General => Douglas Motorcycles - General Discussion => Topic started by: psjc on 16 Jan 2017 at 17:32

Title: Douglas tapers
Post by: psjc on 16 Jan 2017 at 17:32
Am trying to rebuild a 1914 two speed 2.75 HP Douglas gearbox without clutch before the Pioneer Run - too much work too little time as usual. Have two questions which the joint expertise should have no problem with please.
1. What is the included angle of the taper on the output shaft of the gearbox, I.e. The belt pulley and is it the same as the large sprocket taper into the box?

2. Several people have told me that the writing on the front hub has to read in a particular direction to be fitted the right way round. Being a twit I failed to note it on disassembly. Any thoughts please?

3. Knee cartilage given up the ghost last week- Am I being over ambitious n thinking the Dougie will get me to Brighton with a duff knee?

Many thanks in advance

Shaun C
Title: Re: Douglas tapers
Post by: Doug on 16 Jan 2017 at 21:44
See this post: (

Title: Re: Douglas tapers
Post by: Chris54 on 23 Jan 2017 at 11:05
Hi Shaun

Question 3, definitely get you there with dodgy knee, i do it with a dodgy hip that needs replacing, my 1914 2 3/4 out performs me. doing the run this year on 1911 model D.

Title: Re: Douglas tapers
Post by: cardan on 24 Jan 2017 at 04:57

Re number 2: Chater Lea hubs are similar to Douglas hubs, and their instructions are clear: fit the hub to the frame so that the bearing cup tends to TIGHTEN as the wheel rotates about the axle.

This seems a bit counter-intuitive to me, and I had my CL hub fitted the other way, reasoning it was better for the bearing to loosen rather than tighten. Bad idea. It did loosen and jammed the hub between the fork!

Make sure the lock rings are nipped up tight and use a drop of loctite.

Title: Re: Douglas tapers
Post by: veikko1 on 24 Jan 2017 at 07:57
I read this very interesting. I have 1914 model too, and both hub locking ring are missing. Can I get any drawings of them, that we can do it? Maybe Pioneer Run too.
Regards veikko1
Title: Re: Douglas tapers
Post by: graeme on 26 Jan 2017 at 09:20
Sound advice there Leon - and I have found out the hard way also that the hubs have to fitted the correct way around, and yes the lock rings need to be tight even when fitted the correct way! Thankfully no real damage done when the bearings worked loose, except for taking off the new nickel plate  :(