1968 Johnson Sea Horse 65hp - Intermitent Spark

[GLPmike]

Hello,

Making some progress, but I am getting intermitent spark out of plugs 1 & 2 and nothing out of 3 & 4.

Reset my point gap to .010, attached an ohm meter and got 0 to infinity four times on one rotation of the cam shaft.

Spark plug tester set at 1/4 inch and I do get a healthy white/blue spark occasionally out of 1 & 2 whole cranking the motor. I get nothing out of 3 & 4.

Any suggestions would be welcomed.
Thanks

 

[GLPmike]

Re: 1968 Johnson Sea Horse 65hp - Intermitent Spark

The guys over at maxrules.com suggested that I set the points to .008.

Will give it a try tomorrow.

If so, I would assume my ohm meter may not zero out during a rotation. Well, gotta try something different, ya never know until you do.

 

[a70eliminator]

Re: 1968 Johnson Sea Horse 65hp - Intermitent Spark

I was following the advise given in your previous thread, thought you had it narrowed down to something within the cap and rotor?

 

[GLPmike]

Re: 1968 Johnson Sea Horse 65hp - Intermitent Spark

Is that a possibility?

I was ready that I could test the rotor and cap by hand turning the cam and rotor so that it is alligned with each plug while grounding the amp to cap feed. If everything is okay, I should only get spark to the plug that I am testing.

I was thinging of trying this when I take it apart tomorrow.

Is this test usefull?

Thanks

 

[GLPmike]

Re: 1968 Johnson Sea Horse 65hp - Intermitent Spark

Tried the following:

.008 = no spark

.010 = had intermitent spark on 1&2, no spark on 3&4.

.012 = had spark on 1 only for the first few turns of the motor, then no spark.

Also, ran the test with the key in the "on" position. While aligning the rotor with each spark plug distributer tower. Got spark at each cylinder while grounding amp/distributer wire. Whenever I did not get spark at the tester, I could hear arcing in the distributer cap. Also, at least once I got spark at a cylinder plug while the rotor was alligned at a different plug.

FYI-at this time I have not filled the sparkplug towers with a insulating grease/silicon.

I'd it possible my distributer/rotor is bad?

Is there another test to confirm? Maybe bring it to an auto garage or marina to test it?

Thanks

 

[GLPmike]

Re: 1968 Johnson Sea Horse 65hp - Intermitent Spark

Ended up buying a replacement distributor cap and rotor and plan on installing over the weekend....

 

[Pjbracke]

Re: 1968 Johnson Sea Horse 65hp - Intermitent Spark

Is that a possibility?

I was ready that I could test the rotor and cap by hand turning the cam and rotor so that it is alligned with each plug while grounding the amp to cap feed. If everything is okay, I should only get spark to the plug that I am testing.

I was thinging of trying this when I take it apart tomorrow.

Is this test usefull?

Thanks

How do you turn the cam by hand?