85 hp johnson 1972 no spark

joelster69

Cadet
Joined
Mar 25, 2003
Messages
13
my motor turns over great ,only sparks one time as i let go of the key,no spark while cranking,
 

papasage

Senior Chief Petty Officer
Joined
Jan 12, 2003
Messages
785
Re: 85 hp johnson 1972 no spark

sounds likea bad ignition switch
 

ledgefinder

Ensign
Joined
May 2, 2002
Messages
916
Re: 85 hp johnson 1972 no spark

Ignition switch is fine.<br /><br />The only time you're interrupting the current to your coil (and creating a spark) is when you turn the key off. Either your points, CD box or wiring is bad - they should be make/breaking current 4X per revolution. The '72 85 has points (under the flywheel); the 125 has a different setup with a sensor in place of the points. If you find a wiring diagram, you should be able to tell whether your points are working.
 

papasage

Senior Chief Petty Officer
Joined
Jan 12, 2003
Messages
785
Re: 85 hp johnson 1972 no spark

i have a factory repair manual i can take a pic or copy send it to you if i had your e mail or some one could tell me how to put it on the forum .not much on putting something on the forum.type a message is about it :D
 

joelster69

Cadet
Joined
Mar 25, 2003
Messages
13
Re: 85 hp johnson 1972 no spark

thank you for replying ,ill check the points, i have a clymer book,and a evinrude manual, these cover many diff motors, should i need the shop manual i'll reply,making progress
 

ledgefinder

Ensign
Joined
May 2, 2002
Messages
916
Re: 85 hp johnson 1972 no spark

It's probably a bad CD box, but might as well check the wiring & verify that points are doing their job before you spend the $.
 
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