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For Sale & Wanted
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Please let me know if you have any pre-war M series
parts for sale or wanted.
If you want, I can then add them to this page.
Call back regularly as I update the page.

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New JM24 cylinder barrel
New JM24 cylinder barrel

New 1938 JM24 type cylinder barrels, with small 2 screw tappet cover.
See photos above
Standard 82mm bore
Excellent quality, cast and machined in Birmingham UK
£1500 including postage

click for enlarged view
Ross Racing forged M24 Piston

PISTONS:  New 82mm forged racing pistons for sale - Top quality made by Ross Racing Pistons, California USA.  

These are based on the 1938/39 standard compression M24 piston, but have a shorter skirt, and they will fit all pre-war OHV 496cc M22, M23 & M24 engines. I have STD 82mm and 82mm + 0.020in available, complete with pin, rings & circlips. See photo above.

Price £150 including postage & insurance

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1938-40 NEW UK made finned rear brake drum/ 42T sprocket, as fitted to all M24s, and also 1939 M23 Silver Star, and M20 & M21 Deluxe models. BSA Part No 66-6107. The studs which locate in the hub are 0.3mm oversize, to allow for wear in the hub locating holes. The holes may need light reaming for a good fit.
£120 including Postage.
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Still wanted urgently
:  Pre-war BSA M22,23,24 Rocker box lid with or without breathers
BSA part No 66-342 plain or 66-384 with breathers


Wanted: M22,23,24 Valve Spring top collars, part No 66-274
and Exhaust valve spring seat 66-273

For Sale
  1939 KM24 Tank badges.. excellent
reproductions to original spec...see photo below...
Oct 2013 - now available again
£ 80 per pair plus postage  


Available from me or from Bob Mayow at

***WANTED*** Type 14, bottom feed, 7degree float for a TT carb, or complete carb.  I have a later 1950s alloy type 14 float and various type 302 top feed floats, fixed and remote as possible swaps.
Tel: 00 44 (0)1946 822580 or email

Please Phone me or Email for further details

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Wanted: For 1939 KM23/24 Gold Star or Empire Star
Petrol Tank with instrument panel
Front & Rear wheels/hubs
Girder forks