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Richard Corcorans Page

The pursuit of excellence in BSA WM20 restoration
 
Restoration from scratch - one dedicated enthusiasts story.

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I have been interested in bikes for several years now. My first bike was an old Honda CB100.
My first British bike was a 1949 BSA D1 Rigid Bantam 125cc. I found it to be a bit too slow, so I looked for something that was a bit more robust and could keep up a bit better with modern day traffic.
 
My next bike was a BSA 1951 M33. After a few years, I decided that I fancied a change, and that's when I became interested in WM20s.
After searching for what seemed like a long time, I finally got one. I bought it in haste. It was a complete bike and had a new olive drab paint job and was running, but when I got it home and had a good look at it, almost every part was worn out.
After almost a year of restoration, it was finally ready for it's MOT.

My first WM20 as it now appears
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I then decided that It would be a nice idea to build a very early model with all the rare hard to find early parts. There are quite a few of the later wm20s but not many of the early examples.
This time I would start from the frame up, and collect the parts as and when I could. Thanks to Ian Wright of Ark Motorcycles for all the infomation and the parts he was good enough to find for me. Also Henk from the WM20 Website who was very helpful with pictures and info. Also, Ron Pier has been a big help with parts and information.
 
I am very close to having all the parts for my early KM20 rebuild and will soon start putting it together. Thanks to Chris and Richard in Birmingham, the site hosts who are straightening the frame for me.
 
I have got a bit carried away with collecting the parts I needed for the rebuild, so I decided to build two instead of one.

Hopefully, you will soon be able to see my progress on the website.and i hope this will be useful to anyone else that is also restoring a wm20.
 
Richard Corcoran

M20proto.jpg

MOD Photos of the M20 type Richard hopes to build
prototype.jpg


Richard recently made from scratch a pair of early pattern BSA KM20 Front footrests, he has been kind enough to share with us how he did it, First just so's you know what Im talking about heres a pic of the actual footrests in WWII

KM20 w/early pattern front foot rests & sump guard
footrests.jpg
German NSKK examining war booty after fall of France

Bottom left corner of the B&W pic above showing German NSKK personnel working their way through piles of abandoned British motorcycles, probably ex-British Expeditionary Force, abandoned after the Dunkirk evacuation 1940.
 
Also the prototype pictures above that show the early footrests too.
 
The procedure:-
Take an original pair of cast military footrests with the cross hatched flat part.
Hold in a  vice cut the criss cross patterned ends off with hacksaw
then file any excess metal off so that the surface is level and smooth

The hacksawed off footrest
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Not much to do but discard this

Centre drilled ready for drilling right through
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13mm diameter hole

Rod inserted flush
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ready for welding or brazing

Rod welded in place
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hole drilled in end of rod & tapped for bolt

Use a centre punch to make a mark where you want to  drill the hole. Drill a hole with a 13mm drill bit, I used a bench drill for this its easier.

Cut the 13mm round bar to the correct length. You get an idea for this by measuring the footrest rubbers and allowing a bit exta for the bar to fit through the hole in the bracket that you have drilled. you can get these replica foot rest rubbers from Jeff Hunter.
 
Now drill a hole in the end of the bar and put a thread in there so you can screw a bolt in, this will hold the foot rest rubbers on with the aid of a big washer.
 
Then place the cut length bar in the hole on the foot rest bracket it should be a nice tight fit If you have done it right and flush with the arm on the inboard side. Nb: Make sure the end with the  threaded hole in is facing outwards
Lastly weld or braze the bar in place

The finished conversion
footrestthreadedendwithbolt.JPG
ready for painting

Red lead undercoated
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rubbers fitted and end retaining washers in place

Theres been some confusion over which
PICT0026.JPG
Footrest rubber is the basis of the project

The type with the round center hole
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are the basis for this conversion

Then clean all the bits up, under coat, paint and assemble.
 
Be careful when buying the footrest rubbers there are a very similar type around that has a winged BSA logo and the center hole is rectangular not round. These are obviously not the type that were used in this conversion.

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