BritBike Forum logo
BritBike Sponsor BritBike Sponsor BritBike Sponsor
BritBike Sponsor

BritBike Sponsor

BritBike Sponsor
BritBike Sponsor BritBike Sponsor BritBike Sponsor
Jwood & co JRC Engineering dealers Jwood & co
Home | Sponsors, Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons, "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Member Spotlight
kboyd
kboyd
Kansas
Posts: 1,115
Joined: June 2004
Show All Member Profiles 
Shout Box
Search eBay for motorcycle parts in following countries
Australia, Canada, France, Holland, Italy, United Kingdom, USA
Random Gallery photo
Who's Online Now
33 registered members (bill50cal), 342 guests, and 474 spiders.
Key: Admin, Global Mod, Mod
Newest Members
Biscuits, DT 150, DamienE, vietnammotorbike, Lennart Liljedah
10291 Registered Users
Top Posters(30 Days)
Stuart 93
Lannis 66
Mori55 64
Popular Topics(Views)
637,880 mail-order LSR
Forum Statistics
Forums34
Topics67,396
Posts654,324
Members10,291
Most Online3,995
Feb 13th, 2017
Like BritBike.com on Facebook

Previous Thread
Next Thread
Print Thread
Rate Thread
Alternate Commando swing-arm? #63348
06/19/05 10:32 pm
06/19/05 10:32 pm

A
Anonymous OP
Unregistered
Anonymous OP
Unregistered
A


Has anyone done/seen a swing-arm from another brand adapter for Commando use (like big late-model UJM)?
Any sites showing Commando frame mods for handling (not isos, but structural changes)?
Any input appreciated.

BTW: my new guestbook may (?) be working:
http://victorylibrary.com/guestbook/addguest-brit.html

Support Your #1 BritBike Forum!

Check out British motorcycles for sale:
British Motorcycles on e-Bay UK, British motorcycles on e-Bay North America
Check out British motorcycles for sale:
British Motorcycles on e-Bay UK, British motorcycles on e-Bay North America
Re: Alternate Commando swing-arm? #63349
06/20/05 12:22 am
06/20/05 12:22 am
Joined: Oct 2004
Posts: 243
Seattle, WA USA
Dr_Hiller Offline
BritBike Forum member
Dr_Hiller  Offline
BritBike Forum member
Joined: Oct 2004
Posts: 243
Seattle, WA USA
Panic:

Great question. I've seen some late-model box-section aluminum swingarms mated to Featherbeds (though my memory has failed me as to which web-sites they were on)- but no C-do's.

For my part, I've done a MkIII conversion that includes a number of substantial improvements over the earlier units. Most notably, the MkIII has dual locating cotters and is more robust all the way around. Though you need to switch to a MkIII cradle and a number of other small items - its a pretty much a bolt in swap.


Unfortunately, the MkIII is a heavy mild-steel job that could stand to be copied in 7005-Al or 4130 cro-mo. Its a lot more weight than really needs to be hanging off those twin-shocks.

Very curious to see if there are other reasonable options out there.

Take care,
david


Ride safe,
David
--------------------------

1971 Norton Commando (parts bucket mongrel)
Re: Alternate Commando swing-arm? #63350
06/20/05 12:50 am
06/20/05 12:50 am

A
Anonymous OP
Unregistered
Anonymous OP
Unregistered
A


Thanks, I'm roughing out a potential project (non-Brit motor) and the C-do looks like a bargain compared to the f-beds for sale. It appears that much of the handling vagaries may go away if 1 of 2 things is done:
1. proper iso fit (as found in http://www.vintagenet.com/phantom/wsc.html ), or
2. no isos at all - simply substitute aluminum bushings where needed.
I need a longer wheelbase, and a longer Suzuki etc. swing-arm from a drag bike looked like a good idea but may not be do-able.
Can you tell me the width of the plates where the pivot goes through?

Re: Alternate Commando swing-arm? #63351
06/20/05 8:48 am
06/20/05 8:48 am
Joined: Jan 2004
Posts: 1,106
McKellar,Ontario
Kommandokenny Offline
BritBike Forum member
Kommandokenny  Offline
BritBike Forum member
Joined: Jan 2004
Posts: 1,106
McKellar,Ontario
The manual for the 850 says the distance between the rear plates is 221.99mm-222.50mm. I believe Fair Spares has developed a new needle bearing swing arm.I can't get on the site right now but I think thats where I saw it .kk


If Norton made an airplane,would you fly in it?
Re: Alternate Commando swing-arm? #63352
06/20/05 8:52 am
06/20/05 8:52 am
Joined: Jan 2004
Posts: 1,106
McKellar,Ontario
Kommandokenny Offline
BritBike Forum member
Kommandokenny  Offline
BritBike Forum member
Joined: Jan 2004
Posts: 1,106
McKellar,Ontario
Dave, is that a gunfighter seat?, and can you email me a picture of the bike with the seat on.
Corbins site just shows the seat not much of the overall installed view. Thanks, kk


If Norton made an airplane,would you fly in it?
Re: Alternate Commando swing-arm? #63353
06/20/05 12:16 pm
06/20/05 12:16 pm
Joined: Dec 2003
Posts: 23
Ohio
P
Pat fribley Offline
BritBike Forum
Pat fribley  Offline
BritBike Forum
P
Joined: Dec 2003
Posts: 23
Ohio
There is a couple of alloy swing arm manufacturers in England that make one for the Commando. Its either JMC or Mechamax. I saw one at one of the bike shows that I was at!!!!!!!!!!!!!

Re: Alternate Commando swing-arm? #63354
06/20/05 12:23 pm
06/20/05 12:23 pm
Joined: Oct 2004
Posts: 243
Seattle, WA USA
Dr_Hiller Offline
BritBike Forum member
Dr_Hiller  Offline
BritBike Forum member
Joined: Oct 2004
Posts: 243
Seattle, WA USA
Kenny/Panic,

The 221-222mm width is the distance between the frame plates where the rear iso mounts to the frame through the engine/gearbox cradle.

I have my old MkII cradle and swingarm at the shop and will measure it up with the calipers for you today.

Take care,
david

PS: Yep, Kenny, its a gunfighter. Here's a close-up:


Ride safe,
David
--------------------------

1971 Norton Commando (parts bucket mongrel)
Re: Alternate Commando swing-arm? #63355
06/21/05 12:46 am
06/21/05 12:46 am
Joined: Feb 2005
Posts: 625
Winter Springs, FL
Tom Sanders Offline
BritBike Forum member
Tom Sanders  Offline
BritBike Forum member
Joined: Feb 2005
Posts: 625
Winter Springs, FL
Clubman Racing sells a Commando swing arm with bearings instead of bushings. I don't know the weight or material. They're asking about $400 if memory serves.


LONG LIVE LOCKTITE

74 Roadster 880cc
1962 Norton 650SS
75 Ducati 860GT
1968 Commando Fastback SN 126157
1975 Honda CB400f AHRMA racer #842
email addy: sargehopp@gmail.com
Re: Alternate Commando swing-arm? #63356
11/06/06 10:17 pm
11/06/06 10:17 pm
Joined: Sep 2006
Posts: 3
Upton, MA
Deckard Offline
BritBike Forum member
Deckard  Offline
BritBike Forum member
Joined: Sep 2006
Posts: 3
Upton, MA
I'm in the process of doing this MKIII cradle-swingarm into my 71 Commando. The MKIII cradle has no slots for adjusting primary tension with transmission. Did you cut slots into cradle & drill hole for banjo to install in your Commando?
I'm going to go with a belt drive, double banjo for adjustment so I'll be drilling a hole anyway


"Everybody wants to go to Heaven,
Nobody wants to die"
Re: Alternate Commando swing-arm? #63357
11/08/06 3:59 am
11/08/06 3:59 am
Joined: Feb 2004
Posts: 1,956
Flint,Mich
norbsa48503 Offline
BritBike Forum member
norbsa48503  Offline
BritBike Forum member
Joined: Feb 2004
Posts: 1,956
Flint,Mich
Panic , I saw a mono shock swing arm fitted to a Commando at mid-Ohio about two years ago painted red the frame was. Anyway the man had preserved the transmission cradle by welding on a hump towards the back. Hung out for hrs to talk to the owner he never showed, maybe some one knows the bike or and the owner. It was a well done piece and seemed to still work as a Commando. Will this bike compete or just whip on street boys.


norbsa
1960 TR6
1963 Super Rocket
1965 650 Star
1966 441
1968 Thunderbolt
1969 Twinkle 250
1972 Fastback
1974 Roadster
1970 S.S
Way too many BSA's not named
http://decentcycles.com
Re: Alternate Commando swing-arm? #63358
11/08/06 4:04 am
11/08/06 4:04 am
Joined: Feb 2004
Posts: 1,956
Flint,Mich
norbsa48503 Offline
BritBike Forum member
norbsa48503  Offline
BritBike Forum member
Joined: Feb 2004
Posts: 1,956
Flint,Mich
Doc Hiller, How about some pics with road dirt on that ride? Some broke in or broke down latest Dy no reports. Have ya gone through a rear tire yet? Dragged a foot peg? Broke any parts?


norbsa
1960 TR6
1963 Super Rocket
1965 650 Star
1966 441
1968 Thunderbolt
1969 Twinkle 250
1972 Fastback
1974 Roadster
1970 S.S
Way too many BSA's not named
http://decentcycles.com
Re: Alternate Commando swing-arm? #63359
01/09/07 2:29 am
01/09/07 2:29 am
Joined: Jan 2007
Posts: 171
Somewhere in New Jersey
blimey-bill Offline
BritBike Forum member
blimey-bill  Offline
BritBike Forum member
Joined: Jan 2007
Posts: 171
Somewhere in New Jersey
I got a stainless steel spindle and modded it and the cradle to make the whole set-up a little sturdier. I have a braced swingarm, but not the MKIII type. It seems to work pretty well.


'67 BSA Spitfire
'68 Commando Fastback
'75 T160 Trident
'02 Moto Guzzi LeMans

Moderated by  Dave Comeau 


Home | Sponsors | Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons | "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Powered by UBB.threads™ PHP Forum Software 7.6.1.1