The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => Lucas, Ignition, Charging, Electrical => Topic started by: roadrocket on 28.02. 2016 16:24

Title: Removing slip ring
Post by: roadrocket on 28.02. 2016 16:24

Hello all

The slip ring on my RR has developed a indentation. Rather than wait for trouble, I want to replace it, and have bought a new from a very reputable dealer. But upon having researched the subject, I find I need a special puller to get the inner bearing race off. Furthermore, I need to take care of the HT spike. All very well, but I can't find any information as to how the HT spike is connected past the slip ring - is it not in any way soldered to something?

Otto in DK

Title: Re: Removing slip ring
Post by: Triton Thrasher on 28.02. 2016 19:25

I think the wire from the secondary coil just pokes into the slip ring.

Could you carefully thin the race with a small grinder?

Title: Re: Removing slip ring
Post by: beezermacc on 28.02. 2016 22:06

The HT wire from the coil just makes contact with the slip ring inside, no soldering. To check that you have contact after assembly use a multimeter, one probe on slip ring track, other probe anywhere on armature brass or steel bits, you should get a resistance reading of about 5500 ohms.