The BSA A7-A10 Forum

Technical => Frame => Topic started by: manxman on 25.01. 2020 21:12

Title: Superflash
Post by: manxman on 25.01. 2020 21:12
I have aquired a Superflash rigid frame. Any help with what oil tank will  fit the frame with a A10 semi unit motor?
Title: Re: Superflash
Post by: Superflash on 26.01. 2020 06:15
Hi Manxman, is it an A10 SF motor that's going into it? 
Title: Re: Superflash
Post by: manxman on 26.01. 2020 06:52
If  I can find one, otherwise a golden flash.
Title: Re: Superflash
Post by: spanersc on 26.01. 2020 10:05
A rigid Super Flash frame, Hmmm!  Thats intriguing!    I'm not aware that the factory ever produced a Rigid S/F  infact the Super Flash frame number prefix of 'BA10S' denotes that its 'sprung' ie plunger!  The rigid A10/A7's sometimes had an 'R' in the prefix and sometimes nothing but an 'S' is for sprung!  I can only assume someone has attached a rear section from a two piece rigid frame to the Super Flash front section?  Some further information would be interesting. Thanks. Pete
Title: Re: Superflash
Post by: spanersc on 26.01. 2020 10:17
Hi Again.
Sorry, forgot to say in my last post that some photos would be helpful and of great interest. Any chance?
Title: Re: Superflash
Post by: Swarfcut on 26.01. 2020 11:07
     Me neither....According to Roy Bacon the Super Flash was announced in 1953, and used a modified Plunger rear section frame, plus its own unique front section. Super Flash Parts are listed in the '49-'53 parts book, pages 59-61.

   Standard Plunger or "Sprung Frame" numbers include the letter "S" to denote a sprung type frame. No "S" in the number means the frame was originally a rigid. All standard frames  are marked with a year letter, then A7 then S if a sprung plunger type, followed by the frame number. Frame numbers do not indicate whether an A7 or A10 engine was fitted.

 Superflash frame front section is identified by the characteristic swan neck saddle support tube.  This front section is part no 674141. Rear section is 67 4142. Oil tank is 67 8362. This looks very similar to the standard tank used on the early rigid A7, and is larger than the standard plunger tank. B and M series tanks are also worth a look.

 Sorry, but I have no information on frame numbers specifically for the Super Flash, but no doubt the series key will be along soon. BA10S would indicate 1953 year letter, A10 to denote a unique application, and S for plunger sprung rear.

Swarfy. 

Additional. Just noticed the parts list indicates engine steadies to the rear of the motor, the list says other parts are standard A10, so it has both front and rear steadies. Fronts clearly visible on published information, never the rears.

 

 
Title: Re: Superflash
Post by: manxman on 26.01. 2020 11:56
My frame numbers have  a ZA7 R  prefis and the  cocked  center tube  unique to Superflash . Enter superflash in the topic list and you will see others like mine.
Title: Re: Superflash
Post by: spanersc on 26.01. 2020 19:56
Hi Manxman.
 'ZA7R' is the frame number prefix for a cooking A7/A10 rigid between 1949 and 1951, definitely not a Super Flash.
I seem to think that this frame cropped up as a topic for discussion a while back and included some images of the frame with its dog-legged upright.
Title: Re: Superflash
Post by: spanersc on 26.01. 2020 20:02
Hi Manxman.
Have a search and a read of this topic from 2017. I suspect it is about the frame that you now have.

HELP! Frame and Model ID, Rigid A7 Frame w/Super flash dogleg?
Title: Re: Superflash
Post by: chaterlea25 on 26.01. 2020 20:49
Hi
link to topic

https://www.a7a10.net/forum/index.php?topic=11837.msg91014;topicseen#msg91014


John
Title: Re: Superflash
Post by: manxman on 26.01. 2020 22:19
I reviewed the 2017 postings before I bought my frame. Mine is not the one in the pictures or Sluggos. Mine shows no alteration of the  cocked center verticle tube. As far as I can determine the  Superflash is the only bike that had that feature.  If it was  not a original rigid it would not have the  R  in the prefix.  In any  case it is what I wanted !!
Title: Re: Superflash
Post by: spanersc on 26.01. 2020 22:55
Hi again Manxman.
Perhaps some photos might help solve the mystery. There's a lot of knowledgeable folk on this forum. It would be very interesting to solve the dilemma.
Title: Re: Superflash
Post by: Swarfcut on 27.01. 2020 08:51
   A quick looks at Sluggo's frame.  The seat lug appears to be a standard type, with the dog leg/swan neck saddle tube welded to the rear of the lug. My Specsavers eyes think they can see the top of the tube.
 The working drawings published indicate a different, extended lug, with the tube brazed in as normal underneath.

 So the mystery deepens. Sluggo's  looks to be a sort of prototype/race mod and either way, an important link in the development of the Super Flash frame.

Swarfy
Title: Re: Superflash
Post by: BSA_54A10 on 27.01. 2020 10:18
It is worthwhile remembering that more then one BSA special model started life as a bike modified by a race team which if clearly successful became a factory model for the following season.
Remember the comp shop was really only focused on developement of the gold star line.
Title: Re: Superflash
Post by: manxman on 27.01. 2020 12:35
On my frame the verticle tube goes into the lug as normal factory spec. Top and  bottom.
Title: Re: Superflash
Post by: chaterlea25 on 28.01. 2020 19:39
Hi Manxman,
Quote
On my frame the verticle tube goes into the lug as normal factory spec. Top and  bottom.

Only photographs will solve what you have ??

John
Title: Re: Superflash
Post by: MikPowl on 30.01. 2021 16:23
Superflash, I've just spotted your post re- the SF-type frame that you have. I don't know if you've found out any more about it but this may help.  I remember that quite a long time ago one of the classic bike magazines (it may even be the now defunct Motorcycle Sport) did an article on the BSA competition department and their Six Day Trials Team. I particularly remember this as one Fred Rist was pictured on board an ISDT Beeza - Fred ran a motorcycle dealership in Swansea, not far from me, so I took note. Anyway, the whole point of this was that this was before they moved to sprung frames and they'd produced a team of bikes based on the rigid frame with an A7 (or A10?) engine. In order to bang out the G-G's they'd needed to use a TT carb. They could only do this by putting a dog leg into the seat tube to create the space. This was not only explicitly mentioned in the article but was visible from the pics and looked just like a SF frame with a rigid rear end. (I know what an SF looks like as I have one).   I don't know about the rules for ISDT bikes in those days but it's possible that BSA had to make a batch of frames to 'homologate' the bike.  It may be that this is what you have which makes it a far more interesting (and rare) bike than an SF!   Try the BSA-OC library searching for ISDT bikes around 1952~3 and also 'Fred Rist'.