Author Topic: 1940 Real C12 a 350cc version of the C10  (Read 4587 times)

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Offline Owen

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #90 on: August 27, 2018, 11:02:50 am »
Progress on my Lucas 1130 conversion to a MT version. Shortened the original lamp holder base,  now just need to work out a fixing for the lamp holder on the base and get some brass sheet to fill In the lip on the underside or might use a bit of flatt copper pipe.
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 #91 on: November 12, 2018, 07:42:33 pm »
Well I picked up an Amal 75-145 carburetor for the real C12, that is off a B23. It has the extended body to overcome the dynamo. The one thing is the body needs a blanking plug for the back end of the air screw. Anyone know if it is just a plug or shaped to fit the needle?
« Last Edit: November 13, 2018, 09:52:27 am by Owen »
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11
Anyone want a B20 in need of a lot of tlc

Offline timsdad

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #92 on: November 13, 2018, 08:19:31 am »
Martin Bratby is your man, Owen. He supplied all the bits I needed for my Real C12 carb for about fifteen quid  a few yeas ago, making some of the parts himself.

His details are in the appropriate section on here - some time ago but I'm sure you'll be able to muddle through and find them!


Ray
Just a motorcyclist.

Offline MilitaryRon

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #93 on: November 13, 2018, 09:52:50 am »
Martyn is a personal friend of mine (member of our Indian Riders club) He's always at Kempton  (next one is 1st Dec... plus the bike show I think) If you can make it there Owen, I'll introduce you.

Ron

Offline cornish pixie

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #94 on: November 13, 2018, 09:07:38 pm »
Evening all
Just looked at my spare amal pepperpot 75 and 76 and 89, no plug in the air screw back end.
My spare 275s have a plug.
The 75 has been used sucessfully and the 89 is running perfectly on my ajs currently.
You might not need a plug !
Cant see a 275 plug available separately,so would have to make one if required.
Hope this helps
Regards Martin.
 



here in sunny cornwall

Offline Owen

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #95 on: November 13, 2018, 09:48:08 pm »
That's interesting Martin. Maybe it to do with the external/internal air ways of the 75/275 bodies
« Last Edit: November 13, 2018, 10:02:16 pm by Owen »
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11
Anyone want a B20 in need of a lot of tlc

Offline chaterlea25

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #96 on: November 13, 2018, 09:57:54 pm »
Hi All,
On the 1930's 75,76,and 89 carbs the pilot air is drawn in through the "hole"in The photo Owen posted
It must not be plugged !!!!

The story I was told is that the  Military wanted all the air entering the carbs to be able to be filtered if required
So AMAL redesigned the carb so pilot and atomising air is taken through the passage at the bottom of the intake on the
275-276-289 series carbs

John


Offline Owen

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #97 on: November 13, 2018, 10:07:27 pm »
So that confirms the no plug theory and expands my carb knowledge.
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11
Anyone want a B20 in need of a lot of tlc

Offline cornish pixie

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #98 on: November 13, 2018, 10:10:48 pm »
Thanks John
here in sunny cornwall

Offline MilitaryRon

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #99 on: November 14, 2018, 06:02:08 am »
I have at least three 75-76 carbs in my collection and all have no plug in the pilot screw hole. John is correct:- in 1940 the War Office decreed that all bikes that might be going overseas should have a 275-276 carb fitted so that an air filter can be incorporated if needed.  Makes me wonder what Norton were thinking about as they did fit the Vokes tank top filter on some bikes from pre-war with a 76 carb.......I suppose it did help? Ron

Offline timsdad

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #100 on: November 14, 2018, 07:14:10 am »
In my experience, air filters on old bikes are mainly cosmetic. But there again, I've never ridden in a desert - just on the beach at Holme-next-the-Sea, at the end of Peddars Way!


This is very interesting information - thanks, John.



Ray
Just a motorcyclist.

Offline Owen

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #101 on: March 06, 2019, 09:49:49 pm »
Finally got round to some work on the bike. Managed to modify the rear light so it will illuminate the number plate, i shortened the original lamp holder to fit inside the housing. Just need to fit a twin filament or LED lamp holder.
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11
Anyone want a B20 in need of a lot of tlc

Offline Biggles

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #102 on: March 06, 2019, 10:27:57 pm »
Nice work how many hours did this conversion take
1954 C11g
1960 C15
1960 b40 ss90

Offline Owen

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Re: 1940 Real C12 a 350cc version of the C10
« Reply #103 on: March 07, 2019, 01:13:14 pm »
A couple of hours honest work and a nice smile when done.
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11
Anyone want a B20 in need of a lot of tlc