[NE350]

I just finished a rebuild (72 CB350), I attempted to start it today and it wouldn't go. Checked plugs for spark and found one was working one was not. Any suggestions on how to quickly and efficiently diagnose the problem.

Electrical issued despise me :x

Thanks, Matt

 

[jayel]

spark at both sets of points? switch the coil and condensers wires to the other set of points ... will it now spark on the other coil? possible bad coil, plug wire, plug cap or plug... you did try different plugs right?

 

[66Sprint]

Easy non-meter coil check...You'll need two wires with alligator clips at both ends......
Attach one clip to the Black/white wire on one coil...the other end of that same wire to B+.... Attach alligator clip of second wire to the colored coil wire (yellow or blue).... With a good plug in cap and grounded to head, "spark" the other end of the second wire by touching it and immediately removing it from a good ground (bolt/fin/ B-, whatever).... The plug should spark.... If it does, that coil assembly is good... If it doesen't, change plug cap with the one known to work on other coil, try again....
If it still does not spark, the coil and wire is bad.... If it now does spark, you have/had a bad cap....
If all the above (coils and caps) are good, you have a point problem...Check the wires leading to, and the points themselves....... It could just be a loose connection or a grounded point wire.... Steve

 

[NE350]

Thanks for the tips. I'll tackle this project when my wife and kids are not around or sleeping. My patience with electrical things are lets say... less than par


On a side note, when I attached the fuel line (the one on the bottom that connects both sides together) it wasn't secure enough and fuel spilled all over my newly painted engine. And the paint did not like the fuel all over it :evil:

 

[NE350]

Ok, I switched the coil wires and found that one was not working. I removed the points cover and noticed that only the left side was working correctly. I adjusted the right side and now, No spark on either plug. Here is a pic of the wires. Notice the lone wire with nothing attached to it. I don't remember if it was like this when I took it all apart. I'm thinking why would there be a wire that is not used? Can anyone identify it??

 

[tbpmusic]

Green is ground on your bike, so that may just be an extra ground wire....

 

[NE350]

Thanks, Bill any idea where I can get some new spark plug caps for it?

 

[66Sprint]

Matt... I agree, that is an "extra" ground....Your wiring appears to be correct (as well as I can tell from the pic), so my hunch is the trouble is at the points....... Manually lift them open (one at a time) and see if you get spark at both the point and sparkplug for each side.....(plugs OUT of cylinders)...If not, also try "shorting" across each set of points by touching with a small screwdriver and lifting it back off..... (they may not be "closing" and making contact).....
If you can get "fire" across both sets of points by either of the previous "tests", it's an adjustment issue...If not, there is a short to ground somewhere in the yellow and/or blue wires leading into the point housing/to the points (whichever one won't fire).... follow the wires and find/fix it.....

 

[NE350]

Yes I concur my problem is with the points, hense I ordered new ones. I will reassess my problem after installing the new points when they arrive.

If that doesn't work I may just have to fly one of you "up North" to manually fix it :lol:

Matt

 

[66Sprint]

Cool!....ROAD TRIP!!!!!!.... :lol: