Hi all,
any links to an exploded diagram anywhere? I need to find the positioning of BSA part number 154233 "gear control quadrant spacing collar".
Thanks.

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email (option): ahum@quicknet.nl

Hi Kev..it fits onto the gear change quadrant shaft,directly behind the tie rod that joins the footchange ratchet plate to the gear change quadrant shaft. (the left hand end of the tie rod as you face the gearbox)...Ian

email (option): ian@wright52.plus.com

Part number 14 on this picture !
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email (option): viaconsu # planet dot nl

email (option): lee@twowheelstested.co.uk

Piece of cake!

email (option): unpob@yahoo.com

Hello please let me know about the parts 48, 49 and 50 from the illustratio.
Is 49 a rubber washer?

Tavery

48- bearing retaining washer.
49- steel distance washer.
50- oil flinger washer.

Sometimes there are shims between 49 and 50.

Thanks a lot. What type of washer is the oil flinger washer and how important is it? Please share pics if you have one. Gearbox is scaring me.
Tavery

Not scaring you further, but I built my last WM20 gearbox on the bench and had selection "issues" thereafter...............Ian mentioned later that these boxes need to be "timed" when actually in-motion or something like that ?

That's why I attached a crank to the drive side of the box; made adjustments a lot easier...
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The steel oil flinger is important because without it there will be too much endfloat on the main shaft.
All three shafts should have .005" endfloat hence the shims I mentioned in my last post.

Hi Matt, Thanks for the info. Is this oil flinger washer a normal one or is it some special part made of a special material?
Tavery

No special material, just mild steel, although they are slightly dished.

dimensions- .75 x 19.3 x 46.3mm.

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Hi, the mainshaft has a fixed position to the small ballbearing by the kickstartratchet assembly so I would say there should be no endfloat on this shaft at all.

The washers/shims are needed to get the pair of gears in line with eachother and to get the space between the dogs and the gearwheels equal. If these shims are left out, the dogs which have to catch the 3rd gearwheel will not fully engage and probably jump out under load.

Regards, Michiel

email (option): m.wijbenga@hotmail.com

Thanks so much for the pics and dimensions. Sadly for me the shift is very tight. I think I have a wrong bearing retainer washer and not sure of the dimensions of distance washer. Please help me with the dimensions and pics if someone has it handy. It will be extraordinarily helpful.
Tavery

Do you have a gasket between the inner cover and the gearbox shell?

Hi. What is the best way to remove the two pins from their shaft. ( number 30)?

email (option): unpob@yahoo.com

Hans. That is really clever!

email (option): unpob@yahoo.com

Hi Matt, that is very much in place and I used a very thin gasket for this purpose. Just want to know if I used the shims with the right thickness.
Tavery

Hi did some more research from the site. Now here is the dimensions that I have got
Both Part 48 and Part 50 should be approx 0.78mm thick and part 48 is the steekl distance washer which is 2.98mm thick.
It is mentioned that Part 48 sits under the bearing in the inner cover. So is it like I have to remove the bearing to actually see if this shim is in place? or does it fit on the other side of the inner cover?
Tavery

Hi Tavery,

unfortunately you will have to remove the inner cover to see the bearing retaining washer. It sits in the cover behind the bearing.