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.
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 06/20/0512:50 am06/20/0512:50 am
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 06/20/058:48 am06/20/058:48 am
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 06/20/058:52 am06/20/058:52 am
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 11/08/063:59 am11/08/063:59 am
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 11/08/064:04 am11/08/064:04 am