Gear change cam plate plunger or swinging arm?

[spanersc]

Another question to our knowledgeable readers. Are the gear change cam plates interchageable between a plunger gear-box and a swinging arm one? The BSA part numbers are different but does anyone know what the differences are and whether they can be swopped? Thanks again. Peter

[trevinoz]

Peter,
               They can't be swapped  as they have  different indexing apparatus.
  Trev.

[cosmikdebriis]

Ok so... How can I tell the difference from a photograph? I ask because there is one on eBay that looks the same from the... erm... side with the cutouts for the selector forks to fit in to. But no photo of the reverse, which, I'm assuming is the side you refer to as indexing?

Would it be possible to fit a cam plate from a later box along with some other associated parts or do I need the right plate?

[duTch]

Two photos front and back of PLUNGER camplate. Swingarm box has 'gear' type teeth on back, instead of the three 'grabby things...? '
 Inner covers are  different as is correspondingly associated mechanism, but I don't have examples to demonstrate.
 That's best I can do. cheers, duTch

NB this plate for some reason has two 'neutral notches' -?

[cosmikdebriis]

Huge thanks for this as it confirms the one I've seen is the correct one... Whoopee

Only two neutrals... That's not a proper Brit bike box.

[muskrat]

 PO might have tried to make a reverse cam plate. That would be a bugga to use. Gap between 3rd & 4th ain't big, and then to throw in a neutral 
Cheers

[duTch]

Oh yes, I'm hearing you there!! Might as well grind in another one betwixt 2& 3,and make it 'REAL' fun, heck even though I've been running 'round on left foot change for about 25yr, I still get mixed up with feet-L/R/u?p/do?wn..where was I..?? , 3 neutrals'd be ultra- exciting-where's the next ??

   Hey Pete glad to help, didn't realize it was you (but if I had would've done the same!!). Cheers duTch