Author Topic: C11g Correct parts?  (Read 514 times)

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Offline Pete Thomas

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C11g Correct parts?
« on: January 30, 2019, 04:36:29 pm »
I have just bought a BSA C11g 1955 model with 4 speed gearbox. Apart from being painted black and not maroon it all seems good.

 I have been trying to find out if it has the correct front mudguard fitted. There is no rib down the middle like a 1954 C11 I had 40 years ago. The rear is clearly correct and deep valanced hinged.

 The tank has been painted and no chrome on the sides. Will need to investigate but were they all chrome sides in 1955?

The speedometer fitted is 0 to 85 but just one odometer no trip - is that correct? Also has the flange on the chrome ring to fit a rubber mount.

A little rust on the rear rim but otherwise all is good.   I have tried to find some details pictures of C11g's which show some close up details but there are very few on the web.  Any one got any close up photos of a 1955 C11g plunger 4 speed?   Having a sort out in the workshop I found a few not needed spares, C11 aluminium round points cover x2. also distributor for early 3 speed C11 , rocker shaft.

Is there a photo library of C11's  year by year for reference?  If not would it be something members would value?

Looking forward to comments and guidance.

1946 C11
1955 C11g
1942 WDM20
1944 WDM20
1955 B33
1966 Tiger 90
1968 Starfire
1978 Honda CB550

Offline Owen

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Re: C11g Correct parts?
« Reply #1 on: January 30, 2019, 05:56:08 pm »
Looking at the parts manual it does not show a rib in the centre of the front mudguard and only one part No. So would guess not. I know the pre 54 bikes did have a rib.
The correct Speedo is the Smiths S433/1/L which would have had a trip.
« Last Edit: January 30, 2019, 06:42:09 pm by Owen »
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11
Anyone want a B20 in need of a lot of tlc

Offline Pete

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Re: C11g Correct parts?
« Reply #2 on: January 30, 2019, 06:58:08 pm »
Hi Pete,
Welcome to the site.
Click on the Gallery button above or follow this link https://bsac10c11c12.co.uk/smf/gallery/ Lots of pics to look through there. It is work in progress, so not in dated order or anything.
Pete
"BSA C10 C11 C12 Badges For Sale"

1948 BSA C11
1932/56 C12Rudge

Offline sidevalve

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Re: C11g Correct parts?
« Reply #3 on: January 30, 2019, 07:19:42 pm »
Just a thought re the speedo - BSA seemed to be a bit cavalier in what they used - bit of a parts bin lottery I suspect. My M21 had a 120mph speedo !! and it was as far as I could discover the original. Round / half round and in your case trip / no trip - it might not be what the brochure said but it really might be what the bike started out with

Offline Pete Thomas

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Re: C11g Correct parts?
« Reply #4 on: January 30, 2019, 07:53:02 pm »
Thanks Pete for your  comments re photos.

 I did go through the gallery and couldn't really see what I wanted to.
It appears that most C11g 154/55 had an odometer and a trip milometer.  I thought those without were possibly military versions. Nice to know that the front mudguard is correct.  Monoblock carb standard fitment?
1946 C11
1955 C11g
1942 WDM20
1944 WDM20
1955 B33
1966 Tiger 90
1968 Starfire
1978 Honda CB550

Offline timsdad

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Re: C11g Correct parts?
« Reply #5 on: January 31, 2019, 07:03:25 am »
I have an oily-rag C11G that's pretty much original, Pete, and not a million miles from you if you want to see one in 3D - I'm just north of Diss, in South Norfolk. Mine's an early '54 but, apart from the direct oil feed to the rockers and chrome tank trims, the bikes didn't change much in spec during their short production run. There are several pictures of my old nail in the Calendar Gallery section at the top of your screen. As far as I remember, mine has ribbed mudguards and I'll check later. I don't think either of my mudguards have been off the bike since it left Small Heath.

As has been pointed out already, speedo supply from Smiths seems to have been a bit sporadic so it could have had a round or half-round instrument fitted. There were no notes in the original build ledgers what was fitted when I looked so I guess they just assembled them with whatever  was on the shelf. I very much doubt, though, it would have had a flanged bezel because these were only on the nacelle mounted speedos. Also, all post-war Cs had a trip meter fitted as far as I understand but I may be wrong on this.


Ray
Just a motorcyclist.

Offline Pete Thomas

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Re: C11g Correct parts?
« Reply #6 on: January 31, 2019, 09:11:56 am »
Hi Ray,
Thanks for the  reply. It seems that they came out from the factory all slightly different.  The 54 C11 I had in the 70's had ribed front guard and an oil feed to the rockers. The 55 just bought has smooth front guard and no oil feed to the rockers. I suspect the speedo is a mis match. No trip suggests to me its up to the late 40's unless military. With a flane it must be post war nacelle type. All a bit odd. May be I should swap the speedo to my WDM20 which has a trip speedo assuming the ratios are the same!!
1946 C11
1955 C11g
1942 WDM20
1944 WDM20
1955 B33
1966 Tiger 90
1968 Starfire
1978 Honda CB550

Offline hampshirebiker

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Re: C11g Correct parts?
« Reply #7 on: January 31, 2019, 09:26:10 am »
I didn't think the rocker oil feed came in until half way through C12 production. Probably a modification.
Postal - Liphook Hants - But just into West Sussex.

Offline timsdad

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Re: C11g Correct parts?
« Reply #8 on: January 31, 2019, 11:49:40 am »
The rocker feed came in part way through C11G production.

The '55 registered one you've got now, Pete, may be an earlier produced bike than your previous one, therefore explaining the rocker feed differences. 1954 model bikes were built between about October 1953 to October 1954, which is the period the rocker feed was added, and the '55 C11Gs were built from Oct '54 to the start of C12 production. Often they kicked around at the dealers before being registered.

Any bike that's been re-registered with an age-related number plate could have only an approximate year of manufacture because the folk that were authorising the details a few years ago often didn't have much of a clue.


Ray
Just a motorcyclist.

Offline Pete Thomas

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Re: C11g Correct parts?
« Reply #9 on: January 31, 2019, 05:03:51 pm »
Thanks Ray, The bike has the original number not age related. Registered 1st July 1955.
1946 C11
1955 C11g
1942 WDM20
1944 WDM20
1955 B33
1966 Tiger 90
1968 Starfire
1978 Honda CB550

Offline hampshirebiker

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Re: C11g Correct parts?
« Reply #10 on: January 31, 2019, 05:26:16 pm »
If the '54 bikes had the rocker oil feed why did early C12s not have it? Did BSA remove it and then reinstate it for the '57 models?
Postal - Liphook Hants - But just into West Sussex.

Offline Pete

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Re: C11g Correct parts?
« Reply #11 on: January 31, 2019, 05:56:39 pm »
Bottom of this link implies all C12's had the update, but it was available as a mod on earlier models. https://bsac10c11c12.co.uk/smf/engine-service-sheets-75/lubrication-system-all-models/
Just saying.....
"BSA C10 C11 C12 Badges For Sale"

1948 BSA C11
1932/56 C12Rudge

Offline hampshirebiker

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Re: C11g Correct parts?
« Reply #12 on: January 31, 2019, 06:09:03 pm »
Thank you Pete, so the earlier bikes have been modified by the owners. I can confirm that my '56 C12 does not have a rocker oil feed.
Postal - Liphook Hants - But just into West Sussex.

Offline Pete

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Re: C11g Correct parts?
« Reply #13 on: January 31, 2019, 06:32:09 pm »
Does that mean yours has got an earlier motor, or the update has been removed at some time......we will probably never know.
Late C11G's may well have had the update if the 2 models were produced side by side for a short period, as they shared the same engine.
The only way we will ever know is if we knew what engine number they made the change? But even that wouldn't prove anything, because BSA used what they had.......
"BSA C10 C11 C12 Badges For Sale"

1948 BSA C11
1932/56 C12Rudge

Offline hampshirebiker

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Re: C11g Correct parts?
« Reply #14 on: January 31, 2019, 06:48:17 pm »
Pete, the engine no. is 31709, so definitely C12. Removal of the oil feed is unlikely, so we'll probably never know for certain. I have a C12 handbook dated Apr. '57, which shows the feed. Would be interesting to check an earlier handbook. They don't normally reprint unless there's a modification. Biggles had the bike first, I wonder if he can remember if the feed was present.
I've only persued matters this far because the site should be a reference to accurate information.
Postal - Liphook Hants - But just into West Sussex.