base and had from .7 to 1.6 volts and 42 ohms on all 4.I swaped the coils from 1 side too the other an no change. next day I put the coil back were they were and tried starting the engine again and it started up but after a few min.s 2-4 lost spark again, I rechecked everything again and had the same reading, so I tired starting it again then had no spark too any cyl. Power pack was dead, traced it too a bad coil(had no ohm reading at all). Replaced all 4 coils ,new wires and a new power pack. rechecked all reading and still had the same results so i started the motor, all 4 cyl. had 178 volts at coil, then cyl. 4 died an cyl. 2 has a very weak spark. the power pack is dead for cyl. 4. cyl. 1-3 are running great.I am at a lost and running out of money too put into this motor. any ideas.......
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rechecked everything this morning..timer base(had to unplug too test ,power pack is dead on cyl.4) getting .7 to 1.6 volts on all 4... voltage at coils 1-3 174 volts. voltage at cyl. 2 165 volts an cyl. 4 has 4.4 volts -
make sure you have a good ground at all points,I had the same problem cleaned all the ground points,so far several years same power pac.Comment
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I took the powerpack wire from coil 2 and swaped it on coil 4 and have 168 volts at coil 4 and an 4.5 volts at coil 2 now so I believe I have a good ground and a good coil.Comment
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