1972 Johnson 125 power pack problem

[Brianw86]

My motor died out up on plane at about 2/3 throttle didn't spit or sputter. Long story short it's now not getting spark. Replaced the ignition coil and everything under the flywheel checked professionally. The mechanic said in order to check the power pack he needed a special tester that most people no longer carry. Before I spend $300 on what they think is the problem my question is, is there any other way to test it?

 

[boobie]

Re: 1972 Johnson 125 power pack problem

Find a different "older mechanic" with the right test equipment.

 

[JDusza]

Re: 1972 Johnson 125 power pack problem



I think you can test the ignition with a spark gap tester such as the one in the attached pic. I have found this to be an exciting piece of equipment. Someone else with more knowledge can chime in. I made this one, copying what was shared by another forum member for a two cylinder with parts I had siting in my junk drawers...didn't even spend 50 cents for it. It looks like a 6th grade science project but it does what I need, very nicely. I would imagine you could make one with as many posts as you have cylinders.

For kicks I was going to make one with six posts for a Merc Tower of Terror. lol

I have used it to verify spark through to the plugs and swapped coil outputs to chase suspected coil issues vs. power pack.

Let's see if anyone can help more. This may be too simple for a complex ignition.
J