Johnson 9.5 no spark

[NoviceFisher]

I am not able to get a spark when trying to start my 1966 Johnson 9.5, any help would be a great.

We testest the plugs and they are fine, also removed the kill switch and tested with no luck.

Thanks

 

[RPJS]

Re: Johnson 9.5 no spark

The kill switch should be open circuit. If your not getting a spark on either plug the kill switch would be my #1 suspect.

 

[Xcusme]

Re: Johnson 9.5 no spark

Welcome to iboats!

You're next move is to pull the flywheel. Use a harmonic balancer type puller. Check the condition of the coils. If they're cracked, replace them. Check the condition of the points and regap as necessary.

 

[NoviceFisher]

Re: Johnson 9.5 no spark

I am very pleased with how fast your responces where, I am going to do just as you said and will let you know what I've found out.

Thanks again.

 

[Xcusme]

Re: Johnson 9.5 no spark

Just a clarification, the 'kill switch' is a Normally Open type switch. The two wires going to the switch are not connected when the motor is running, hence the name Normally Open. When the button is pushed , the switch closes and shorts the 2 wires together. This shorting action, in simple terms, grounds the points to both cylinders, killing the spark to the plugs. With no spark, the motor stops. It should be noted that if you disconnect the wires from the switch, insulate each wire separately. Make sure the two wires do not touch each other and don't touch the power head. If the motor does start, you will not be able to stop the motor by pushing the Stop button (obviously). The only way to stop the motor is to apply full choke and flood the motor. You can pull the fuel line connection too and let the carb run dry , but this could take a few minutes until the fuel in the carb bowl is exhausted.

You'll usually temporarily disconnect the kill wires for testing only. If the motor has spark after you disconnect the wires, it's safe to assume a faulty stop button. A simple Ohm meter can be used to test the switch action of the switch to verify a shorted (defective) switch.

 

[NoviceFisher]

Re: Johnson 9.5 no spark

What should the gap be?

Thanks again

 

[ezeke]

Re: Johnson 9.5 no spark

Point Gap is .020 - [should be stamped on top of the flywheel]. If the gap is right, clean the points up anyway. They tend to get a little carbon build-up after 10 years or so.8)

 

[NoviceFisher]

Re: Johnson 9.5 no spark

The fuel ratio is 50:1 on this motor and can you use one of those new plastic hand pump gas tanks?

Thanks

Sorry if this should have been another post.

 

[NoviceFisher]

Re: Johnson 9.5 no spark

I was not able to get point B to a .020 gap only around .009, is there another way to set the gap other then using the screw ajuster or do I need to replace them?

Also does it matter if the center rod is wet?

So as of mow we where able to get a spark every 10th pull, could this mean the coils are bad?

Thanks again for all your support.

 

[Xcusme]

Re: Johnson 9.5 no spark

Something's wrong....you should have plenty of adjustable range to adjust the point gap.

I'm assuming your talking about the crank shaft when you mention "...does it matter if the center rod is wet?" The center rod would be the crank shaft.

To adjust the point set, you'll need to rotate the crank shaft until the crank shaft key (woodruff key) is aligned with the rub block of the points. The rub block of the points is the part of the points that rides on the point cam ring . The point cam ring has the word 'Top' stamped into it. Using a feeler gauge, adjust the point set to a gap of .020. Snug down the point mounting screw and recheck the gap setting.

To adjust the other set of points, rotate the crank shaft until the points rub block aligns with the crank shaft key. Again, set the gap to .020 and tighten the lock down screw, recheck the gap.

As a side note, if the crank shaft is 'wet', this might be caused from a bad top crank shaft seal. Oil can be blown past the seal and cover the points and coils etc. This oil can foul the points contact surfaces and kill the spark.

 

[NoviceFisher]

Re: Johnson 9.5 no spark

In what possion should the throttel be at while gaping the points?

thanks

 

[iwombat]

Re: Johnson 9.5 no spark

Throtle position doesn't matter when gapping the points. Just line up the ignition cam as indicated above. Use the throttle to make fine adjustments to line up the cam appropriately.