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#304032 - 03/20/10 7:59 am Norton Clutch Problem  
Joined: Aug 2007
Posts: 88
bbc Offline
BritBike Forum member
bbc  Offline
BritBike Forum member

Joined: Aug 2007
Posts: 88
ohio
Hello Everyone,
I have a 1974 850 Norton Commando. It has a 5 Friction plate Barnett clutch. It will not release the plates all the way. It wants to Pull the bike with the clutch pulled in. I have adjusted it several times at the primary cover. The plates are Not stuck together when I pulled it apart. Your help is greatly appreciated.
Thank you in advance.

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#304057 - 03/20/10 1:41 pm Re: Norton Clutch Problem [Re: bbc]  
Joined: Feb 2008
Posts: 338
Alan Prudhomme Offline
BritBike Forum member
Alan Prudhomme  Offline
BritBike Forum member

Joined: Feb 2008
Posts: 338
FLORIDA
Your clutch operating lever could be out of position or warped plates will cause this. Go to search, there is a lot of info on this.

#304198 - 03/21/10 12:08 pm Re: Norton Clutch Problem [Re: bbc]  
Joined: Aug 2001
Posts: 1,253
Dave Comeau Offline
Crew Chief
Dave Comeau  Offline

Crew Chief

Joined: Aug 2001
Posts: 1,253
Hamilton, Mass. USA
The amount of clutch freeplay is absolutely not critical for the commando.
educate yourself here:
http://atlanticgreen.com/ndnsclutch.htm


dynodave
BSA 3 1961-1963
Ducati 3 1992-2002
Norton many 1951-1975
87 Serv-Equip 100HP MC brake dynamometer,
#304294 - 03/22/10 1:01 am Re: Norton Clutch Problem [Re: Dave Comeau]  
Joined: Jun 2007
Posts: 5,450
HawaiianTiger Online content
BritBike Forum member
HawaiianTiger  Online Content

BritBike Forum member

Joined: Jun 2007
Posts: 5,450
Maui Hawaii
Whilst mine did drag at one time like yours it slipped as well. The culprit was the center drum that had a multitude of notches beaten into it. Some of these drums are hardened and some are not. They're not cheap either but a new hardened one may be the solution to your problem.
Bill


Bikes
1974 Commando
1985 Honda Nighthawk 650
1957 Thunderbird/T110 "Flying Tiger"
Antique Fans: Loads of Emersons (Two six wingers) plus gyros and orbiters.
#304316 - 03/22/10 5:43 am Re: Norton Clutch Problem [Re: HawaiianTiger]  
Joined: Jan 2004
Posts: 3,515
DMadigan Online content
BritBike Forum member
DMadigan  Online Content
BritBike Forum member

Joined: Jan 2004
Posts: 3,515
ca, us
Did you buy the right plates? There are two thicknesses.
By the way, when machining new aluminum clutches I found the Barnett drive (steel, outer notches) plates are slightly undersize compared to the Norton plates so they will rattle in the basket more.

#304431 - 03/23/10 12:23 am Re: Norton Clutch Problem [Re: DMadigan]  
Joined: Aug 2001
Posts: 2,478
Richrd Online content
Richrd  Online Content


Joined: Aug 2001
Posts: 2,478
Springfield Nebraska
common problem. the hub center gets grooved and this holds the plates in position instead of allowing them to slide.

I have tried to file or reshape the spines but it never works so I just replace the center.


Rich (member ThreeMustGetBeers)
"It's not always about going fast. Sometimes it's nice to slow down" (Wendy E.2016)

69 bonney
72 commando
75 commando interstate
06 Suzu..Suzu.. uh appliance
couple of beesas a ducati
and the Snake Bike
#305031 - 03/26/10 4:57 pm Re: Norton Clutch Problem [Re: Richrd]  
Joined: Aug 2007
Posts: 88
bbc Offline
BritBike Forum member
bbc  Offline
BritBike Forum member

Joined: Aug 2007
Posts: 88
ohio
Thanks Everyone


Moderated by  Dave Comeau 


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