Thanks. The bobbin is broken. Know anywhere I can get another?I'd be surprised if you could find them new 40 years on
but its not that hard to rewind them
I rewound one on one of my lads bikes after some clumsy dumbass
who will remain anonymous ripped the coil
( nobody saw me do it you cant prove nuthin)
What i did
I measured the thickness of the windings to asses the gauge and noted to direction it was wound in
then ordered a coil of magnet wire the same gauge as near as
I still have the spool here it was 250G of 0.18mm 33AWG but that wasnt for a CX mind you
and I could have done it easily with 125g
Next I stripped the bobbin down and cleaned/degunked it while I was waiting
With the new wire ready I made some initial loops and twisted them together for
mechanical strength and easier soldering to the inner terminal
then sat down and gently but firmly rewound the Bobbin so the wire took up
approximately the same volume as before.
I also used occaisional dabs of transformer varnish to stick the wires together as I wound it
Finally I looped and twisted the wire into a beefier outer terminal end and taped it up
with final coat of varnish.
Next day I refitted to the stator and soldered it to the harness using heat shrink and dabs of
varnish for added protection
Epoxy is an option of course
I didnt count turns and the resistance readings were near enough
It worked just fine and for all I know still is
BTW that's glass tape I used not insulating tape
Are there separate bobbins for those windings? I thought they were wound directly onto the core.It is for a CDI source coil, there are two of them on the stator. One is for high speed power to the CDI and the other is for low speed power. On the low speed, the coil has an open circuit. I need to find either a full replacement coil, 100 ohms, or I need to find the bobbin.
The source bobbins are wound around a plastic core that has a rectangular hole formed in the middle. The bobbin slides over the stator metal core or post. The plastic bobbin is about 16mm tall, 25mm long, and 16mm wide. That is what I really need if not a complete bobbin.Are there separate bobbins for those windings? I thought they were wound directly onto the core.
That would be fine. I'll need all dimensions, thicknesses, radii, etc.I can send a CAD diagram to you with the measured dimensions. If the cost is too high though, to me it wouldn't be worth it.
Here's a sketch of the bobbin that I drew up.I can print one for you, if you can supply exact dimensions. PETG (polester), ABS, ASA (an inprovement on ABS). All are thermoplastics, but print above 230C, so should handle the engine oil temps.