The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => Lucas, Ignition, Charging, Electrical => Topic started by: edboy on 07.11. 2018 20:09

Title: gutless k2f
Post by: edboy on 07.11. 2018 20:09

i have a k2f that had been overhauled and reconditioned a decade ago but now is giving me problems. it ticks over but gutless, breaks down on acceleration. poor spark. it must be the armature as i ve swopped everything over with a good working maggie.
rewind or condensor? i ve only done about 4,000 miles on this one and everything looks brand new.

Title: Re: gutless k2f
Post by: chaterlea25 on 07.11. 2018 20:15

Hi Ed
That sounds like a faulty condenser,  *????* There were some crap slip rings around too  *ex*

John

Title: Re: gutless k2f
Post by: edboy on 07.11. 2018 20:19

thanks for reply john.
that would be the easiest fault to cure as i have an easy cap condensor here. the slip ring is new and i ve belled out continuity.

Title: Re: gutless k2f
Post by: duTch on 07.11. 2018 21:00

 I recently had an issue with mine, that had a very tiny hole burn through from the slip-ring and was shorting to the armature....Slip ring only replaced a year or so ago, only done a couple thousand miles- have a really close look at it if the easy cap doesn't fix it

Title: Re: gutless k2f
Post by: edboy on 07.11. 2018 21:30

ok dutch. when i strip the mag i will take a close look.

Title: Re: gutless k2f
Post by: duTch on 07.11. 2018 21:40

 PS- was a brand new slip-ring too, a white one from England...

Title: Re: gutless k2f
Post by: trevinoz on 07.11. 2018 22:11

Those little holes are hard to see!!
I've also had one but mine was a black one.

Title: Re: gutless k2f
Post by: bsa-bill on 07.11. 2018 22:25

are you talking about a different tiny hole than the one for a lubrication wick

Title: Re: gutless k2f
Post by: duTch on 07.11. 2018 22:33

 

Quote

  are you talking about a different tiny hole than the one for a lubrication wick 

 I think so Bill- I'm cranky that I didn't end up with the S/R to take a photo, but was a burn hole no bigger than pin-prick size (if that) in the 'armature interface surface' of the white slip-ring, can only be seen disassembled

Title: Re: gutless k2f
Post by: lawnmowerman on 07.11. 2018 23:59

Hi Ed

I had very similar problems on a K2F that was only rewound about five years ago. Turned out to be soft carbon brushes which left a coating of carbon around the slip ring and cheapo pick-ups.
Cleaned up the slip ring and fitted decent brushes and pick-ups from Brightspark and it feels like a different bike.

Jim

Title: Re: gutless k2f
Post by: Triton Thrasher on 08.11. 2018 07:16

Quote from: bsa-bill on 07.11. 2018 22:25

are you talking about a different tiny hole than the one for a lubrication wick

The cam ring has a hole for a lubrication wick.

The cam ring is not the slip ring.

Title: Re: gutless k2f
Post by: bsa-bill on 08.11. 2018 11:01

Quote

The cam ring is not the slip ring.

you right TT, I misread somewhere