The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => Gearbox, Clutch, Primary => Topic started by: derek taylor on 30.03. 2014 20:26
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only just got the flash got clutch slip.
slips on kicking off and slips when running after 20mls
anyone any ideas ?
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Pushrod clearance.
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Yes, 1st check clearance \ freeplay, adjust "according to the book".
Procedure in the owner manual > http://www.a7a10.net/forum/index.php?topic=454 & in http://www.a7a10.net/forum/index.php?topic=1475.0
If not already done, a general inspection of all parts of the clutch is recommended.
btw... Bike year? Clutch type? nice to have info available (see http://www.a7a10.net/forum/index.php?topic=419.0)
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thanks will check
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if the adjustment is right then next step would be to adjust the springs in the clutch, say wind the adjusters in 2 turns, if you have to take primary case to do that you might as well check the plates are not worn out
come:to:think of it, maybe before doing anything with springs check there is not much oil in the primary chain case?
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Yeah, assuming you have the actuation adjusted about right then you're going to want to try winding the nuts on the springs down. Trick is to get them just enough to avoid slip but not so much you need a gorilla grip.
To my mind it's a PITA because you've got to pull the chain case cover, with it's gasket; and to do that you'll likely be removing from that side the exhaust, footrest and brake pedal.
If you are going in and you don't know the state of the clutch components then I guess you'll at least pull the plates out for a looksee.
My 6 spring started to let go as soon as I'd finished running in and started winding on a bit. I did the adjustment by running with the chain case cover off until I had it right. Then buttoned it all back up.
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done the push rod trick it was a bit tight, after i'd done it kicked it over still slipped but not as much will check oil tomorrow
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Have you overfilled the chaincase? The plates could be oil soaked.
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Hi cyclebutch not everybody needs to remove the exhaust and peg to get the case off.......I have but a mate doesnt cos his exhaust header sits lower.....and his peg is not bent?
and some cases have an access plug for the springs?
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right then have stripped the clutch down (tried atf first but no joy) upon inspection 4 springs one longer than the others looks like someone has tried to stretch them, so ordered some new ones also a set of new friction plates fore good measure, oh and a new gasket
just need to know something do you put the gasket on dry or use some sealer with it ? thanks
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I use Permatex #3 or a very sparing wipe of silastic.
Cheers
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If it did not leak before and had no gasket sealant you may one of the lucky ones and have flat surfaces and not need sealant.
I like a lot of people have to try very hard to make the primary chain case oil tight, I make my own gasket out of 0.8mm thick paper, and use loctite flexible master gasket applied to the both mating surfaces, I also have a couple of case bolts with the heads removed to assist in sliding the case into position without messing up the sealant.
I use rubber washers under the bottom bolt heads as they leak on mine.
I use sae 30 briggs and stratton mower oil in the case mainly as its red and you can see whats leaking!
There are quite a few different ways to seal the case some manage with just silicon and no gasket.
Its important to remove all old sealant without scratching the mating faces, which is why using a gasket with no sealant and just grease is best from a time saving view, if you can get it to seal ok doing that.
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just my luck clutch plates came today along with springs, springs are shorter and clutch plates don't fit,
my basket has 10 slots in it the plates have 7 tags the supplier seems to think someone has fitted a triumph clutch.
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Hey Derek,
I guess there's a lesson to be learnt there but sometimes even correct parts need fettling to make them fit. However, I believe that the Triumph 4 spring clutch was originally fitted from 1958-on but previous owners chop and change bits over a period of time so you need to know the differences.
A parts book is always good to have so you can order your bits by part number. They are available from most spares suppliers or from Ebay. You would probably notice the difference in clutches doing it this way.
I'm sure that you will be able to change your newly acquired parts for the correct items if you've used a reputable dealer but it still doesn't doesn't help when you meet up with this sort of thing.
Good luck,
Beezageezauk.
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thanks i also get a feeling that there should be six plates instead of five.
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FYI:- The parts book states that the 6 spring clutch for the Swing Arm A7 and A10 models should have 5 driving plates and their part number is 65-3857. The part number for the springs is 66-3800.
Beezageezauk.
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clutch is 4 spring friction plates has 10 lugs
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Have a look here Derek;
http://www.degroot-bsa.nl/index.php?route=product/category&path=75
It's got the pictures with dimensions. May be of help identifying what you got/need?
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Cor sorry Derek,
I should have re-read your previous postings and I'm confused now. I don't remember coming across a 4 spring clutch basket with 10 slots. Well, at least not one for a single row primary chain. I'll check all my clutch spares in the morning and do a comparison. I'm pretty sure all my 4 spring Triumph type clutch baskets have 8 slots.
I believe that some A50/A65 clutch plates have 10.
Beezageezauk.
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And in '64-'65 A50/65 BSA had their own 4 spring type that had plates just a tad different. Then went back to the Trihard type. DAMHIK
Cheers
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Hi again Derek,
Well, I checked out my spare clutches today to find that the BSA 6 spring clutch basket has 8 slots and the Triumph type has 10 so I reckon that all you need to do is exchange your new clutch plates for the Triumph type.
Here is an image showing the difference between them with the appropriate clutch plate above each one.
http://i109.photobucket.com/albums/n80/beezageezauk/DSCF4069_zps67b1ea50.jpg
Beezageezauk.
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thanks' that is it yes it is the triumph clutch thanks for the info *smile*
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thanks i also get a feeling that there should be six plates instead of five.
FYI, I've got 6 steel and 5 friction plates on my 4 spring clutch.
First and last are steel. It's light as a feather and never slips.
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thanx for all replies clutch sorted now
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thanx for all replies clutch sorted now
That's good. For the benefit of the inquisitive masses, what was done to it to get it right?
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ha ah yes fitted new set of plates plane/friction and a set of springs its had a triumph t120/140 clutch fitted, used atf oil.