Limited number of newly manufactured second gear pair for the vintage o.h.v. Douglas motorcycle three-speed gearbox. On offer are the 19-tooth mainshaft slider gear and its mating 18-tooth layshaft gear. 
The Douglas 19-tooth mainshaft gear had robust face clutches for first and top speed but used the gear teeth sliding into mesh with the 18-tooth layshaft gear to engage second. Aptly known as ‘clash’ gear change! Over time even in normal usage this subjected the teeth to a tremendous battering, resulting in deformed teeth, noisy operation and eventually a destructive tendency to jump out of second gear under load. Replacement gears have not been available for a very long time. Until now and only in very limited numbers, get your set while you can!
• Suitable for UG, TG, and YG prefix gearboxes.
• As used in OB, Dirt Track, Speedway, I.o.M./TT, and certain other models.
• Direct replacements for the original gears in form, fit, and function. Including the slight 2-degree undercut on the face clutch dogs.
• Gear hobbed 9-diametral pitch stub tooth form. Precision Wire Electrical Discharge Machine (EDM) cut internal splines. Surface finish and tolerances exceed originals.
• Made from premium vacuum melt Timken™ steel. Nickel-Chromium-Molybdenum alloy, 8620 AISI/SAE spec. Superior metallurgic uniformity and purity over originals.
• Case hardened 0.035 deep with a surface hardness of RHc 58 as per original. Core hardness of RHc 36 for excellent shock resistance. Cryogenic tempered at -300°F to a full martensitic structure in the case for enhanced wear resistance and release of residual stress in the core. Superior metallurgic refinement over originals.
• Shipped treated with industrial corrosion inhibitor.
$625 US, sold as a pair only. Packing, postage, and insurance extra.
You can download a PDF color brochure of the above with some additional pictures via the following link (may take up to 30 seconds via dial-up 56K modem.)
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