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A7 & A10 Engine
A7 1946-1950
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The BSA A7-A10 Forum
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Technical (Descriptive Topic Titles - Stay on Topic)
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Gearbox, Clutch, Primary
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Mix and Match
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Topic: Mix and Match (Read 468 times)
Norsa1
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Join Date: Oct 2012
Posts: 18
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Mix and Match
«
on:
16.09. 2015 02:46 »
I would like to hang a Norton diaphragm clutch onto the A 10 transmission. I understand the semi unit mainshaft will fit the A 10 box and this mainshaft has the splined end which accepts the Norton clutch hub. Has anyone done this and where do I find a serviceable mainshaft from the semi unit transmission?
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muskrat
Global Moderator
Wise & Enlightened
Join Date: Jul 2009
Posts: 10777
Karma: 130
Lithgow NSW Oz
Re: Mix and Match
«
Reply #1 on:
16.09. 2015 08:44 »
G'day Norsa1.
I have heard the same story but have never seen one. The semi-unit (plunger/rigid) mainshaft will fit in a pre-unit (swing arm) box. Don't know which notrun hub will fit.
But I luv the diaphragm clutch on my A10 cafe.
Cheers
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'51 A7 plunger, '57 A7SS racer now a A10CR, '78 XT500, '83 CB1100F, 88 HD FXST, 2000 CBR929RR ex Honda Australia Superbike .
Australia
Muskys Plunger A7
duTch
Ricketty Rocketty Golden Flashback
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Join Date: Oct 2011
Posts: 4528
Karma: 41
Re: Mix and Match
«
Reply #2 on:
16.09. 2015 09:26 »
Hiya Norsa, I like what you're trying to do, and I think(know) that at least the versions with a
triplex
clutch fit the spline, but they're a different pitch chain (3/8"
-same as plungers)..so you'd have to change the engine sprocket as well...can't remember the chainwheel teeth number, but is more than a Plunger chainwheel and didn't physically fit in a Plunger casing...but they're diffo to a S/A casing...
From another point of view, as a Plunger owner/rider, the Plunger G'box mainshafts are I believe (but may be wrong) in short supply, so if anyone has a goody, they're likely to hang onto it (as I would if I had one)..I've seen new S/A mainshafts/layshafts advertised through reputable dealers- maybe chase that up, or else drill Muskie for more info
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Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
Australia
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The BSA A7-A10 Forum
»
Technical (Descriptive Topic Titles - Stay on Topic)
»
Gearbox, Clutch, Primary
»
Mix and Match