BSA B31 Timing Inner Cover

[ramwing7]

I set out to replace the speedo drive bushing and what seemed to be a simple task suddenly isn't.  It seems as if some goober has totally destroyed the retaining pin that holds it in.
If I remove the inner timing cover will I be able to get to the bushing and replace it?

If the answer to that is yes, the next question is how do you get the thing off?
So far I've only found two screws toward the back that seem to hold it on.  That doesn't seem right.

In the attached pic, what must come off to get this plate off?  My parts manual leads me to believe that the shifting mechanism stays in one piece.  Do I remove all the kickstart mechanism?
My shop manual says refer to a BSA dealer.  Those folks are far and between these days.

Any and all help will be greatly appreciated.
Thanks.

[chaterlea25]

Hi,
I havn't bee on here for a while so apologies
Get the relavent BSA service sheets first of all
To get the inner gearbox (not timing) cover off You will have to strip down the clutch side and remove the clutch centre adaptor. This requires a threaded puller.
Once that is off then the complete gear cluster, minus the high speed gear will slide out once the screws are removed.
Taking the speedo drive and layshaft apart is a bit chicken and egg
Once the retaining pin is removed, then the spindle bush must be pulled up and out and then the drive spindle removed before the layshaft will release from its bearing bush.

Its been a while since I had on on the bench ? so I am trying to remember if its possible to remove the inner cover and leave the innards in place by removing the kickstart ratchet mechanism?
My method of assembly is to fit everything to the inner plate and slide the complete cluster into place.
Any excess end float in the shafts or selector drum will cause mayham!!!
Shimming has to be done very carefully in order for the sliding dogs not to get too close to the gears that are not in play or in neutral.. Having the box fixed on a bench vice with the rear cover removed is best.
The linkage pins and ratchet gearchange claws must not have any wear and it is a delicate balance to get every thing correct.. 
A friend was knocked off his plunger B31 and bent the gear lever a touch, but it must have distorted something, as it would not select third-top
I spent hours and days swopping bits about and still unsure how it finally came right.. Theres very little in the books on how to "" fix these buggers" when problems arise

https://draganfly.co.uk/product-category/bsa/sparesparts-for-bsa-a710-b3133-c101112-m202133/engine-
gaskets-gearbox/gearbox-abcm/b-m-group-1938-62-plunger-rigid/

John