No spark on 1968 100hp Evinrude

[smith100evinrude]

Supreme Mariner, What is the vacuum switch for? What does it do?

 

[F_R]

Supreme Mariner, What is the vacuum switch for? What does it do?

Those motors, with original pulse pack could, and sometimes did, instantly start running as soon as you turn the key on, without even running the starter. The vacuum switch delays voltage to the pulse pack till the starter is actually cranking the motor. It is my unproven understanding that at some point the replacement pulse packs do not give that spark as soon as the key was turned on, making the vacuum switch on longer necessary. Or so I've been told.

 

[smith100evinrude]

Thanks, I have 13.8V at the green wire on the pulse pack, I took off the flywheel, cleaned everything and the reverse spring was not touching the crankshaft (it is not). going to set the points now, then try to fir it up AGAIN!

 

[racerone]

Wait now------What motor have you got ??----Model # is ?-------I ask because a 1968 model 100 HP did not leave the factory with points !!

 

[smith100evinrude]

Sorry points is not the correct term, sensor, It was set at the proper gap .028 and it tested good. Still nothing!!

Its model 100883B.... Any more suggestions?

 

[racerone]

Using the correct terminology is very important !----Beginning to sound like a new amplifier / powerpack may fix it.

 

[smith100evinrude]

can my power pack be test or do know how?

 

[F_R]

13.8V while cranking? Did you have it on a charger or something?

 

[smith100evinrude]

Nope, no charger

 

[F_R]

Great battery.

 

[smith100evinrude]

do you know how to test the power pack

 

[F_R]

I know how we did it back in "The Day" when we used the special tool neon tester. All that is obsolete now. Now the preferred method is a DVA (peak-reading) voltmeter. Instructions by CDI are on-line.

 

[smith100evinrude]

Thanks, I'm going to retest the pulse transf today