The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => A7 & A10 Engine => Topic started by: NickSR on 27.08. 2011 22:01

Title: M & F Crankcase Stamping
Post by: NickSR on 27.08. 2011 22:01

Hi Everyone

M & F stamped on Super Rocket crankcase, whats the meaning.

Thanks
Nick

Title: Re: M & F Crankcase Stamping
Post by: RichardL on 28.08. 2011 00:42

Well, there is this: http://www.mafcobell.co.uk/   (a.k.a. M&F Components). They've been around since 1946, so maybe they changed from motorcycle service to parts along the way.

Richard L.

Title: Re: M & F Crankcase Stamping
Post by: MG on 28.08. 2011 08:17

Malice and Frustration???

Title: Re: M & F Crankcase Stamping
Post by: a10 gf on 28.08. 2011 09:53

No idea about M&F, but am admiring the engine condition, looks like new straight from the factory!

Not to hijack your topic but started looking for stamps, is this (see pic) a production date inside the primary?

Title: Re: M & F Crankcase Stamping
Post by: muskrat on 28.08. 2011 11:18

I'd say so e. My '51 has a stamp in the same spot 17-8-50 and an X where the MF in question is. My newly acquired '64 A65 has CF stamped on the inner timing cover. Would guess that they are inspection signatures.
Cheers

Title: Re: M & F Crankcase Stamping
Post by: trevinoz on 28.08. 2011 21:37

   Nick,
                   I suspect that they are inspection marks.

     Trev.

Title: Re: M & F Crankcase Stamping
Post by: RichardL on 28.08. 2011 21:50

But Trev, if they were inspection marks, wouldn't some of our bikes have identical or similar markings in the same place? Mine doesn't. If they were for inspection, for example, for "Machining and Finish" of the cases, you'd think there would be identical. If they were for "Mike and Frank", you'd think there was a "Dickie and Tom".

Richard L.

Title: Re: M & F Crankcase Stamping
Post by: jfligg on 29.08. 2011 01:32

Hi Fellas
  I have 2 1960 engine cases 1 stamped M and 1 stamped F.  Nothing on any other cases.  I haven't cchecked the plunger cases for dates.  Ill do that tomorrow.  Jeff

Title: Re: M & F Crankcase Stamping
Post by: bsa-bill on 29.08. 2011 08:41

M = made on Monday
F= made onFriday

M F  started Monday morning  finished Friday afternoon (could be problem bikes these ones)

Title: Re: M & F Crankcase Stamping
Post by: muskrat on 29.08. 2011 10:43

Bill I got one built on Sunday by the cleaners. *eek*

Title: Re: M & F Crankcase Stamping
Post by: MG on 29.08. 2011 14:57

The alloy parts on my Shooting Star are all stamped "SS" and with a funny symbol (The mechanic formerly known as Prince?)  *dunno*

(https://www.a7a10.net/forum/proxy.php?request=http%3A%2F%2Fimg823.imageshack.us%2Fimg823%2F4872%2F29082011054.th.jpg&hash=77b00eb822e239eab6fc344eacee4b3a6e041e40) (http://imageshack.us/photo/my-images/823/29082011054.jpg/)

(https://www.a7a10.net/forum/proxy.php?request=http%3A%2F%2Fimg233.imageshack.us%2Fimg233%2F4854%2F29082011055.th.jpg&hash=8894a74b0af784f046118cb767e8f27dea272b08) (http://imageshack.us/photo/my-images/233/29082011055.jpg/)

(https://www.a7a10.net/forum/proxy.php?request=http%3A%2F%2Fimg546.imageshack.us%2Fimg546%2F2986%2F29082011053.th.jpg&hash=e73fda7638533dc0cfa5bb0927456df7f192bc87) (http://imageshack.us/photo/my-images/546/29082011053.jpg/)

Title: Re: M & F Crankcase Stamping
Post by: jfligg on 29.08. 2011 21:19

Hi MG
  I have a friend who was a biker from the 60s.  He marked all of his pieces with his name, he used this as a thief prevention.  I have a named rocker box.  Jeff

Title: Re: M & F Crankcase Stamping
Post by: trevinoz on 29.08. 2011 22:32

Richard L,
                    Swinging arm crankcases all seem to have "F'" stamped on the camshaft tunnel until about 1962 when a circular mark was used.
I have seen some with no marks, possibly polished or ground off, and some with names etc.
   Trev.

Title: Re: M & F Crankcase Stamping
Post by: MG on 30.08. 2011 07:24

Quote

I have a named rocker box.  Jeff

What's its name then? Rocky?  *lol*