|
|
Does your 
second gear
look like this,
or worse? |
The Douglas 19-tooth mainshaft gear shown here 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!
|
Replace it
with this! |
 |
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.
- - 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.
- - 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 uniformity, purity and refinement over originals.
Here is what you receive:
- 1 x 19-tooth mainshaft gear
- 1 x 18-tooth layshaft gear
$625 US, sold as a pair only.
Packing, postage and insurance
Packing is free. Some typical prices for postage are given below, with optional insurance. These prices are a guide only and may differ with your exact location. Please email me (subject line "SW Gears") if you would like an exact price for your location.
| |
Destination |
Express |
Airmail |
Surface |
Insurance |
| |
|
3 days |
4-7 days |
4-6 weeks |
|
| |
|
|
|
|
|
| |
Great Britain |
US$53.00 |
US$11.00 |
US$6.00 |
US$9.00 |
| |
Australia |
US$59.00 |
US$13.00 |
US$6.00 |
US$9.00 |
| |
|
|
|
|
|
| |
|
Overnight |
Priority 2-day |
Surface Parcel |
Insurance |
| |
United States* |
US$13.00 |
US$6.00 |
US$4.00 |
US$8.00 |
| |
|
|
|
|
|
| |
* Rates vary widely based on distance; those given are to ship coast to coast. |
For availability and queries write to:
Doug Kephart, kephartd@synthes.com Subject line “SW GEARS”
Do not send funds without inquiring first, supplies are limited!
Larger photos for a closer view (click on picture)
|
|
|
|
|
|
|
Close-up , old 19 tooth gear |
Detail, new 19 tooth gear |
New 1st gear clutch |
New 3rd gear clutch |
Positions in cluster |
|
|
|
|
|
|
|
Layshaft assembly showing worn 18 tooth gear |
Detail, old 18 tooth gear |
|
|
|
|
