1/2 spark

[cokeman22]

I was checking the compression on my motor . A 2000 Johnson 250 one with carbs . All between 105-110 so that was good . So I decided to check the spark n noticed no spark on half the engine . I'm think n maybe powerpack any other ideas or tests I can run

 

[Chris1956]

Re: 1/2 spark

That motor may have a shift assist switch, which kills spark to 1/2 the motor. The SLOW system also kills spark to 1/2 the motor. Sounds like you should check these out.

 

[cokeman22]

Re: 1/2 spark

Is replacing the powerpack easy n what's a easy test for a noob to check a powerpack I have a test light n a volt meter

 

[boobie]

Re: 1/2 spark

To test electrical components on a mtr, you'll need a multi-meter with a DVA adapter and a service manual. After you have the test equipment you can also go to CDI Electronics.com for procedures.

 

[Chris1956]

Re: 1/2 spark

Cokeman, Disconnect the shift assist switch (on shift linkage at motor), and see if spark returns. Disconnect both overheat sensors and see if spark returns. If so, you have found the culprit. If not, it could be the wire from the overheat sensor to the powerpack is grounding somewhere, or the blocking diode is bad. That will take some more sophisticated checking. It could also be a bad powerpack.

 

[Tim Frank]

Re: 1/2 spark

I may be missing something. but if you haven't noticed any performance drop-off I doubt that you are missing 1/2 your cylinders.
Maybe do the spark test again?

 

[cokeman22]

Re: 1/2 spark

Ok disconnected shift switch . All 6 now firing . Should I leave disconnected or just pop a new one on

 

[Chris1956]

Re: 1/2 spark

A new shift assist switch is about $100. Obviously see if you can get yours working. I need to wiggle the throttle handle to get the switch to open, each time I shift into neutral.

 

[cokeman22]

Re: 1/2 spark

Is there a part # for the switch I've been looking online and the pics they show don't look anything like the one I took off . N when u say see if I can get mine working ? I keep messing with the button n it keeps getting stuck and shut n off 3 cyl .

 

[cokeman22]

Re: 1/2 spark

 

[Chris1956]

Re: 1/2 spark

punch up the crowleymarine web site and put in the make, year and HP. If you know your model number that is good. Look on crankcase picture (I think) to find it.

 

[cokeman22]

Re: 1/2 spark

Thx I found it . I kept looking in the ignition pic . I'm gonna call a local dealer tomorrow to see if they have one . If not I'm gonna order one thx again