Author Topic: 1950 Model Competition  (Read 6664 times)

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Offline Dave

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1950 Model Competition
« on: 29 Mar 2008 at 21:40 »
Photos courtesy of Richson







Topics about this motorcycle - My Comp model

Offline richson

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Re: 1950 Model Competition
« Reply #1 on: 31 Mar 2008 at 13:10 »
During it's life pretty much everything has been replaced at a some stage, but the frame, forks and hubs are original as far as I know. The engine is from a Mk5, the gearbox is a comp unit but not the original.

The toolbox under the seat should not be there, but is a useful addition.
The frame has been modified - someone once cut off half the seat pillar (I'll get that fixed properly one day).
The front exhaust heat shield is extra, but necessary for me.
The air filter is absent.

Other deviations are minor, and not easily visible from the photos.


Offline roger h

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Re: 1950 Model Competition
« Reply #2 on: 31 Oct 2015 at 12:49 »
Is the rear hub/brake assembly on a Comp, the same as on a Mark?
I know the sprocket is bolted on, as per Plus models, but is the hub the same as a Mark (ie 5"ish flange at each end, wheel spoked to each flange) or does one set of spokes go to the brake drum?
Thanks, Roger

Offline NeilR

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Re: 1950 Model Competition
« Reply #3 on: 31 Oct 2015 at 20:06 »
Hi Roger,

Yes, the sprocket is bolted on as you say, and the rim is spoked to the hub both sides and not to the drum. I think later Dragonfly models had a British hub which had a different arrangement with spokes to drum, but not on a mark or a comp.

Good luck finding a hub if you haven't got one, (I may have a spare), and even better luck finding a drum! I gave up looking and made one recently from a Triumph part.

Cheers, Neil

Offline Daren W Australia

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Re: 1950 Model Competition
« Reply #4 on: 03 Nov 2015 at 07:45 »
Hi Neil what model Triumph and what did you have to do to make it fit I have at least 4 bikes needing drums Regards Daren
too many dougli not enough time!

Offline NeilR

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Re: 1950 Model Competition
« Reply #5 on: 03 Nov 2015 at 13:26 »
Hi Daren,

I used a T120 part:  http://www.ebay.co.uk/itm/REAR-BRAKE-DRUM-TRIUMPH-BSA-/291600505337?hash=item43e4be99f9:g:XHwAAOxy3NBSg3gY#ht_197wt_954

I welded up all the hub mounting holes, skimmed flat on the outside then re-drilled the pattern to fit the Douglas Hub.
Then took a 1.5mm skim off the inside face of the mounting surface to give clearance for the brake shoe pivots. It's a pretty rough casting, so a fair bit of linishing to get the outside smoothish.
Then fit hub, centre up in lathe & skim the friction surfaces.

I machined a sprocket from a blank. There's probably a lot available to fit this pattern but maybe not in the correct width/pitch.

Cheers,

Neil

Offline Daren W Australia

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Re: 1950 Model Competition
« Reply #6 on: 03 Nov 2015 at 20:16 »
Thanks Neil
too many dougli not enough time!