850 MK II Kickstart shiming.

Hi Guys,

I am just looking for opinions as to whether the kickstart shaft on an 850 MK II Gearbox needs shimming? Is shimming required to correct any tollerance issues of the kick shaft to layshaft????
On the old Brits web site..... in the gearbox section it shows a kickstart shaft with a shim, which I imagine is located in between the shafts shoulder and the kickstart shaft bush on the inner cover!
In the Norton parts diagram it does not show a shim in this location.
Also should this kickstart bushs be loctited to prevent excess movement/play.

Brewer

What bearing are you using,if using the roller bearing as on the old britts site it may require shiming to rid exesive slop,the two steel bushes should be tight in the housing so loctite may be your best bet.

Hi Splatt,
Yes! the layshaft bearing is of the roller type.
The layshaft seems to have all these bushes with slight movement, when all of this movement is combined, It contributes to an amount of sloppyness!

Is the sleeve of this roller bearing that fits onto the layshaft have to be a snug fit on the shaft also???? because mine is a sliding fit on the shaft.
I do confess that, I have been having probs with the gearbox slipping out of first gear under moderate acceleration or when underload with a passenger!

Somebody told me that this type of problem can be caused by weak/worn gearchange springs and Hairpin springs?

The gears and dogs look okay, I hope some one can shed a little light on the matter.

I hate it when she misses " first" gear when accelerating from the traffic lights and stuff,

Brewer.

In the 34 years I've owned my MKII I've replaced the first gear bushing twice to fix that problem. There was a thread about this on BritBike also:

http://www.britbike.com/forums/ubbthrea ... Post266996

HTH

Thanks for that link Dave, good info there!
However, what would be the optimum end float for the Layshaft and how do I go about taking the correct/easiest measurments for the calculation of kick start shimming required?


Brewer

Read the old britts assembling a commando gearbox, the pictures should say more than I ever could, but not as much as my wife :!:

When I installed the layshaft roller bearing, I consulted Norvil about end float, and members of my local Norton club.
I settled on 0.010" end float.
You should not reduce the end float to zero in any running conditions, as this would result in the rollers 'binding' on the flange of the bearing, which would reduce the life of the bearing considerably.
I have had no trouble with the operation of the gearbox.

Thank you everybody for valuable advice.

Brewer.