1973 750 Clutch question

captwk · Apr 26, 2012

I have a 1973 Norton Commando 750. I need to replace the clutch. Here is my question. There is 4 friction plates, 5 plain plates, 1 pressure plate. The order they are installed from inner to outer are,

1 friction plate, against the clutch basket surface
1 plain plate
1 friction plate
1 plain plate
1 friction plate
1 plain plate
1 friction plate
1 plain plate
1 plain plate
1 pressure plate.

Is this normal to have two plain plates and the pressure plates all together? What do I need to order? Same setup or different? The clutch was not fully disengaging and the friction disc are worn down.

pete.v · Apr 26, 2012

captwk said:
I have a 1973 Norton Commando 750. I need to replace the clutch. Here is my question. There is 4 friction plates, 5 plain plates, 1 pressure plate. The order they are installed from inner to outer are,

1 friction plate, against the clutch basket surface
1 plain plate
1 friction plate
1 plain plate
1 friction plate
1 plain plate
1 friction plate
1 plain plate
1 plain plate
1 pressure plate.

Is this normal to have two plain plates and the pressure plates all together? What do I need to order? Same setup or different? The clutch was not fully disengaging and the friction disc are worn down.

Last plain plate should be a friction plate. 5 friction 4 plane and a pressure plate.

captwk · Apr 26, 2012

I wonder if the last owner did this to lessen the drag or easy way to fill up clutch basket?

L.A.B. · Apr 26, 2012

captwk said:
I wonder if the last owner did this to lessen the drag or easy way to fill up clutch basket?

Your '73 model probably had the 5 (bronze) friction plate clutch originally which has been replaced with the 4 plate clutch so the extra plain plate was probably added to compensate for the lack of the fifth friction plate.

Is the pressure plate thick (4 plate) or thin (5 plate)?
http://atlanticgreen.com/clutchpak.htm

http://www.nortonmotors.de/ANIL/Norton% ... &Plate=010

captwk · Apr 26, 2012

Thanks for the info. So if I just drop a plain plate and add a friction plate I should be good?

L.A.B. · Apr 26, 2012

captwk said:
So if I just drop a plain plate and add a friction plate I should be good?

I suggest you measure the stack height of the plates you have and compare that with the information given in the atlanticgreen link to determine what parts you need.

More stack height info.
http://atlanticgreen.com/ndnsclutch.htm

captwk · Apr 26, 2012

Thanks again. Great site info.

Guido · Apr 27, 2012

Whatever you do to the last plate, changing it to a friction, you have to have a stack w/ pressure plate that sits flush with the top of the splines on the basket.
The 750 has 4 friction, 850 has 5.
Mine has 5 friction but need an extra plain to bring it to height. Not sure why

L.A.B. · Apr 27, 2012

Guido said:
The 750 has 4 friction, 850 has 5.

According to Norton Service Release N3/28 (Nov. 1972) the 5 bronze friction plate clutch was introduced on the 750 models from serial 212278, also there are no 4-plate clutch parts listed in the 1973 750/850 parts book.

Nortiboy · Apr 28, 2012

L.A.B. said:
Guido said:

The 750 has 4 friction, 850 has 5.

Click to expand...

According to Norton Service Release N3/28 (Nov. 1972) the 5 bronze friction plate clutch was introduced on the 750 models from serial 212278 , also there are no 4-plate clutch parts listed in the 1973 750/850 parts book.

I have seen 3 x 750 manufactured 1973. All had 5 plate (850) clutch and small sump plug.

Cheers

joeboomer999 · Apr 28, 2012

Nortiboy said:
L.A.B. said:

Guido said:

The 750 has 4 friction, 850 has 5.

Click to expand...

According to Norton Service Release N3/28 (Nov. 1972) the 5 bronze friction plate clutch was introduced on the 750 models from serial 212278 , also there are no 4-plate clutch parts listed in the 1973 750/850 parts book.

Click to expand...

I have seen 3 x 750 manufactured 1973. All had 5 plate (850) clutch and small sump plug.

Cheers

as does my 73 750

1973 750 Clutch question

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L.A.B.

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