Author Topic: 1952 plunger flash clutch  (Read 928 times)

Offline anjimehra

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1952 plunger flash clutch
« on: 02.12. 2015 10:38 »
Hi guys
Greetings from sunny Pune, India
A query regarding clutch. I know the swinging arm clutch sprocket has a friction lining. Should the plunger also have facing on the sprocket?
Am thinking of converting the dry clutch to a wet one using cork facing & removing the clutch housing that keeps the plates dry. Any suggestions please
Anji

Offline duTch

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Re: 1952 plunger flash clutch
« Reply #1 on: 02.12. 2015 11:09 »

 Hi Anji, no it doesn't have the rear friction plate, but it does have one plain plate that is thicker than the others, and that goes at the back of the stack (important).
 The parts book says five friction plates and five plain plus the one thick plain one, but I found four works fine and five of each is too many, as I couldn't get enough spring preload.

 I've never used the cover partly because I initially was experimenting with plate numbers, and wasn't going to be stuffed doing the 12 nuts as well as the rest of the procedure, and it works fine without it.

 There was some discussion about the pros and cons of that not so long ago.
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

Offline muskrat

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Re: 1952 plunger flash clutch
« Reply #2 on: 02.12. 2015 18:49 »
G'day Anji.
As duTch said the clutch can be run wet (cover removed) but I prefer to leave it as is. The cover stops the basket from spreading.
Anyone that has a plunger knows it was the best BSA clutch.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, .
Australia
Muskys Plunger A7

Offline anjimehra

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Re: 1952 plunger flash clutch
« Reply #3 on: 03.12. 2015 07:56 »

 Hi Anji, no it doesn't have the rear friction plate, but it does have one plain plate that is thicker than the others, and that goes at the back of the stack (important).
 The parts book says five friction plates and five plain plus the one thick plain one, but I found four works fine and five of each is too many, as I couldn't get enough spring preload.

 I've never used the cover partly because I initially was experimenting with plate numbers, and wasn't going to be stuffed doing the 12 nuts as well as the rest of the procedure, and it works fine without it.

 There was some discussion about the pros and cons of that not so long ago.

Thanks duTch
Another Query. Will the BB31or A 7  Plunger clutch sprocket fit on the A 10 ? A10 parts very difficult to get here.

Offline anjimehra

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Re: 1952 plunger flash clutch
« Reply #4 on: 03.12. 2015 08:00 »
G'day Anji.
As duTch said the clutch can be run wet (cover removed) but I prefer to leave it as is. The cover stops the basket from spreading.
Anyone that has a plunger knows it was the best BSA clutch.
Cheers
Hi Muskrat
Thanks. The clutch on my A 10 didnt come with the cover on it & was running cork plates in oil. Probably leave it as such. Dont want to get into the hassle of finding / making a cover.
Cheers
PS where are you located currently?

Offline muskrat

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Re: 1952 plunger flash clutch
« Reply #5 on: 03.12. 2015 18:22 »
G'day Anji.
I'm south coast New South Wales, Australia.
duTch is up Brisbane way.
cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, .
Australia
Muskys Plunger A7

Online Greybeard

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Re: 1952 plunger flash clutch
« Reply #6 on: 03.12. 2015 19:58 »
Anyone that has a plunger knows it was the best BSA clutch.

I'm happy with mine

Online morris

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Re: 1952 plunger flash clutch
« Reply #7 on: 03.12. 2015 21:16 »
Anyone that has a plunger knows it was the best BSA clutch.

I'm happy with mine

Count me in... but can't say anything negative about the 4 spring set up in the SA neither.
'58 BSA A 10 SA
'52 BSA A 10 Plunger
'55 MORRIS ISIS
The world looks better from a motorbike
Belgium

Offline anjimehra

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Re: 1952 plunger flash clutch
« Reply #8 on: 04.12. 2015 11:41 »
Cant find a clutch sprocket for the flash, but still looking. Is it true that the clutch sprocket off a unit Triumph 500 / 650 will match up with the clutch centre of the Flash ? but would mean using the friction plates off the triumph as the slots are different . Maybe I can get hold of this sprocket
Cheers
Anji

Offline muskrat

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Re: 1952 plunger flash clutch
« Reply #9 on: 04.12. 2015 18:52 »
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, .
Australia
Muskys Plunger A7

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1961 Super Rocket
1963 RGS (ongoing)

Offline muskrat

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Re: 1952 plunger flash clutch
« Reply #11 on: 07.12. 2015 07:46 »
G'day John.
Would the basket be from another model? It doesn't have the flange and studs for the cover.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, .
Australia
Muskys Plunger A7

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Re: 1952 plunger flash clutch
« Reply #12 on: 07.12. 2015 18:26 »
Hi Muskie,
I really dont know ? it looks as though tha basket and chainwheel have been separated?
Are these rivited together ?? does the flange fit between the parts?
I dont have much experience of the plungers

John
1961 Super Rocket
1963 RGS (ongoing)

Offline duTch

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Re: 1952 plunger flash clutch
« Reply #13 on: 07.12. 2015 20:29 »

 
Quote
....... It doesn't have the flange and studs for the cover.
Cheers
Quote
...... ?? does the flange fit between the parts?

Maybe it's been machined off, should be integral with the chainwheel
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

Offline anjimehra

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