<-=- Club Bevel Heaven -=->

Hi Kev - thanks for that, it's been so long since I've seen the "original" set-up I'd forgotten about the grounding wire on the negative lead from the trigger.
I gave away the road equipment on mine 20-odd years ago when I'd planned to make it a track bike, so connected that to a handlebar kill ...

Hi again Kev,
'Scuse me for asking, but what's the green wire connected to? It looks like a link wire of some sort with nothing on the other end?

Cheers,
Bill

Thanks Kev - you're right, that's a really strange result. Puzzling.
Thinking back, when my unit had definitely failed there were sometimes "ballpark" resistance readings going open circuit within about a second and sometimes several megohms. Initially I thought maybe a capacitor somewhere in the ...

Thanks Kev, that would be great!
If you could just measure the resistance across the output leads it's a simple calculation after that. It'll appear open circuit in one direction,due to the diode but we expect that.

Cheers,
Bill

From what I've gleaned from the 'net, there's only a single winding on the induction coil and the advance curve is generated by the rate of magnetic flux buildup relative to revs. I'm not an electronics engineer, so considering that Ducati in those years were pretty well versed in the KISS principle ...

Haha :-) Yep, that sounds about right (or trailer wire is the other favourite)
You may want to do your sums on the amps, just to be sure that 10amp wire is up to the job. Probably is, but if in doubt any local auto electrician can do the harness reconnect in a fraction of the time you or I would ...

Hi Butcher, last time I looked I had a VHB29 off my 450D on the shelf - unfortunately the air slide is firmly stuck in its tube.
If you fancy tussling with it, I'm happy to donate (I went Mikuni when I did the rebuild).
Bill

If you're keen to do the rewiring yourself, just Google "enamelled copper wire" and the companies who produce it have oodles of spec sheets online covering the properties of an amazing range of products.
I suspect that a fairly basic specification would be OK for our type of application. Good luck ...

Thanks Craig - I'll check that link out :-)
Ultimately it's going to involve a total dismantling I guess, so I'll be able to measure the length of the winding, although I'd rather avoid that if possible lol

Bill

The original had a trapezoidal wire to hook into the tubular channel at the front of the battery locator and a more rectangular "open" shape at the other end with a bent-up tail in the middle of the bottom side to engage a central hole in the mounting.
There are a few replicas available.

Good luck James, think I know where you've been shopping :-(
You might try Small Coil Rewinds in North Geelong; they're familiar with Ducati stuff but won't touch the ignition triggers (my pet project atm).
My impression from a short chat with the bloke is that they're happy to do alternator work ...

Does anybody out there know the details of this inductor pickup?
I've depotted my non-working unit and find a coil of 47 ohms resistance, a 1N-series half-wave rectifier diode and a 330 ohm resistor wired in parallel to the coil.
I'm suspecting one or more shorted turns in the coil, as I'd expect ...

Hi All,
My name's Bill, from Sydney Australia and have had a '72 Desmo 450 since new (73).
It's been recently overhauled and hopefully about to take to the road :-)
Other bike is a '89 Honda Spada 250.