Two Questions

Previously wrote:

Previously wrote:

Hi, can anyone tell me the correct stem diameter for slimline yokes?

Also the dimensions of a slimline tank as I don't want to buy a lightweight one in error.

Thanks Keith

Hi Keith, as far as I am aware the only difference between the wideline and slimline yolks is the distance between the fork leg centre lines, (wideline 7", and slimline 7" and from 1964 7.5") while the stem diameters remained the same. The Navigater and Electra had the same yolks as the Dominators. and the Jubilee and Commando yolks were completely different. The 7.5" wide top yolk had the addition of a steering lock on the top yolk, a slight difference at the bottom of the fork leg, (I think that only one was altered) to accomodate the extra width, and a longer wheel spindle. I have an old wideline bottom yolk and if I can find it I'll measure the stem diameter and post another message,

Regards, Rob Gittins.

Thanks Rob, I would be most grateful if you could as I have two pairs of long roadholder yokes and neither fit my headstock bearingsand the stem is a larger diameter than the hole in a sidecar top yoke that I've also got. It's just that I'm looking to buy a set of solo yokes and don't want to buy the wrong ones agian.

Regards Keith

Previously wrote:

Keith,

First off, Norton fork yokes for featherbed heavy twins never had 7.5" centers for the stanchions, they were 7" through 1963, then a bit after they changed them to 7 3/8", anyone with a few sets in their hand can tell you this with a ruler.

Next, I measured the diameter of the stem on three sets of yokes for you with my vernier caliper and the diameter on the stem where the lower fork bearing seats is .984", and that is also the diameter of the upper fork bearing adjuster nut because both the upper and lower bearings are the same.

Overall length of the stem measured from where the bottom of the bearing seats on the lower yoke to the top of the threaded part of the stem is 8 3/16".

Along with widening the fork centers around 1964, AMC also changed the type of thread around the same time, so the adjuster nut and fork crown locknut from one of the Birmingham Bracebridge street Nortons of around 1962 and earlier, will not properly screw onto the fork parts used by AMC once they ran out of original Norton parts and started to make and use their own.

The yokes I measured were off a 59' Manx, a mid-sixties Atlas

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Thankyou all for your help,it is most helpfull. I now know the correct questions to ask prospective sellers.

Thanks agian