Lowering USD fork?

[JohnK]

Working on a Cafe Project and came across some cheap parts from a wrecked Hypermotard 1100, I have salvaged the mono rear swing with wheel and there is no problems there, but I am concerned about the front Hypermotard forks being too long for my Honda Sevenfifty (Nighthawk)

As I already have front wheel, triple clamps, rotors and calipers I would very much like to use the fork, but I am thinking about replacing the fork tubes and find some from a Ducati superbike that fits my triple and the lower axle and caliper holder.

Question is, is this part removable and can it be fitted to a similar fork with the same inner pipe diameter?

EDIT: havnt got the front parts yet so I havnt had the chance to measure anything.

 

[J-Rod10]

Re: Fork "axle holder" removable?

How long are those forks from the cap, to the center of the axle?

 

[irk miller]

Re: Fork "axle holder" removable?

You might be able shorten those shocks with a shorter spring.

 

[JohnK]

Re: Fork "axle holder" removable?

Should have got them this friday but due to the heavy snowing they got delayed so I havnt been able to measure the length.

The stock CB750 forks are 750mm.s från the top to the wheel centre and I want to go a bit lower with my cafe, I guess there is some adjustment available in the clamps, but not too much.

Havnt really thought about replacing springs as I thought this would make the fork softer, but since the CB is way heavier than a Hyper I might get the correct lenght without doing anything

 

[JohnK]

Re: Fork "axle holder" removable?

Did some reading and it looks lika a cartridge type USD shock is easy enough to lower, basicly by adding a spacer to the spring and shortening the preload spacer/adjuster.

Also just realized that the 750mm stock forks I measured was under load, with the bike on the side stand, they might be longer unloaded.

 

[JohnK]

Finally got the forks and yes they are way too long, seems like I need to lower them 40-50mm.s


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Removed the cartridge on the lunchbreak today, doesnt seem too impossible to figure out how to lower it
Will disassemble the cartridge soon to see how I am going to solve this.


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[JohnK]

And so the first hurdle, I need to open the piston assembly to be able to fit a spacer, but that wasnt as easy as I thought.
I am afraid that this is a one piece unit, pressed in both ends.

Does anyone have an idea on how to open it?

End facing the bottom of the shock, threaded hole is where the bottom screw goes.

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This is the end facing the spring, an aluminium washer sits on here, then the preload spacer and finally the spring.

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[JohnK]

I solved it, using a pipe cutter I cut the top off then fitted an aluminum spacer and a washer towards the stop spring, then I rewelded the shock assy.
Now I just have to fix the other one, should be easy as pie now that I know how it works.


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Fork is now lowered 50mm.s