750 Belt drive and clutch spacing washers.

Hi.
I have fitted a belt drive and I was wondering if the clutch basket spacing is critical?
I'm finding it difficult to use a straightedge for measurement and i need to know if that is as important on a belt as it is on a chain driven clutch. Perhaps the belt is more self aligning?
Cheers Hillbone

No instructions?
typically lateral alignment is not required. Only the circlip and clutch location washer 06.0747 are needed. All washers can be omitted.
Parallel shafts are the primary concern.

Dave,
When I was fitting my Alton starter with Norvil belt drive I wondered about checking the shafts for parallelity (not sure what the correct word is), as I could see the belt had been creeping to one side of the crank pulley and onto the keeper plate. But How can that be checked easily? Tight fitting pipes over each to give more length to them?


Cheers,

cliffa.

cliffa said:

Dave,
When I was fitting my Alton starter with Norvil belt drive I wondered about checking the shafts for parallelity (not sure what the correct word is), as I could see the belt had been creeping to one side of the crank pulley and onto the keeper plate. But How can that be checked easily? Tight fitting pipes over each to give more length to them?


Cheers,

cliffa.

Click to expand...

I have a Norvil belt drive and this is the method I use to check alignment.

With the sprockets fitted but no alternator rotor, use two steel twelve inch rules. One across front edges of engine sprocket and one across edge of clutch drum. If you then hold the rulers together between the sprockets you will be able to see clearly if they are lined up or not.

Ian

Hi Ian,
The problem I had is the clutch centre bearing had a lot of play so the basket was wobbling around. The bearing ran smooth, but I do plan to replace it and the clutch centre soon. Hence my interest. However, using your method only the horizontal plane is checked. How about the vertical alignment. Is that less likely to be out of bonk?

Cheers,

cliffa.

cliffa said:

Hi Ian,
The problem I had is the clutch centre bearing had a lot of play so the basket was wobbling around. The bearing ran smooth, but I do plan to replace it and the clutch centre soon. Hence my interest. However, using your method only the horizontal plane is checked. How about the vertical alignment. Is that less likely to be out of bonk?

Cheers,

cliffa.

Click to expand...

Hi Cliffa

I have never checked the vertical alignment or even considered that it could be out. it is set by the accuracy of the machining of the crankcase, gearbox casing and engine plates, so there isn't a lot that can be done to change it.

As the you have discovered, the play in the clutch basket can be a problem .I have found even with a brand new bearing there is a small amount of movement. I think it could be the clearance in the sleeve gear bushes adding to any slight clearance in the bearing. I just set the alignment correctly and keep my eye on how it's going, then tweak as needed. As there is no oil in the chain case it is easy to have a look inside to see how it's going. I presume you have the extra gearbox adjuster on the drive side? It does make life easier.

The good thing is that once you are happy with it you never have to fiddle with it again, unlike a chain. Also the clutch works much better.

Ian

Hi Ian,
Yes, I guess we have to hope they are in alignment, but all the same I'd like to try to check it when I have it stripped. Unless you've had your bike from new who knows what has happened to them in the past.

I do have two adjusters yes.


Cheers,

cliffa.

Cliff a , a lot of PO's who have stripped their bikes for a repaint or repair tend to leave the spacer out of the top gearbox mount Part Number 03-0023 (https://andover-norton.co.uk/en/sho...ounting-bolts-adjuster-countershaft-sprockets) Item 34
If its left out this will tend to bow the cradle when the top gearbox bolt is tightened and possibly cause enough misalignment for you.
FFT
Regards Mike

Thanks Mike, I’ll make sure it’s there.


Cheers,

cliffa.