Gearbox Specialists for Burman CP

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DougJackson
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Gearbox Specialists for Burman CP

Postby DougJackson » Tue Sep 12, 2017 7:35 pm

Hello to you all.
My poor CP gearbox on my 44 WNG has a disconcerting about of play on the main bearing and also the kick-start lever keeps locking at the top of the stroke. I understand that this is all wear and tear on bushes and bearings but I could do with a gearbox refurb.

As the WNG is special in it's choice of 'convoy' ratios (like a 5-speed box with 4th missing!) it not really another option to pick up another CP box either.

So basically does anyone know a capable sort of chap in or around Sheffield or Nottingham (Yorkshire or Derbyshire) who could do this work for me?
I suspect postage will be extremely dear..but further away maybe too..


I know I could have a go at this myself but to be honest I don't really have the confidence or the easy access to lathe.

Thanks in advance.

Doug Jackson :D

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chris.shearwood
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Re: Gearbox Specialists for Burman CP

Postby chris.shearwood » Tue Sep 12, 2017 8:43 pm

DougJackson wrote:I know I could have a go at this myself but to be honest I don't really have the confidence or the easy access to lathe.


Hello Doug,
I don't think one really needs a lathe for a Burman gearbox overhaul. I do remember feeling the exact same way you do now but being cheap and living far away from experts I tried doing the BA box for my Sq4 and quite enjoyed the satisfaction of completing the job successfully. It is not that complicated once you get going and understand how they work. If I remember correctly one of the Forum members put together an excellent step by step guide for this job and there are plenty of capable people on this site willing to help you. Why don't you reconsider and give it a try?
Good luck, Chris
1946 4G, 1950 NG and 1951 VH

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paul.jameson
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Re: Gearbox Specialists for Burman CP

Postby paul.jameson » Tue Sep 12, 2017 8:49 pm

Forgive me for being little old fashioned in this answer but have you thought of joining the Ariel Owners Motor Cycle Club? The Notts and Derby Branch is one of the most active in the Club and stuffed full of people who can help you / teach you / do the job for you.
Paul Jameson
36 4G, 37 VH, 53 ex ISDT KHA (project), 54 KH(A), 54 4G Mk IV (project), Healey 1000/4 (project)
Former Machine Registrar & Archivist, General Secretary and Single Spares Organiser.

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Re: Gearbox Specialists for Burman CP

Postby GuyH » Tue Sep 12, 2017 9:15 pm

Hi Doug, Like Chris I also rebuilt my Square Four box and found it pretty straightforward despite never having done one before. All the bushes, bearings and gaskets are readily available as is advice and spares through the club. It was a very satisfying feeling to feel it snick smoothly into each gear when the restoration was completed and I rode it up the road for the first time.....
1939 600 OHV 4F, 1939 OH 250, 1939 OG 250 project, 1933 MA3 350, 1920 Ariel V twin project and various odds and sods

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Re: Gearbox Specialists for Burman CP

Postby DougJackson » Tue Sep 12, 2017 9:50 pm

Hi Guy and Chris
I'll have a look for the guide but gearboxes do scare me somewhat. Isnt there a lot of measuring and end float shimming?? (I dont know what im talking about...clearly) .I'm not bad with a spanner and since I've owned the Ariel I've fettled the wiring and ignition, sorted the head and valves (lapping and clearences) and pretty much got the bike reliable apart from the ropey gearbox. So it's almost ready for some longer trips.....

Paul...I am a member of rhe AOMCC but as you can see I've not got the bike to point where I could pop down on the bike for a meeting from Sheffield. Arriving in a car is cheating!
I've had many bikes in the last 30 years but this little beast is my first real classic. I used the bike for a few testing runs and actually done 500 miles in the last few months on short runs in peak district and love it's character and it really makes me smile.

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Re: Gearbox Specialists for Burman CP

Postby john.mitchell » Tue Sep 12, 2017 10:04 pm

Perhaps this is the time to remind Forum members who are AOMCC members or become members that if they apprise our illustrious webmaster of the fact, their name will er#ver after appear in a fetching shade of crimson. And better still, the rest of us will know that they are members....
John Mitchell
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DougJackson
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Re: Gearbox Specialists for Burman CP

Postby DougJackson » Tue Sep 12, 2017 10:12 pm

I did see a guide for CP box rebuilding that mentioned use of a fly press, Birmingham drift tool and Reamers. Which all sound like rap artist to me.

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chris.shearwood
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Re: Gearbox Specialists for Burman CP

Postby chris.shearwood » Wed Sep 13, 2017 12:47 am

DougJackson wrote:I did see a guide for CP box rebuilding that mentioned use of a fly press, Birmingham drift tool and Reamers. Which all sound like rap artist to me.


Doug,
Here is the page with Alan Moore's very well done video explaining the operation of a Burman box:

viewtopic.php?f=4&t=6294&p=41287&hilit=Burman+gearbox#p41287

It describes the BA box but the CP is basically the same.
1946 4G, 1950 NG and 1951 VH

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Leejm
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Re: Gearbox Specialists for Burman CP

Postby Leejm » Wed Sep 13, 2017 10:26 am

Doug, don't be put off doing it yourself it's really not that hard at all. If there is anything you are not sure about just ask on here. I'm sure you will have no end of people willing to help. Best of luck Lee
1948 NH, BSA D10 SPORTS. 1953 VHA (project)

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alan.moore
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Re: Gearbox Specialists for Burman CP

Postby alan.moore » Wed Sep 13, 2017 12:23 pm

Doug
Have a look at Simons blogsite where he rebuilt a Burman BA which is basically the same inside as the CP. This should help.

http://ariel-square-four.blogspot.co.uk ... n-box.html

Cheers
Alan
1939 VH Redhunter;1951 Triumph 6T Thunderbird;1970 BSA B175 Bantam;1986 Yamaha SRX600 single
http://cloggymoore.wix.com/triumph-pre-unit-6t


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