Author Topic: clutch  (Read 1250 times)

Offline Tone

  • Brighton UK
  • A's Best Friend
  • ***
  • Join Date: Nov 2008
  • Posts: 157
  • Karma: 0
clutch
« on: 11.08. 2009 21:35 »
Hi All, I am reassembling the clutch on my swinging arm A10, it's got a triumph 4 spring non cush clutch. What I would like to know is, (without the plates in) when the centre nut is on tight how easy should the centre move? because I can move it by hand but it is quite tight,I put the lock washer on first, then the washer with the scooped out bit on the inside then the nut with the turned down bit inside so it goes through the washer, is this right? Cheers Tone.

Offline LJ.

  • Peterborough UK.
  • Wise & Enlightened
  • *
  • Join Date: Jun 2006
  • Posts: 1403
  • Karma: 15
  • The Red A10!
    • LJ's Website!
Re: clutch
« Reply #1 on: 11.08. 2009 21:45 »
The clutch centre should not move at all... It is on the mainshaft taper and should have a 'woodruff' key in the slot, the nut should be tight and tab locked over. In fact it should be difficult to take off and requiring a puller to remove it.
Ride Safely Lads! LJ.
**********************
1940 BSA M20 500cc Girder/Rigid- (SOLD)
1947 BSA M21 600cc Girder/Rigid-Green
1949 BSA A7   500cc Girder/Plunger Star Twin-(SOLD)
1953 BSA B33  500cc Teles/Plunger-Maroon
1961 BSA A10  650cc Golden Flash-Blue
1961 BSA A10  650cc Golden Flash-Red

Offline Tone

  • Brighton UK
  • A's Best Friend
  • ***
  • Join Date: Nov 2008
  • Posts: 157
  • Karma: 0
Re: clutch
« Reply #2 on: 11.08. 2009 21:55 »
Sorry LJ, I didn't explain it very well, it is tight on the shaft what I meant was you can twist the centre section (shaft included) whilst the chainwheel stays still.

Offline RichardL

  • Outside Chicago, IL
  • Wise & Enlightened
  • *
  • Join Date: Nov 2007
  • Posts: 4937
  • Karma: 46
Re: clutch
« Reply #3 on: 11.08. 2009 22:52 »
Tone,

If I understand you correctly, if you are in neutral, it should turn easily, rotating the unengaged shaft of the gearbox. Shift into gear and see how it feels. If you are on the center stand, and the chain is running to the rear wheel sprocket, the rear wheel should move with a bit of strong hand turning of the clutch center.

Richard
Plan on signing up for the world-wide 2017 DISTINGUISHED GENTLEMAN'S RIDE on September 30, 2018. Watch website at https://www.gentlemansride.com for details.

Offline Joolstacho

  • Valued Contributor
  • ****
  • Join Date: Jan 2010
  • Posts: 447
  • Karma: 3
Re: clutch
« Reply #4 on: 30.01. 2010 11:02 »
This might be a silly question but...
Any reason we couldn't run a 'dry' primary chaincase, using modern O-ring chain on the single row primary?
An occasional squirt with sticky chainlube, no oil needed, the clutch should get enough general 'haze' unless you're doing lots of city work.
?

-Jools
(More silly questions to come)

Online bsa-bill

  • Wise & Enlightened
  • *
  • Join Date: Mar 2006
  • Posts: 5341
  • Karma: 61
Re: clutch
« Reply #5 on: 30.01. 2010 11:38 »
a friend tried this with a standard chain, result was the chain got too hot, might work better with a modern chain but I would think you would still need some form of cooling like drilling your case or an air scoop somewhere.
Worth a try if you have a spare chaincase outer.

All the best - Bill
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Online muskrat

  • Global Moderator
  • Wise & Enlightened
  • **
  • Join Date: Jul 2009
  • Posts: 8022
  • Karma: 106
  • Lake Conjola NSW Oz
    • Shoalhaven Classic Motorcycle Club Inc
Re: clutch
« Reply #6 on: 30.01. 2010 11:54 »
G'day Jools, the other problem would be the clutch bearing running dry. Unless modified with a modern sealed bearing.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

Offline 1660bob

  • A's Best Friend
  • ***
  • Join Date: Sep 2009
  • Posts: 110
  • Karma: 1
Re: clutch
« Reply #7 on: 30.01. 2010 12:04 »
EEEK !-No,don`t run a primary chain dry-There is a fundamental difference here-it is spinning  MUCH MUCH faster than a rear chain and will quickly overheat (It already has to cope with a hot environment), as well as vital lube, the oil transfers the heat generated by the chain back into the casings and thus to atmosphere, a cooling function that your chain lube cannot do, and oil obviously will re-penetrate the roller links at every opportunity-again your chain lube cannot do this.Rear chains at best are in a hostile environment and "get by" due to their relatively low speed, they are a compromise of cost over engineering(theoretically all bikes should have a nice, enclosed shaft that road grit cannot get at-but again its cost.Thus to expose your primary chain so is a recipe for disaster IMHO.OK  yesteryear on Manx Nortons  for racing where they were replaced often/every race and fully exposed to aid cooling-even then (famously) snapping all too often!Bob.