This is the 'short tang' type gearbox kickstarter spring fitted to the 3 Speed Sturmey Archer CS type gearbox, and possibly other early Sturmey Archer gearbox's - both Norton and other marques, this most likely being for earlier, 1920's SV/OHV modelss - but please read all of this description listing - and that of Item 1108 before confirming this is the correct spring for your model - as this pattern is slightly different to the other Sturmey CS type spring we sell (Item 1108), and there were many variations of Sturmey Archer gearbox throughout the 1920's and into the early 1930's.
Price is each.
We used a genuine original Sturmey Archer kickstart spring for the pattern for manufacturing this spring - but this particular spring was found in a box of Sturmey Archer gearbox parts I have owned for many years, obtained from someone who had owned many 1920s's/30's bikes - Norton's being prevelant, but I cannot guarantee this spring originated from a Norton CS gearbox.
However, the original spring did come from a Sturmey Archer CS type gearbox of the 1920's era - and looking at other photographs of CS type gearboxs - it seems most likely that the earlier CS type gearbox used a spring with a shorter tang - i.e. the straight part that came out from the spring coil, with a loop at the end, that was used to loop around the shaft of the kickstart lever of these models.
I have included a photograph of a very original 1925 Model 18 Norton, which was fitted with a CS type gearbox - and looks to employ this 'short tang' version spring (acknnowledgement to www.Bonhams.com - who provide excellent photographs of many original bikes of this era, and are well worth visiting if you are considering buying either a complete bike, or spare parts) - which indicates that this earlier Norton model may have used this gearbox kickstarter spring (Item 1064), rather than our other CS 'long tang' type gearbox spring - Item 1108, which I know was fitted to the later CS gearbox's, into the early 1930's.
This spring is unusual, in that it is has forward facing tang and loop, which fed through a hole in the kickstart spring cover (see accompanyning photos), and then looped behind the shaft of the kickstart lever.
If you own a Norton model (or indeed any other similar aged marque that may have also fitted Sturmey Archer gearbox's in this period), then it is important you also look at our similar Item 1108, as we offer two different type of springs from this era, that although are very similar, have slightly different tang length's, and the spring ends are at different positions - so please check the accompanyning photographs for both listings before ordering - we try to show the exact differences between the two different types, so you can select which looks most correct for your particular gearbox.
When looking at the phtograph that shows the 'clock' position the tangs are positioned at for both springs - it should be remembered that it would be normal to pull the kickstart back (i.e. anticlockwise) slightly, so the kickstart is under slight pressure, even when at the top of its stroke - so take this into account when looking at the spring end positions.
Both this spring (Item 1064) and the other CS spring (Item 1108) have a kickstart spring tang that protrudes outward from the gearbox approximately 20mm, meaning the kickstart lever is very close to the gearbox cover. The later CRS gearbox spring (Item 1065) protrudes out much further, meaning the kickstart shaft protrudes further out from the gearbox end cover than the CS model.
6A final point - I am not an expert on early Sturmey Archer gearbox's (very few people are these days for obvious reasons!) - and have only pieced together the information shown here from looking at many photographs from different models, customers and friends who still have these - and looking at the few Sturmey Archer gearbox spares I own myself. If you think you can provide more information - or own models with other types fitted - feel free to email us on sales@racingvincent.co.uk - we will be happy to update these listings with more information, or add other springs if patterns become available.expert
The length the tang protrudes on this spring is approximately: 26mm (this being the straight section between bend and start of top loop)
The outer diameter of the spring is approximately: 47.5mm
The kickstarter tang protrudes out approximately: 20mm from the main coil spring
This is now an extremely difficult spring to find, and many original gearbox's are likely to be suffering with the original spring worn and tired - this new spring should help revitalise the kickstart lever returning! It is slightly more expensive than later springs, as we have had to pay setup on a smaller size of batch than the later springs - hope this makes sense.
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