1977 kz650 points..no spark in 1 and 4

hi all....slight problem..i changed the end connectors on the plug wires...checked the ignition coils..both are good....spark in 2 and 3 but not in 1 and 4...spark in 2 and 3 point but not in 1 and 2. i clesned the points and both appear to close tightly...condenser issues possibly

runningtat
1977 kz650
nova scotia, canada

Did you check the dwell and gap on your points? Also, are the 1-4 points timed correctly? If you answered yes to all those questions check and make sure that the wire terminal on the 1-4 lead is not grounding out on the points plate where it connects to the condenser. Or it might be time to replace the condenser.

I know this dosent really answer your question, but I got shed of the points and installed a dyna unit, made all the difference in the world on how the bike ran

runningtat wrote:

hi all....slight problem..i changed the end connectors on the plug wires...checked the ignition coils..both are good....spark in 2 and 3 but not in 1 and 4...spark in 2 and 3 point but not in 1 and 2. i clesned the points and both appear to close tightly...condenser issues possibly

runningtat
1977 kz650
nova scotia, canada

If not already done, would check the following:

Assure batt+ voltage is reaching primary terminal of #1/4 coil;

Assure good connection at other primary terminal of #1/4 coil
(this wire runs to the left-side points).

When closed, the left-side points are furnishing a ground for the #1/4 coil primary winding.

When the points open, the coil primary winding is then ungrounded, which causes the coil to fire through the spark plug wires. At least that's the way it's supposed to happen.

Good Fortune!

[Click on image to enhance view.]

I had this issue this afternoon with my 80' 650. I took a fingernail file to the set of points that wasn't firing to clean them up, and it fired right up after that. one set of points wasn't firing AT ALL. No visible spark of any kind at the spark plugs or between the points gap.

So much for the time spent following the wiring and testing everything... even though it's important to do.

Gorham wrote:

I had this issue this afternoon with my 80' 650. I took a fingernail file to the set of points that wasn't firing to clean them up, and it fired right up after that. one set of points wasn't firing AT ALL. No visible spark of any kind at the spark plugs or between the points gap.

So much for the time spent following the wiring and testing everything... even though it's important to do.

Clean points are of course essential, and were here reportedly already cleaned and closing tightly.

Also essential is voltage to the coil conducted through its primary winding and on to the points, where clean contacts conduct to ground.

Good Fortune!

Patton wrote:

Gorham wrote:

I had this issue this afternoon with my 80' 650. I took a fingernail file to the set of points that wasn't firing to clean them up, and it fired right up after that. one set of points wasn't firing AT ALL. No visible spark of any kind at the spark plugs or between the points gap.

So much for the time spent following the wiring and testing everything... even though it's important to do.

Clean points are of course essential, and were here reportedly already cleaned and closing tightly.

Just thought i would chime in with my anecdote of hope in a similar situation...