1915 Veteran heavyweight motorcycle Jardine Countershaft 4-speed gearbox with clutch, gear & kickstart levers.
This veteran 4-speed hand-change motorcycle gearbox was produced somewhere around 1915 and was supplied to many of the motorcycle manufacturers of the day. This included makers such as: Abingdon, Burney and Blackburne, Regal Green, AJW, Vin, L & H, Wilkinson, Coulson, McKechnie, Rudge, Ray, Dot, Peters, Monopole, Coventry-Eagle, Metro-Tyler, D’Yrsan, Invicta, and N.U.T.
I imagine the gearbox would be suitable for other veteran motorcycles. It has a 4-bolt mount. The 4-speed countershaft Jardine gearbox was new for 1915. In 1914, they made a 3-speed gearbox. Prior to 1914, Jardine made a 2-speed gearbox. 1915 was also the first time that the kickstart mechanism was fully enclosed within the gearbox casing.
One other design element was new for 1915. It has a combined belt and chain drive. The cork clutch was supplied with a single plate and a double row of corks. According to the original Jardine notes, the gearbox was fine for engines up to 8HP and ideal for sidecar outfits.
Although I mention 1915 as a date for the gearbox, it might be later years. From a little research, it might be useful on machines into the mid 1920’s.
This gearbox is now 108 years old. It’s a bit gnarly here and there. One inspection cover has been hand-made out of a sheet of copper. Some of the fixings for the plates are missing. The lower section of the casing where the kickstart lever enters the case has had some corrosion. It will need some work. BUT…. It all appears to be there. It turns fine. There is a bit of end-play. So, you are buying a gearbox that will likely need a rebuild. At least, it will need a thorough inspection.
The gearbox has a number. the number is shown in the images.
** The image of the cross section is courtesy of “Sheldons Emu” site. **
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