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21
Technical / Re: What does the speedo in tank coil bracket look like?
« Last post by grsymes on August 16, 2017, 12:57:14 PM »
I know the 11G frame has a tab just behind the steering head for mounting the coil, what did you do on the 11 frame, photo?
22
Technical / Re: What does the speedo in tank coil bracket look like?
« Last post by timsdad on August 16, 2017, 07:39:32 AM »
You are right, Owen, as Lucas changed the design of their coils over the years so altered the bracket too. I have older and newer coil brackets kicking around but just gave a short answer rather than the spiel we sometimes get from others.

I still think the steel plate base of a fuel tank is not a sensible mounting point to hang a heavy coil and, no doubt, BSA discovered that too so changed the mounting point. My early Cs have all had broken studs on repaired tank bases with the coil mounted somewhere else.


Ray
23
Technical / Re: a new c11 ? Curious tank ?
« Last post by Owen on August 15, 2017, 10:30:23 PM »
It's probably a late 1952 bike but built as a 53 model. BSA ran their model years from August to the following July.
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Technical / Re: What does the speedo in tank coil bracket look like?
« Last post by Owen on August 15, 2017, 10:27:45 PM »
All the original Lucas coils I have seen on C's had a fixed mounting strap on the coil that did not need a thin pinch bolt. I thought the pinch bolt was a later design?
My C's have a bar across the coil mounting pisition with the two studs which have been OK for the coils on my bike. The only thing I do differently is to mount the coil facing backwards.
25
Technical / Re: a new c11 ? Curious tank ?
« Last post by c11 on August 15, 2017, 07:55:02 PM »
Thank's for thoses informations. engine number is BC11.5309   and frame number is ZC10S4 1195  .

in roybacon book  frame number begin by ZC are for 1952 , but speedo on fork are for 1953 so 1952 or 1953 ??


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Technical / Re: What does the speedo in tank coil bracket look like?
« Last post by grsymes on August 15, 2017, 04:30:16 PM »
Ok, I'll try that. thanks
27
Technical / Re: What does the speedo in tank coil bracket look like?
« Last post by timsdad on August 15, 2017, 04:20:27 PM »
It fits the standard Lucas coil mounting bracket, that wraps round the coil and clamps it with a thin pinch bolt, which was used on most coil ignition cars and bikes up to about the 1980s. If you really want to use this mounting point, Mr g, then you just need to sandwich the bracket between a couple of pairs of 1/4" large flat washers before adding the spring washers and nuts.

However, this original period mounting is only really fit for using on a display bike because the base of the fuel tank is not a suitable place to hang a heavy coil from. It's safer to bolt it under the tank rear frame mounting, where it looks the part, or strap it to the frame front down tube.


Ray
28
Technical / What does the speedo in tank coil bracket look like?
« Last post by grsymes on August 15, 2017, 03:04:56 PM »
On the underside of the speedo in tank type tank there are two short threaded studs. I presume this is where the coil is mounted. My question is this: what does the bracket that holds the coil look like?
29
Technical / Re: C12 muffler/silencer
« Last post by Richard Whitfield on August 14, 2017, 11:48:13 AM »
Sent photo of silencer to Amours who have confirmed that the indentation is there on purpose.  That's good news as I won't have to send it back now.  Big thanks to all the really helpful replies. 
30
Technical / Re: C12 muffler/silencer
« Last post by donkey on August 14, 2017, 08:49:25 AM »
I have an A7 plunger silencer on my c11g plunger and it fits perfect on the front pipe/main stand indentation and the hanger point
donkey
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