1975 JOHNSON 135HP IGNITION PROBLEMS

[WOODY367]

I HAVE A 1975 JOHNSON 135HP ENGINE MODEL#135ESL75. WHEN COLD THE ENGINE WILL NOT START. IT CRANKS OVER FINE, HAS FUEL. BUT SPARK IS WEAK. SO I PUT 4 NEW COILS IN BUT SAME PROBLEM. ALSO HAPPENS SOMETIMES WHEN HOT ON THE WATER. WHEN YOU PUT A JUNPER PACK ON IT FIRE RIGHT UP. BATTS ARE NEW AND GOOD. EVEN WHEN I TRY TO START IT WITH THE 2 BATTS ON THE BOAT SAME THING. IT SEEMS THAT IF YOU JUMP IT OFF A CAR OR A FULLY CHARED JUMPER PACK WITH 13-14 VOLTS NO PROBLEM BUT IF CHARGE IS UNDER 12.5 VOLT EVEN WHEN CRANKING OVER FINE WILL NOT LITE. YHIS IS GETTING TO BE A REAL PAIN. MY OTHER ENGINE A 1986 115HP WILL START WITH A BATT THAT CAN BARELY TURN OVER THE MOTR. IT HAS A PULL CORD FOR EMERGENCY STARTING "NOT THAT I PLAN ON USING IT" BUT IF NEEDBE YOU COULDN'T DOIT THE WAY IT IS. PLEASE HELP ANYONE.<br /> THANK YOU, BOB K.<br />P.S. PUT IN NEW PLUGS GAP IS CORRECT, NEW PLUG WIRES. AND ALL NEW BATT CABLES, ALL ELC. CONRCTIONS ARE CLEAN.

 

[50horce_force]

Re: 1975 JOHNSON 135HP IGNITION PROBLEMS

ok should be nething 2 serios Check list: <br /><br />spark plugs<br />spark plug wires<br />resistence in all electrical ignition wires<br />check all batt. connection / wires

 

[WOODY367]

Re: 1975 JOHNSON 135HP IGNITION PROBLEMS

IT HAS NEW PLUGS WITH CORRECT GAP, NEW PLUG WIRES. NEW BATT CABLES AND ALL ELEC. CONNECTIONS ARE CLEAN, HEEEELP

 

[almost retired again]

Re: 1975 JOHNSON 135HP IGNITION PROBLEMS

Hello Woody,<br />It sounds like the charge coils in the stator is getting weak. Check the resistance on the brown & brown/yellow leads that come from under the flywheel I don't have my manual at home so I can't give you the specs. Also make sure that none of the leads are grounded. Use a good digital multimeter set on the AC scale and read the voltage across each pair while cranking. The reading that I would look for is around 175 volts. If all this checks out I would suspect that the starter is getting weak.<br />Hope this helps,keep us informed.