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Clutch Slipping ? #75693
07/07/08 6:31 pm
07/07/08 6:31 pm
Joined: Jun 2007
Posts: 21
Calif
Street Fighter Offline OP
BritBike Forum member
Street Fighter  Offline OP
BritBike Forum member

Joined: Jun 2007
Posts: 21
Calif
Hi guys
On my 1975 Norton 850 MK111 about 200 mi ago I replaced the clutch with factory parts new clutch disks, plates, hub, and clutch cable all at the same time. but the other day I got on it little in 3rd gear from a low rpm and felt the clutch slip a little do you think I should have replaced the spring/pressure plate at the same time maybe it just doesent have enough pressure any more or any suggestions on what it could be.

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Re: Clutch Slipping ? #75694
07/07/08 7:11 pm
07/07/08 7:11 pm
Joined: Mar 2007
Posts: 223
Portland, Oregon
swooshdave Offline
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swooshdave  Offline
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Joined: Mar 2007
Posts: 223
Portland, Oregon
Probably just needs adjusted.

Re: Clutch Slipping ? #75695
07/08/08 1:23 am
07/08/08 1:23 am
Joined: Jun 2007
Posts: 21
Calif
Street Fighter Offline OP
BritBike Forum member
Street Fighter  Offline OP
BritBike Forum member

Joined: Jun 2007
Posts: 21
Calif
Adjustment is right on.
What else.

Re: Clutch Slipping ? #75696
07/08/08 3:54 am
07/08/08 3:54 am
Joined: Mar 2007
Posts: 223
Portland, Oregon
swooshdave Offline
BritBike Forum member
swooshdave  Offline
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Joined: Mar 2007
Posts: 223
Portland, Oregon
Clean the plates?

Re: Clutch Slipping ? #75697
07/08/08 11:18 am
07/08/08 11:18 am
Joined: Oct 2007
Posts: 234
Ohio
Ron Leisner Offline
BritBike Forum member
Ron Leisner  Offline
BritBike Forum member

Joined: Oct 2007
Posts: 234
Ohio
Clean the plates and add one of DynoDave Comeau's clutch rod seals.


Ron L
1973 MkV 750 Roadster
1974 850 Interstate
1975 850 Cafe Racer
1968 750 Fastback
1967 P11
1969 Ranger 750
Re: Clutch Slipping ? #75698
07/09/08 12:59 am
07/09/08 12:59 am
Joined: Jun 2007
Posts: 21
Calif
Street Fighter Offline OP
BritBike Forum member
Street Fighter  Offline OP
BritBike Forum member

Joined: Jun 2007
Posts: 21
Calif
Should the plates have to be cleaned after only a couple of hundred miles on them.

Re: Clutch Slipping ? #75699
07/09/08 11:16 am
07/09/08 11:16 am
Joined: Oct 2007
Posts: 234
Ohio
Ron Leisner Offline
BritBike Forum member
Ron Leisner  Offline
BritBike Forum member

Joined: Oct 2007
Posts: 234
Ohio
The usual cause for slipping with the 850 bronze plates is oil migrating from the gearbox. As the bushings wear the seepage can get worse. So depending on the amount of seepage from the gearbox, the clutch plates can be contaminated pretty quickly. The fiber plates seem to be somewhat less susceptible to this.


Ron L
1973 MkV 750 Roadster
1974 850 Interstate
1975 850 Cafe Racer
1968 750 Fastback
1967 P11
1969 Ranger 750
Re: Clutch Slipping ? #75700
07/10/08 5:06 am
07/10/08 5:06 am
Joined: Jun 2007
Posts: 21
Calif
Street Fighter Offline OP
BritBike Forum member
Street Fighter  Offline OP
BritBike Forum member

Joined: Jun 2007
Posts: 21
Calif
Ron,
I bought the clutch rod seal.
Can the plates be cleaned and reused.

Re: Clutch Slipping ? #75701
07/10/08 8:52 am
07/10/08 8:52 am
Joined: May 2004
Posts: 557
Norway, just south of Oslo
J
jangg Offline
BritBike Forum member
jangg  Offline
BritBike Forum member
J

Joined: May 2004
Posts: 557
Norway, just south of Oslo
Hi there Street F.

Cleaning is ok - do it and empty your primary. Refill prim with SAE 20 type oil (thinner). I use (as many of this board) oil for automatic gear boxes/cases... (Roy Bacon already in the eighties, stated in one of his books "Norton Big Twin Restoration" the need for a thinner oil in primary. A formal deviation from spec so to say).
And put in just below the level mark (the lowest and smallest cap on your primary case).

Said actions prevent drag too.

Good Luck!

regards
jangg


'73 Commando Basket - new aluminium cyl
'93 Ducati 900 SS

"Better lit a light than cursing the darkness"
(Confucius)
Re: Clutch Slipping ? #75702
07/14/08 11:00 pm
07/14/08 11:00 pm
Joined: Aug 2001
Posts: 1,285
Hamilton, Mass. USA
D
Dave Comeau Offline

Crew Chief
Dave Comeau  Offline

Crew Chief
D

Joined: Aug 2001
Posts: 1,285
Hamilton, Mass. USA
Quote:
Originally posted by Street Fighter:
Should the plates have to be cleaned after only a couple of hundred miles on them.
When I ran my combat engine for the first time, I had a new belt drive. After the initial fire up and about a 30 second run, I shut it off and went inside the house.
confused

When I came back out I saw gearbox oil coming down and dripping out of the clutch.

ZERO MILES

That is why I made my clutch rod seal.
Seems like about 3000 more people feel the same as I did.
laugh


dynodave
BSA 3 1961-1963
Ducati 3 1992-2002
Norton many 1951-1975
87 Serv-Equip 100HP MC brake dynamometer,
Re: Clutch Slipping ? #75703
08/15/08 5:34 am
08/15/08 5:34 am
Joined: Feb 2008
Posts: 338
FLORIDA
A
Alan Prudhomme Offline
BritBike Forum member
Alan Prudhomme  Offline
BritBike Forum member
A

Joined: Feb 2008
Posts: 338
FLORIDA
THE MARK3 BLUES....If you still have bronze plates get rid of them. I went through the clean the plates every 200 miles for years...a pain in the ***. I am useing Barnett friction plates now which seem to stop the slipping. you will still have to clean them once in a while to stop clutch drag. Daves clutch rod seal is also a must. Use automatic transmission fluid in your chain case and put your bike on it's sidestand when you fill to the plug.

Re: Clutch Slipping ? #75704
08/18/08 1:20 am
08/18/08 1:20 am
Joined: Mar 2007
Posts: 31
CA
M
mikekane Offline
BritBike Forum member
mikekane  Offline
BritBike Forum member
M

Joined: Mar 2007
Posts: 31
CA
I just replaced the stock 850 bronze plates with Barnetts and got the stack just right. No slippage and a 2 finger affair. I also use this set up on a 750 and run it dry with excellent results. I use type f trans. oil in the 850


Moderated by  Dave Comeau 


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