500 H1E ignition rotor

[motocon]

I have a 74 H1E and am not getting any spark. First test I complete is the ignition rotor.
I get a short on one half of it and an open on the other.
Sooooo, I guess it has to come off.
What kind of puller do I need to do this???

Thanks

[Deleted]

The short is normal how you are measuring-it's the same place electrically. The other measurement could be a failed slip ring connection. You might be able to take it apart. Check the book for resistance values and the setting on your meter first and use a lower meter setting. The puller is a special bolt that goes into the center of the rotor and pushes on the crank, not sure of the thread pitch-someone will chime in.

[motocon]

The book tells me 3.5 - 5.5 ohms.
It doesn't really specify where to place the meter leads.
I've tried every setting from 20,000- 200 ohms.
Thanks for the info on the bolt puller.......will have to figure something out for that.

[Jim]

The 3.5 to 5.5 value is for early H1s with wound rotors, not a late H1 like you have. Your rotor is a permanent magnet type. The brushes and conductive segments form a sort of distributor, which grounds one of the three coils at the right time to make just that one fire.

The outer continuous ring is kept at ground by two carbon brushes. It connects to the partial inner ring which the three remaining brushes rub on as it rotates. The remaining part of the inner ring is not connected to anything. This means if you measure the resistance from that disconnected section to the grounded parts, you should read infinity ohms (open circuit). Measuring any part of the grounded sections to any other part of the grounded sections should give a zero ohms reading (continuity).

I suspect you'll find that your rotor is OK. You do need to verify that the five carbon brushes are in good shape and that their wires are intact, and that the rotor segments are clean.

[Deleted]

Interesting Jim, sounds like a better system than a rotating field winding with slip rings like mine. I'm just waiting for mine to toss its cookies! I have a spare permanent magnet rotor.I wonder if I could wire in a suitable regulating diode and use the existing points, rectifier and stator?

rt

[motocon]

Thanks Jim......looks like you just saved me some time/work for nothing.

I will check the brushes, rotor segments etc....

I' m not really loving the manual for this bike. It covers so many different model years and the ignition systems were so different.