MK III Norton Head steady

I'm looking at the parts books for the MK III with the idea of adding the head steady spring to my '73 but I'm not sure exactly what parts to buy. It looks that the piece that mounts on the cyl head with 3 hex head bolts is the same for both, right? So what parts need to be added to incorporate the MKIII spring? I ASSUME that per the MK III parts book it would be parts 2,4,5,6,7,8, and 9. Is that correct? But does 2 bolt to the part on the 73 that bolts to the cyl head (part number 1). I would post a pic of the page from the manual but I am not "allowed" to copy any portion of the manual (CD).

OK - here it is via screen shot

Not sure, but I don't think the box plate (1) is the same. If you need one, I have it. Sorry, don't have any of the other stuff, just the big part.

MexicoMike said:

I'm looking at the parts books for the MK III with the idea of adding the head steady spring to my '73 but I'm not sure exactly what parts to buy. It looks that the piece that mounts on the cyl head with 3 hex head bolts is the same for both, right? So what parts need to be added to incorporate the MKIII spring? I ASSUME that per the MK III parts book it would be parts 2,4,5,6,7,8, and 9. Is that correct? But does 2 bolt to the part on the 73 that bolts to the cyl head (part number 1). I would post a pic of the page from the manual but I am not "allowed" to copy any portion of the manual (CD).

OK - here it is via screen shot

Click to expand...

Easiest way to post parts book pics is to go to Old Britts.

2 does bolt to 1 but it has to have 2 holes drilled into the front face to take the bolts 3, have done same and thats what needed to be done to my 74 headsteady part 1.

GOT it! Thanks.

Mex,
if you are using a box headsteady like a 73 Mk2 type, you can add the Mk3 angle bracket that holds the tension bolt for the spring trunnion. But, this requires that you drill 2 holes into the front face of the box steady. Remember, the centre line of the cylinder head is about 6mm to the left (primary side) of the centre line of the frame. if you look at a genuine Mk3 headsteady, you can see the 2 bolt holes that fix the angle bracket are offset to the right (timing side) by about 6mm. This dimension is not ultra critical as the dual spring itself allows some lateral play. I fitted on to my '73 850 and noticed an improvement in the isos and a little better steering.

Mick