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Heavy clutch action
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janieb
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July 5, 2021 - 11:42 am
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Hi, I've just bought a D14 Supreme.  The clutch action at the lever is extremely heavy.  It has a standard 7/8" -  throw lever blade and everything else is in good condition.  The cable is well oiled and I've taken the clutch apart, put in new old stock clutch springs and new plain plates as the old ones were a bit burred.  The lined plates are in perfect condition and correct thickness and the clutch basket is good.  I've also made sure the grease point is well greased.   I've been told the clutch action should be light "two-fingered".  Any ideas would be most welcome!

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sunny
Norfolk
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July 5, 2021 - 1:40 pm
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sounds  like  not  all  the  cluch  mechanisam   has been  serviced       ,., bantams  are not  an   ezy  fix    id  would  go  throw  it  all  again      and is  part number   90 / 184   the  Bush

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Sponge
Lancashire (A chip shop somewhere near Preston)
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July 5, 2021 - 1:58 pm
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Given all of the above and from my experience I can offer the following easy stuff : 

The little rubber bush inside the clutch cover that protects the push-rod between the clutch worm and the mainshaft end can sometimes be a bit too enthusiastic and will create a heavy clutch action. The original BSA ones are fine but sometimes those who rebuild Bantam engines put a bit of petrol pipe in there with out thinking what effect it will have on clutch action......or they leave it out altogether which is preferrable.  I suggest check it and maybe take it out altogether. If you are not worried about it then just cut it off with a sharp knife.....no need to strip the alternator side covers off. 

Check you have the right sized ball bearing inside the clutch worm........ 

Check that you have not inserted an extra plate somewhere in the clutch......once again easy to do and the result is a very heavy clutch.

Check that you actually have a 4 speed clutch basket in there. IT might be a 3 speed one pretending.....which would also provide an almost impossibel clutch action.    

I would never say that a 4 speed bantam had a 2 finger clutch action but if it is set up right it should be quite a light action clutch. 

If none of the above works then I would be looking at removing the plates and checking that the worm gear and pushrod action is smooth before turning my attention to the clutch springs and finally the basket itself. 

Good luck

Sponge

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Stoo63
GLASGOW
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July 5, 2021 - 2:08 pm
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Hello Jane and welcome to the Cluband the Forum

You will find just about everything you could ever want on the Forum via the FAQs and technical sections;  ** Please log in to view **

Have a really good nose around the forum and enjoy yourself. Looking forward to seeing your progress.

Good Luck!

All the best,

Stewart

 '55 D3 Battery; '58 Square Four (project); '59 D1 direct lighting plunger; '59 Tiger Cub; '60 5TA;  '76 FS1-E; '91 GTR 1000;  '97 Honda Sky SGX50.

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janieb
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July 7, 2021 - 4:56 pm
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Thank you all for your ideas and advice.  We'll certainly look into what's been suggested, starting with the easiest one first. 

All the best

Jane

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Unitminor
Norfolk
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July 7, 2021 - 8:56 pm
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I would agree with Sponge about the rubber Bush I had the same problem with my D3 so I removed it. The clutch was so tight you could not hardly squeeze the clutch lever until the Bush was removed. 

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mike p5xbx
E-Sussex
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July 7, 2021 - 11:42 pm
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I use these rubber bellows on the clutch pushrod (cut to size) and also on the exposed inner cable underneath the engine.
The clutch cable I use also has a nylon lining and I can pull the clutch leaver in with just one finger, admittedly not That easy but its just as light as on any Jap bike i have ever owned

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D? - D10- D14 Bantams 350 AJS -500 Triumph http://bsanotru.....lfire.com/

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Sponge
Lancashire (A chip shop somewhere near Preston)
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July 25, 2021 - 10:41 pm
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Hi Jane, did you manage to sort that clutch out in the end  ?

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