1971 johnson 100 hp no spark

[dscheppers1]

I have a 1971 johnson 100 hp and i have no spark. I was woundering what would be wrong with it?

 

[steveo32]

Re: 1971 johnson 100 hp no spark

HI, I am also new but have some knowledge with motors. Do you have spark an any of the cylinders? Have you chaecked wires for cracking? If the wires look old they probably are and they are relitively cheap. I would recomend changing those regardless just to make sure you have the best connection. Next step would be coils. Also this is a no brainer but make sure your Deep cycle marine battery is charged.

I am sure some of the other members will have some good suggestions also. Also try searching for other posts, I know there are alot of threads about this.

 

[Captain Haddock]

Re: 1971 johnson 100 hp no spark

I have the same engine... gotta just love it! Mine runs like a champ and is easily maintained. - A blast from the past!

To the topic:

Remove flywheel, remove distributor cap and rotor, unassemble&check condition & wear - bushings + points, (time for new points&capacitors?="TuneUpKit") clean parts, clean & oil lube-cushion, clean & apply _thin_ layer of grease on excenter, reassemble, gap at 0.010", check anti reversing spring . Clean distributor cap and rotor and reassemble.... also check the short inline fuse located at a wire above port top of powerhead.

The "PowerPack" or Capacitive Discharge Ignition Unit needs good connection to goods(ground) clean the mountings/screws/groundwireconnections.

When I bought my engine, the _purple_ wire was cut, right after the round main plug. (maby last owner had a "deadmanbutton", or COB - Captain Over Board stop in line there?)
It carries juice to the ingition system when ignition is on. Follow the purple wire...

Hopefully the capacitive discharge unit have not died on You. (mine is the original from ?71)

For spark plugs:
If not alredy fitted, use _only_Champion QL77JC4, or L77JC4 if not the first ones can be obtained.

Good luck

 

[SpitnSputter]

Re: 1971 johnson 100 hp no spark

I have a 1971 johnson 100 hp and i have no spark. I was woundering what would be wrong with it?

I got a 71 Johnson 100 hp and could not get a spark ...Took flywheel off and cleaned distributor till copper showed and one point was totally closed and no gap ... sanded and cammed it ...started right up..

 

[nanastew76]

Re: 1971 johnson 100 hp no spark

Check your power pack and if thats not it check your stator and see how many amps its kicking.