81 Virago 750, Sparks SOMETIMES

PancakeShake

Been Around the Block
Working on rebuilding my buddies Virago 750 last night, and rebuilt the wiring harness.

When we tested for spark, #1 coil HAD spark, #2 didnt.

Thinking it was a bad coil, we switched the coils just to see, and #2 had spark and #1 didnt.

So the GREY wire coming out if the CDI was putting out sprak, BUT the ORANGE wire was not.

At this point I looked at the wiring diagram and saw that the Orange wire runs through the Tach unit, which leads to variuos different switches. So i though we were going to have to wire all that junk in. However, for the hell of it, we tested spark again, and BAM, both coils had spark.

Questions:
Do we NEED the tach unit hooked up? If so, how can you bypass it?
If we have spark on and off randomly, is that a sign of a bad CDI?

Thanks guys!
 
kevs.png


Thats what we have right now. With the key wired in before all the positive leads.

NOTE! With this setup the bike does run, but just on one cylinder.

We had spark in both heads for a little bit, but then it stopped working again.
 
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