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doch starting system gremlins.

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mattwrx

doch starting system gremlins.

I have a 79 dohc 750k. Had the damn thing running yesterday. then the right coil wasn't firing. today I verified that there was no spark from the coil. i then did what i did before. I took off the ignition pickups under the left crank cover and put it back on then i got spark. then i put the gas tank on and now neither coils are sparking. I have power at the coils but not ground. getting real tired of this bikes shit right about now. any imput appreciated.

mattwrx

Re: doch starting system gremlins.

update. now right coil is not working but left coil is. bike fired up for a sec on 2 cylinders... still has power to both coils. i had tested the right one by putting the left coil connection wires on it and it fired so coils are good.

TOOLS1

Re: doch starting system gremlins.

Administrator

In reply to this post by mattwrx

Sounds like a bad wire, or connection to the coils under the tank.
TOOLS

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mattwrx

Re: doch starting system gremlins.

do you think it could be the spark units? I hate opens/ loose connections... worst things to find.

mattwrx

Re: doch starting system gremlins.

In reply to this post by TOOLS1

I think I found it. I jiggled the connection form the coil wires to the harness and now have spark on both coils. worst location for circuit repair. thanks for the help

LukeM

Re: doch starting system gremlins.

Administrator

troubleshooting tip for the future:

If you have an intermittent electrical problem, an easy way to find it is to tap on the harness with a wooden dowel or drumstick. Sometimes a little vibration can reveal where a problem might be.

I fixed a CB500 this way, and the owner thought I was some kind of genius. Maybe he was right.

Luke M

Used to have a 1979 CB750L, sold it as a parts bike, now riding a slightly modified 1984 VT700C. Network/Field Engineer. Central OH, USA, Earth, Sol System, Milky Way Galaxy, Universe.

mattwrx

Re: doch starting system gremlins.

thanks for the help guys. I found out that one of the spark units had gone bad