Triumphrat

Mancha · 03-01-2007

Hi All,

Well, I have some IKON fork springs I want to install on my Thruxton. I've used the search tool and the WIKI, and I feel pretty confident that I could now install fork springs if I had a Bonneville. Problem is I have a Thruxton, and I'm not positive that the installation is the same.

The IKON replacement springs are significantly longer than the stock springs. Does this mean that I ditch the spacer, or do I still need to use it, and if so, do I need to shorten (or lengthen!) it?

The Bonnie folks recommend filling the forks to about 140 or 150 mm from the top of the "stanchion" (the identity of which I am guessing at as the top of the fork tube) before inserting the spring. Is this correct for the Thruxton?

Your help is appreciated.

Mancha

Thrux-ton-up · 03-01-2007

Mancha - thrux oil level is 143 mm below the top of the fork tube WITH the forks fully compressed. No spring or spacer installed. Be sure to compress the fork sliders several times to work any air out of the system.

Spring removal - back off preload all the way - then carefully loosen fork cap nut - it may be under a little spring pressure - so be ready.

As far as spacers - you need to match the length of the Ikon to stock. So lay them side by side, spring with spacer on top cut the length of the ikon spacer (if needed) so together with the ikon spring they match the length of the stock spring and spacer. So if the ikon spring is a lot longer than stock then you will need to cut it's spacer to match the stock spacer and spring length. If the new spring and spacer are too long - great difficulty in getting them back in the fork tube will result - and you'll have a bunch of preload already dailed in. Too short and then you may not be able to dail in enough preload with the cap adjusters.

CYNCRZR · 03-01-2007

Ton-up gave you the good info, I've recently installed the IKON springs, I cut the existing spacer down using a Tubing Cutter.

I cut mine to 28mm, some have used 30, but I wanted to be able to screw in the preload adjusters just a little without actually adding any preload.

If for some reason you should ever want to go back, a replacement spacer is like $10.00.

d2mini · 03-01-2007

What about Progressive Springs?
I installed those in my bonnie and no spacer was needed. (even though it stock springs came with a spacer)

Mancha · 03-01-2007

Thanks for the help. I bought some PVC tubing this morning and will use a short section of that as spacer. So my new Ikon with PVC spacer will match the length of the stock spring with its stock spacer.

Thrux-ton-up · 03-01-2007

Quote:

On 2007-03-01 09:53, d2mini wrote:
What about Progressive Springs?
I installed those in my bonnie and no spacer was needed. (even though it stock springs came with a spacer)

Dennis - same thing keep the new spring and spacer (if needed) the same length as the old spring and spacer.