Author Topic: 1940 Real C12 a 350cc version of the C10  (Read 4588 times)

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Offline timsdad

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #30 on: January 30, 2018, 05:36:11 pm »
The C12 head steady mounts from a cylinder head bolt onto the left hand side of the frame and I made mine to sort of look like the one pictured in the parts book. In practice, there is only one place where it could actually go.

We have to remember that those pictures are just pre-production artist's drawings and not photos of actual bikes.

Draganfly used to supply a clutch centre to use the later roller bearings on the early tapered BSA gearbox main shaft - I expect it's that they're referring to, Owen. These have been around a long time, they probably pre-date Draganfly, as I discovered one in my B31 a few years ago. I've owned that since the '70s and didn't know it was in there - never had to pull the clutch centre off in about thirty thousand miles!


Ray
Just a motorcyclist.

Offline farmer58za

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #31 on: February 05, 2018, 10:49:46 pm »
Hi All
I had a "Real C12" a number of years ago, in South Africa. I'm sorry to say I sold it along with a pile of C10/C11 stuff  :-[. I'm sure it's still out there somewhere...

All I had was a frame/forks, saddle petrol\oil tank engine and gearbox.  Engine number was WC12-104.

Regards
David

 
Dave's not here man!

Worcestershire, U.K.

Offline MilitaryRon

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #32 on: February 06, 2018, 06:05:51 am »
Well that was a SA bike. The frame number would have been WC10 3346 and despatched to (looks Like) E Hochne & co in Bloomfontain on 3 April 1940. Ron

Offline Owen

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #33 on: February 27, 2018, 09:44:30 am »
Does anyone Have a clutch drive plate centre with studs from a B29 or M20, 21 or M23 that they could measure the side height. The original c10/c11 one is too short for the extra plate.
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11
Anyone want a B20 in need of a lot of tlc

Offline MilitaryRon

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #34 on: February 27, 2018, 01:36:49 pm »
Do you mean the 'Empire Star' single spring clutch Owen? And No 83 in this sketch? I think I have one in my spares box.  Or do you mean the pre war 6 spring clutch models. Thinking about it now I guess you do.   :-[ Ron
« Last Edit: February 27, 2018, 01:58:56 pm by MilitaryRon »

Offline WDC10s

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #35 on: February 27, 2018, 05:02:02 pm »
Owen,

Have you found a clutch drum yet? I think I have a C12 one in the garage.

Offline Owen

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #36 on: February 27, 2018, 05:25:12 pm »
It's a B23delux or C12
And still looking for one
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11
Anyone want a B20 in need of a lot of tlc

Offline hoppe30

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #37 on: March 06, 2018, 12:24:38 pm »
Owen,

Although I can't measure it but I would like to think that a post war B31 drum would do the trick. I may still have one.

Kind regards,
Leon
1930s BSA nut
C11 1940
Trying to collect all BSA 1936 models, currently still missing: B3, R17 and Y13.

Offline Owen

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #38 on: March 06, 2018, 05:49:58 pm »
Thanks Leon,
However Peter has found me a correct chain wheel which needed to be 17mm depth from the sprocket to the end of the basket. I'm going to get one of the B31 clutch centres and cut it down.
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11
Anyone want a B20 in need of a lot of tlc

Offline Owen

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #39 on: March 08, 2018, 09:00:28 am »
Interesting to find out the real C12 had a twist grip and the 45/6 C's still had the Amal quick throttle.
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11
Anyone want a B20 in need of a lot of tlc

Offline MilitaryRon

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #40 on: March 08, 2018, 09:19:07 am »
Well this is something I'd never noticed before! The "quick throttle" just a lever I assume, appears on the 1940 Civy C10 but the C11,C12 and military bikes all seem to have a twist grip. Ron

Offline Lilyloodles

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #41 on: March 08, 2018, 10:11:25 am »
Just a thought Ron/Owen but wouldn't that made it easier to maintain 'out in the field' maybe

Tony

Offline MilitaryRon

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #42 on: March 08, 2018, 11:27:12 am »
You would think so Tony. You absolutely would not want to replace an internal pull throttle cable by the roadside :-\ Ron

Offline Owen

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #43 on: March 14, 2018, 07:20:48 pm »
I tried FWT thoughtons for the valves but no joy.  Looks like plan B. Find the sizes an see what fits!
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11
Anyone want a B20 in need of a lot of tlc

Offline Cosmikdebriis

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #44 on: March 14, 2018, 08:08:38 pm »
I tried FWT thoughtons for the valves but no joy.  Looks like plan B. Find the sizes an see what fits!

When I wanted some valves for a 1924 Sunbeam 600cc engine I ended up with some from a tractor! The stem sizes were larger diameter so I just bought valves, guides, springs, caps and collets for virtually next to nothing and turned down the outside of the guides to fit.

Moral of the story, don't confine yourself to motorcycle valves, It's surprising what's out there if you Google long enough.
A bike on the road... Is worth two in the shed...