Douglas Motorcycle


Your Douglas Photos
Dirt Track Racing Photos

On Road Douglas Photos

About this Site
About the Parts
Engines Frames
Cylinders Tanks
Cyl Heads Wheels
EngineParts Flywheels
Carbies Exhausts
Gearboxes Guards
Casings SmallParts1
Sprockets SmallParts2
Electrical SmallParts3
Footchange More Parts
Triumph 250
Site News
Search this Site
Old Classifieds
Douglas Parts For Sale
Douglas Parts Wanted
New classifieds
Douglas Parts For Sale
Douglas Parts Wanted
Douglas Motorcycle Forums
Privacy Policy

600 EW Headstock Bearings

by Doug Kephart

On the 600cc EW Douglas and its descendents, with the double taper roller bearing headstock, direct bearing replacements may prove impossible to obtain. Unless you are fortunate to find some old stock on a shelf, these bearings are long out of production. Time came to replace those on my F-28 model Douglas and I had to find an alternative.

What I used was a Timkin #44649 (cone) and #L44610 (cup) taper roller bearing. These had the proper inner diameter but were a lighter duty bearing with a smaller outer diameter and not quite as high. Since they have quite a few more rollers packed in than the original bearings, the roller contact area equaled or exceeded the originals. So the load capacity was equivalent to the original, and would hold up well.

Douglas EW motorcycle headstock bearings

Adapters to the dimensions above are required to increase the outer diameter and the height. The original upper and lower headstock bearing cones races were different, though the cup races were the same. Resulting in different ASSEMBLED heights. As the same new bearing is used top and bottom, the difference is allowed for in the adapters.

© 2002 D. Kephart




All the content of the website is copyright 2000-2007 by except where otherwise indicated.

All rights reserved. No reproduction, retransmission or distribution in any form of any of the content is allowed without written permission.