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Clutch Issue #783964 09/11/19 9:33 am
Joined: Oct 2010
Posts: 42
Velo-Felo Offline OP
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Joined: Oct 2010
Posts: 42
Hello All, just acquired a 57 DBD34 and maiden run out was fine except on return the clutch went slack. First thought it was a broken cable but not that. It has a belt drive kit from George Prew fitted but i'm unfamiliar with the clutch set up or brand that comes with it. No noises from within but feels like the clutch has lost all tension allowing the cable to go slack. I guess i'll have to take the primary cover off to check further but has anyone had any experiences of something similar? Is there a central nut that may have come loose etc? many thanks..
Steve


Current bikes:
1957 BSA Goldstar DBD34
1939 Velocette KSS. Mk2
Previous bikes:
1966 Velo Thruxton
1960 Velocette Venom Clubman
1939 Velocette 350 Mac
1959 Velocette Venom
1998 Ducati 916
1978 Norton Commando 850
various other stuff
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Re: Clutch Issue [Re: Velo-Felo] #783967 09/11/19 10:34 am
Joined: May 2011
Posts: 76
J
JakeH Offline
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J
Joined: May 2011
Posts: 76
we have had this happen on the race bikes two times . first time it was the center nut that holds the clutch on, next time it was the nut on the RH side that locates the main shaft. I suspect its the LH nut on your bike. If it was the RH you would experience some kick start issues. Pull it apart and see! we now lock wire the LH nut and Locktite the RH . hope this helps

Re: Clutch Issue [Re: Velo-Felo] #784004 09/11/19 8:31 pm
Joined: Oct 2010
Posts: 42
Velo-Felo Offline OP
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OP Offline
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Joined: Oct 2010
Posts: 42
Thanks Jake, I just wanted to get a measure of what might be the cause before I pulled it apart, very helpful thank you. I hope it's just a matter of putting it back together and nothing too serious.


Current bikes:
1957 BSA Goldstar DBD34
1939 Velocette KSS. Mk2
Previous bikes:
1966 Velo Thruxton
1960 Velocette Venom Clubman
1939 Velocette 350 Mac
1959 Velocette Venom
1998 Ducati 916
1978 Norton Commando 850
various other stuff
Re: Clutch Issue [Re: Velo-Felo] #784014 09/12/19 1:26 am
Joined: May 2011
Posts: 76
J
JakeH Offline
BritBike Forum member
Offline
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J
Joined: May 2011
Posts: 76
OR its even easier! Maybe the pushrod adjuster under the small cover on the transmission. check that first!! of some of the belt drives have an additional adjuster on the clutch pressure plate. like a triumph . May be one of those !

Re: Clutch Issue [Re: Velo-Felo] #784292 09/14/19 10:09 pm
Joined: Oct 2010
Posts: 42
Velo-Felo Offline OP
BritBike Forum member
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Joined: Oct 2010
Posts: 42
Jake you were spot on, it was indeed the big nut in the centre of the clutch hub come loose. It has a Bob Newby clutch and belt, looks very similar to a Triumph set up. I used some thread lock and also wired it so hopefully it will stay put and no damage has been done.

Running these dry I hear it's a good idea to vent the cover to help cool things.. Not sure if that's really necessary on a road bike?

Anyway, thanks again. Steve.


Current bikes:
1957 BSA Goldstar DBD34
1939 Velocette KSS. Mk2
Previous bikes:
1966 Velo Thruxton
1960 Velocette Venom Clubman
1939 Velocette 350 Mac
1959 Velocette Venom
1998 Ducati 916
1978 Norton Commando 850
various other stuff
Re: Clutch Issue [Re: Velo-Felo] #784566 9 hours ago
Joined: May 2011
Posts: 76
J
JakeH Offline
BritBike Forum member
Offline
BritBike Forum member
J
Joined: May 2011
Posts: 76
Steve, Glad to hear it was an easy fix!!

I have run several for years on the street with no issues. We vent the race bikes, but i think you will be fine on the street..


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