Front fork jerking on acceleration and deceleration

jbruney · Jul 31, 2019

Right you are...and speaking of tight and solid on the road it's almost time for my morning ride. English bikes are extremely good at communicating, and relay almost everything on their condition through sound and feel.

contours · Jul 31, 2019

Gadge said:
Hi Contours , any update?

Sorry to say no. I was away on vacation all last week and then when i returned I resumed work on the Indian Scout. That's 99% squared away now. I hope to make time for the old Norton soon as I'm getting tired of the speed and power of my '06 Speed Triple.

SteveA · Jul 31, 2019

Danno said:
Since the Iso's were fettled, I would suspect the front, if that's where the movement seems to be emanating from. It's half the width of the rear yet takes most of the stress.

If something 'new' shows up, go back to the last thing that was changed! Just make sure its good before looking elswhere. If that is good...look along the 'chain'. Swinging arm before head steady and then headstock...

If the Isos were bad, and the fix was good, fixing them has probably revealed the next weakness in the 'chain'.

contours · Nov 2, 2019

After a very long delay I decided to suffer through the 40+ mile journey to my local vintage motorcycle shop a couple of weeks ago. The experts eventually found the problem!

It was a combination of issues. First, the rear isolastics needing more adjustment since the last time he worked on it. The more significant issue was play between the "new" rear hub and the swing arm. I had new rims and hubs built by CNW a while back and finally installed them in the Spring of last year. My mechanic determined the stock spacers were inadequate for the new hub and replaced them with thicker ones. He assures me the problem is solved. I will know for sure when I pick it up this afternoon.

baz · Nov 2, 2019

contours said:
After a very long delay I decided to suffer through the 40+ mile journey to my local vintage motorcycle shop a couple of weeks ago. The experts eventually found the problem! It was a combination of issues. First, the rear isolastics needing more adjustment since the last time he worked on it. The more significant issue was play between the "new" rear hub and the swing arm. I had new rims and hubs built by CNW a while back and finally installed them in the Spring of last year. My mechanic determined the stock spacers were inadequate for the new hub and replaced them with thicker ones. He assures me the problem is solved. I will know for sure when pick it up this afternoon.

Hopefully they have resolved the problem for you
I have to say their diagnosis sounds a little odd!
But unless you see things like this for yourself it's hard to judge
Cheers

jbruney · Nov 2, 2019

Hopefully you're going to be saved from being forced to ride a fast powerful bike now. Heh heh.

concours · Nov 2, 2019

contours said:
After a very long delay I decided to suffer through the 40+ mile journey to my local vintage motorcycle shop a couple of weeks ago. The experts eventually found the problem! It was a combination of issues. First, the rear isolastics needing more adjustment since the last time he worked on it. The more significant issue was play between the "new" rear hub and the swing arm. I had new rims and hubs built by CNW a while back and finally installed them in the Spring of last year. My mechanic determined the stock spacers were inadequate for the new hub and replaced them with thicker ones. He assures me the problem is solved. I will know for sure when I pick it up this afternoon.

So the wheel was floating side to side on the axle?!
You need a new mechanic....

contours · Nov 2, 2019

jbruney said:
Hopefully you're going to be saved from being forced to ride a fast powerful bike now. Heh heh.

Yah, that Speedy is not much fun. Seriously though, my Mk3 offers the best suspension of all. A sheer joy to ride around here with so many roads chewed up.

contours · Nov 2, 2019

concours said:
So the wheel was floating side to side on the axle?!

To some extent, yes. It's a non-stock hub and I don't recall being given any advice about spacers.

concours said:
You need a new mechanic....

On the contrary - my mechanic is great! Maybe if I had a better set up and more spare time I might have figured it out. But given the loose feeling I've always experienced up front I probably would have missed it and foolishly spent my time replacing the steering head bearings - to no avail. It sure helps to have another person around to hold the frame while looking for play somewhere.

Front fork jerking on acceleration and deceleration

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