1993 Johnson 70 Timing

[Wide_N]

VJ70tLETS. Wasn’t getting fire so replaced timer base and power pack. Both were bad. Now have string fire on all three. Compression 125 on all three. When I prime little fuel in the carbs I get a backfire and no start. Acts like the wires are out of order but I’ve got tan/blue on top, purple middle and green bottom. Any ideas what else I might try?

 

[racerone]

Flywheel key could be sheared.----Did you torque it properly ?----Assembled it clean and dry ?

 

[Wide_N]

*strong fire

 

[Wide_N]

Yes to all. Even tried a different flywheel.

 

[boobie]

What's string fire ??

 

[Wide_N]

Corrected it to strong. Sorry

 

[flyingscott]

Make sure the wires in the connectors are correct.

 

[Wide_N]

The colors all match up. Power pack and trigger are both new.

 

[Wide_N]

Put a timing light on it and I’m 180 degrees off. Pin is not sheared.

 

[Tim Frank]

plug wires mixed?

 

[Wide_N]

No sir. They are correct. And if they were at least one mark of the three top dead centers I made would hit right? Or at least be close. Top dead center is when the piston is closest to the plug correct?

 

[racerone]

Perhaps the magnets around the hub are loose.-------Note a sheared flywheel key will still give you beautiful spark but just at the wrong time !----I do not understand how a powerpack and timer base can both be bad on one of these motors.

 

[Wide_N]

They were both bad. I have a DVA. Two different shear keys and two different flywheels have been tried with the same results.

 

[racerone]

Good luck with the project.

 

[Wide_N]

CDI tech support thinks that it could have gotten wired wrong in the pack. He suggests trying to switch the wires up.

 

[Wide_N]

Got a better timing light. All three cylinders are firing at the same time.

 

[racerone]

I do not believe that is correct.

 

[Wide_N]

Let me rephrase it. They are all firing on the same cylinder. I marked it with numbers. It lit 1 the 2 then 3 really fast. Pulled it apart now anyway for parts. Thanks.