Bike sparky help needed.

[nzspokes]

Once I identify the power input to the CDI could I just run a lead from the switched ignition to the CDI and just have it that way? Or does it drain the battery to much?

[bogan]

Ok, What ive worked out is....

Black/white kill switch. Goes to ignition and kill switch.

Black/yellow goes to coil and tach so pulse line.

Blue Pulse generator

White Pulse generator

Green earth, goes to coil also.

Blue/ yellow is ??? Guess it has to be power in?

The blue yellow goes to the clutch side of the motor. Seems to be a switch in there. 2 wires go in, the blue/ yellow and green/white. Could that be the pulse generator? I thought it was in the stator as the blue and white come from the stator which is on the other side of the motor..

If you black/white is coming from the ignition switch etc, you should be getting voltage at the CDI end, as that is how you turn it on! Figure out why the voltage isn't getting there. Make sure voltage is getting to, and through the ignition on that line.

That first diagram pete put up looks good. Seem the white/green (you keep refering to it as white only?) is an engine kill, hooked up to sidestand. Rest is damn hard to decipher due to resolution.

[nzspokes]

If you black/white is coming from the ignition switch etc, you should be getting voltage at the CDI end, as that is how you turn it on! Figure out why the voltage isn't getting there. Make sure voltage is getting to, and through the ignition on that line.

That first diagram pete put up looks good. Seem the white/green (you keep refering to it as white only?) is an engine kill, hooked up to sidestand. Rest is damn hard to decipher due to resolution.

Ive pulled the ignition switch apart and it does not get power when in the on position. Connectors in the switch dont send power to it. it goes to the black out of the ignition. First diagram has helped a bit. Now think that the blue yellow is the pulse and the blue and white are AC power feeds from the stator. Will be going home at lunch time to test these at crank speed to see what comes out.

[bogan]

Ive pulled the ignition switch apart and it does not get power when in the on position. Connectors in the switch dont send power to it. it goes to the black out of the ignition.

What goes to the black out of the ignition?

What color wires are in the ignition? do any show voltage?

[nzspokes]

red/ main power
Black/ switched out
brown/ lights
brown/white lights
black white/ switched to earth when in stop or parked
green

[nzspokes]

just had long talk with bike mechanic. Sounds like my stator needs a rewind. theres a secondry power supply in there that should be suppling AC votlage to the CDI. Going home at lunchtime to test.

Anybody know a good rewinder?

[neels]

So it sounds like your wiring is similar to this judging by the colours you have listed....



If it is, the black/white from the ignition/kill switch to the cdi is to kill the engine when grounded. There should be volts and a trigger pulse going into the cdi, but no 12V supply to the coil or cdi from the battery.

maybe....

[bogan]

just had long talk with bike mechanic. Sounds like my stator needs a rewind. theres a secondry power supply in there that should be suppling AC votlage to the CDI. Going home at lunchtime to test.

Anybody know a good rewinder?

Turns out hondas from that era can be very different! Never knew CDIs were run from AC before, maybe it is recitified in the CDI to a different voltage more appropriate fro the coils? But that theory looks right from pete's first wiring diagram. Could be a bastard to test!

[nzspokes]

Turns out hondas from that era can be very different! Never knew CDIs were run from AC before, maybe it is recitified in the CDI to a different voltage more appropriate fro the coils? But that theory looks right from pete's first wiring diagram. Could be a bastard to test!

Yup its taken me a week to sort it out. Spoke to a guy that supposed to be the guru on old Hondas. He said straight off the coil stator was going to be the issue. They can run fine with no battery as long as you dont want lights etc. Yes looks like the CDI rectifiys to. Common problem. Ive found a second hand one so will get that tomorrow then get my old one rewound as a good one to go in. So tonight I will put it all back togeather and may start fitting the pack rack that I got for it.

Thanks for everybodys help!! hopefully its going to run.

[nzspokes]

Just to confirm, I should be measuring the AC voltage between the 2 leads?

[bogan]

Just to confirm, I should be measuring the AC voltage between the 2 leads?

You'll have to be more specific, which two leads?

[neels]

First question one has to ask is dear god why? Can only assume it is some byproduct of grafting a trail bike engine into a road frame.

Not knowing how it's wound it's a bit hard to say, but a multimeter on AC should see something, at best pulsed DC but unlikely to be DC.

[nzspokes]

You'll have to be more specific, which two leads?

Sorry, getting a little fuzzy. 4 hours sleep over the past few days working on this.

The white and blue leads from the stator that power the igniton.

[nzspokes]

First question one has to ask is dear god why? Can only assume it is some byproduct of grafting a trail bike engine into a road frame.

Not knowing how it's wound it's a bit hard to say, but a multimeter on AC should see something, at best pulsed DC but unlikely to be DC.

So it can run with dead battery, crash starting it should run. Or so the story goes.

My multimeter can measure ACV.

[bogan]

Sorry, getting a little fuzzy. 4 hours sleep over the past few days working on this.

The white and blue leads from the stator that power the igniton.

If they definitely come from the stator (not pulse generator) then yeh. The wiring diagram I'm looking at is a bit different.