Author Topic: Swingarm gearbox gears  (Read 902 times)

Offline Tomcat

  • Valued Contributor
  • ****
  • Join Date: May 2011
  • Posts: 400
  • Karma: 2
Swingarm gearbox gears
« on: 09.01. 2016 23:30 »
Tomcat's Ultimate motorcycle is slowly coming together.
I've just dismantled the Super Rockets gearbox to find all the gears pitted, so am looking at possible options.
1/ Buy any gear box that's for sale till I end up with enough good gears  *smiley4*
2/ Post a letter to BSA in Small Heath and order new gears  ;)
3/ Go to a small engineering business and get new gears made  *conf*
4/ http://www.novaracing.co.uk/ProductBSAGoldStarTouring.html  *eek*
5/ Ask all of the lovely folk from the A7/A10 forum if they have any good second hand gears available for sale (hopefully in Oz)  *smile*
Cheers Tomcat

Good Advice
0
No reactions
'48 A7 '59 SR '74 850 Commando TDM900

Offline WozzA

  • Wise & Enlightened
  • *
  • Join Date: Nov 2011
  • Posts: 1317
  • Karma: 17
  • Melbourne Australia
Re: Swingarm gearbox gears
« Reply #1 on: 09.01. 2016 23:49 »
Don't go option #2...   the buggers never reply..  *whistle*
Good Advice
0
No reactions
'51 Golden Flash Plunger
'57 Golden Flash Swingarm

Melbourne
The biggest lie I tell myself is
"I don't need to write that down, I'll remember it"

Online Brian

  • Wise & Enlightened
  • *
  • Join Date: May 2007
  • Posts: 1711
  • Karma: 41
  • Mt Gambier, South Australia.
Re: Swingarm gearbox gears
« Reply #2 on: 10.01. 2016 00:08 »
Tomcat depending on how many of the gears need replacing it may be cheaper to buy another box, provided you can inspect it internally first of course.

NOS gears do come up but usually expensive, like this one for instance.

http://www.ebay.com.au/itm/GEARBOX-LAYSHAFT-SLIDING-GEAR-23T-BSA-A-B-SERIES-GENUINE-NOS-42-3023-/361066449224?hash=item54113cc948:g:QUkAAOSwnDZUKSdR

Have you sent Terry a e-mail, he may be able to help.

http://www.a7a10.net/forum/index.php?topic=10137.0
Good Advice
0
No reactions

Offline BSA_54A10

  • Wise & Enlightened
  • *
  • Join Date: May 2008
  • Posts: 2030
  • Karma: 32
    • BSA National
Re: Swingarm gearbox gears
« Reply #3 on: 10.01. 2016 10:14 »
Goulburn swap is next Sunday for a start.
Mike Riley has stacks of gears and a few boxes to boot but he knows exactly what they are worth.
Most Pommie BSA retailers will have a reasonable range of gears. tht is the beauty of BSA making their own boxes.
Almost any pre-unit BSA box is a source of donor gears, right down to C10 11 & 12.
Good Advice
0
No reactions
Bike Beesa
Trevor

Offline Rocket Racer

  • Wise & Enlightened
  • *
  • Join Date: Jun 2009
  • Posts: 1457
  • Karma: 16
  • A kiwi with a racing A10 rig and too many projects
    • NZ Classic Sidecar Racing
Re: Swingarm gearbox gears
« Reply #4 on: 01.02. 2016 01:21 »
you can add
http://www.ttindustries.com/bsa_gearbox.html to the options if you have deep pockets.

How bad are the dogs? I do have a good supply of reasonable second hand dogs, so can probably supply enough for a reasonable outcome. They wont be new though.
The boxes are quite tough and can cope with wear quite well. Its typically the gear to gear meshing wear on the same shaft between dogs that causes missing gears.

What are your main and layshafts like. The latter typically need attention.

Pm me if you get stuck.
 
Good Advice
0
No reactions
A good rider periodically checks all nuts and bolts with a spanner to see that they are tight - Instruction Manual for BSA B series, p46, para 2.
New Zealand

Offline Tomcat

  • Valued Contributor
  • ****
  • Join Date: May 2011
  • Posts: 400
  • Karma: 2
Re: Swingarm gearbox gears
« Reply #5 on: 09.03. 2016 08:56 »
Goulburn swap is next Sunday for a start.
Mike Riley has stacks of gears and a few boxes to boot but he knows exactly what they are worth.
Most Pommie BSA retailers will have a reasonable range of gears. tht is the beauty of BSA making their own boxes.
Almost any pre-unit BSA box is a source of donor gears, right down to C10 11 & 12.


Thanks Trev for this comment...
Almost any pre unit BSA box is a source of donor gears, right down to C10, 11 & 12
Ive had half a C12 4 speed box for years, taken it to a lot of swap meets and couldn't sell it for $20, turns out the gears in it were in VGC and are now going into my Super Rocket. The rest (NOS)are on the way from Mike Reilly. I owe you a beer. Thank you. TC
Good Advice
0
No reactions
'48 A7 '59 SR '74 850 Commando TDM900

Online chaterlea25

  • Wise & Enlightened
  • *
  • Join Date: Jun 2009
  • Posts: 3314
  • Karma: 47
Re: Swingarm gearbox gears
« Reply #6 on: 09.03. 2016 11:15 »
Hi TC,
THe C gearbox gears does not have the same number of engagement dogs as the A gearbox
half as many means half the strength *ex*
They are also made from a different material,
Late A gears are stamped EN36 which is a good as it gets

HTH
John
Good Advice
0
No reactions
1961 Super Rocket
1963 RGS (ongoing)

Offline Tomcat

  • Valued Contributor
  • ****
  • Join Date: May 2011
  • Posts: 400
  • Karma: 2
Re: Swingarm gearbox gears
« Reply #7 on: 10.03. 2016 06:53 »
Thanks John, I've just had another look and the gears are identical to the S/A A10 gears, and have EN36 stamped on them. So in this case all good. I am now collecting C12 4 speed boxes from swap meets! Cheers TC
Good Advice
0
No reactions
'48 A7 '59 SR '74 850 Commando TDM900

Online chaterlea25

  • Wise & Enlightened
  • *
  • Join Date: Jun 2009
  • Posts: 3314
  • Karma: 47
Re: Swingarm gearbox gears
« Reply #8 on: 10.03. 2016 20:21 »
Hi TC,
Hmmm???
I have a few C boxes but the gears are definitely different to A
Maybe someone fitted A gears to your C gearbox ?? Lucky You *ex*
Comparison of the part numbers would be the only definite way to confirm ????

Cheers
John
Good Advice
0
No reactions
1961 Super Rocket
1963 RGS (ongoing)

Online trevinoz

  • Newcastle, N.S.W. Australia.
  • Wise & Enlightened
  • *
  • Join Date: Jul 2006
  • Posts: 2913
  • Karma: 67
Re: Swingarm gearbox gears
« Reply #9 on: 10.03. 2016 20:24 »
John, a friend of mine has used many C12 gears in his A boxes, he reckons that they are the same also. Not all of them but some.
Good Advice
0
No reactions

Online BVSR

  • A's Best Friend
  • ***
  • Join Date: Nov 2011
  • Posts: 78
  • Karma: 2
Good Advice
0
No reactions
Markku
A7 1961    A10GF 1954    A10GF 1960    A10GF 1961 sidecar    A10SR 1958    A10SR 1959 
A10SR 1960   A10SR -61  A10SR 1963    A10SR 1963   A65T 1968    A65L 1968   B25SS 1971    B31 1952  
B31 1952   B33 1947  B33 1951   DBD34 GS 1958    NSU Supermax 1962    Husqvarna 510TE 1984
Finland[/iu