SQ4 in PRF

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Vincent.vanGinneke
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SQ4 in PRF

Post by Vincent.vanGinneke »

to be auctioned :

SQ4 MkII in swingarmframe

https://www.carandclassic.com/car/C1737674

This unique Square Four has been in the custodian of legendary British actor Sir David Jason and has been one of his prize possessions that he has enjoyed using but feels now is the time to find a new owner of this remarkable Square Four.

Purchased by Sir David over 30 years ago, he took upon the challenge to rebuild it back to its former glory when he spotted an advert in a classic motorcycle magazine for some Ariel spares and also a modification to the Ariel frame to convert it to a swinging arm instead of plunger suspension. Upon meeting the gentleman who put the advert up, it transpired his father worked for Ariel at the factory and when the factory closed, his father acquired the Jig to make the swinging arm conversions as he had been working on the initial concept of swinging arm frames and kept it in his workshop at home. Sir David decided it was the right decision, so he decided to use a donor frame and have a swinging arm conversion made (the original frame comes with the Lot, the original frame number is stamped on the donor frame), fitting the original engine and carried on with the restoration. Within the restoration process, he decided to increase the, in his words, feeble braking power of the original front brakes and fit a Grimeca 4 leading shoe front brake which compliments the looks of the Ariel very well. Upon completion, the Ariel was stored and has rarely been used since restoration so it will need careful recommissioning before returning to the road. An ideal opportunity to own a motorcycle that has been part of one Britians most beloved actors collection. Offered with a V5C.
Offered with key


1957-ariel-square-four-.jpg
Simon.Gardiner
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Re: SQ4 in PRF

Post by Simon.Gardiner »

Del Boy built a Square 4? Wowza!! :D
According to the website, frame number GM 1261 (s/arm frame restamped) engine NML 1243.
Interesting ethics of re-stamping a frame with the number of another frame, which you keep as evidence of...originality?
(In 1982 - when I got new docs for my '56 - you could register a 'change of frame' with a different frame number. Possibly by 30 years ago - 1994 - the DVLA didn't like doing that?)
Someone else will know about the factory connection and assembly jigs... :mrgreen:
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'55 Huntmaster, '56 VH, ' 51 VH, '61 Arrow, '80 R100RT, '00 Sprint ST
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paul.jameson
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Re: SQ4 in PRF

Post by paul.jameson »

I did know of the existence of this bike. I believe that the frame maker has recently re-joined the AOMCC. He still lives in the Birmingham area.

If I was buying the bike (which I won't) I would be wondering whether David Jason's mechanical skills were as good as his acting skills. Do you strip the engine to clean out the sludge traps or not??????????????
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Now Archivist (but not Machine Registrar), Gauges and Clocks Spares Organiser.
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Re: SQ4 in PRF

Post by nevhunter »

Neglecting to properly clean out the sludge traps is NOT a risk worth taking, with the 500 twins or the Sq4. Centrifugal force packs it in there. You can ruin an otherwise good motor and put conrods out the bottom.. Nev
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Roger Gwynn
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Re: SQ4 in PRF

Post by Roger Gwynn »

I think you have to read the description carefully as, if I remember correctly, it doesn't say that the frame was built using factory jigs. It would be unlikely as the only 2 s/arm SQ4 that are known of, that were built by the factory used the front half of a SQ4 frame mated the the rear of a s/arm frame. We have many works drawings for a s/arm frame for the SQ4 dated to pre 1954 and to the same design as the s/arm ones made for the singles and twins, complete with an offset at the rear for the wider chain line.
Roger Gwynn, caretaker of the club's works drawings and machine register, membership secretary 2015-26. Director of AOMCC, Draganfly Motorcycles, Craven Equipment and Supreme Motorcycles mostly retired.
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Vincent.vanGinneke
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Re: SQ4 in PRF

Post by Vincent.vanGinneke »

The 'solution' at the two front down tubes looks just like the frames Graham Horne build.
Is he the builder / creator ?
Swingarm SQ4 German article  (5) - kopie.jpg
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Roger Gwynn
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Re: SQ4 in PRF

Post by Roger Gwynn »

Yes.
Roger Gwynn, caretaker of the club's works drawings and machine register, membership secretary 2015-26. Director of AOMCC, Draganfly Motorcycles, Craven Equipment and Supreme Motorcycles mostly retired.
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