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What size is the damper top nut on my 2001 Jackal

M

moparrob

Just got it firing!
Joined
Apr 11, 2020
Messages
18
Location
Los Angeles
I am going to re-valve my forks on my 2001 Jackal and was wondering if anyone knows what the size of this hex is or if there is a proper tool to hold the rod while loosening the bottom bolt? Thanks in advance for the help.

Damper Rod hex
 
I have re-valved forks before, so I am not worried about performing the procedure. The question I have relates to how to hold the damping rod in place to tighten the lower bolt, after I remove the existing hex from the top of the rod as instructed by Race Tech

Damper without hex

I know some people mention using a length of 1 inch square tube to roughly approximate the size of the remaining hex after removing the 8mm hex insert, I was just hoping to use a more precise tool.
 
Are the edges / facets I colored something that a Large Nut could fit in to hold it
and still get a Hex key through the middle ?

( I'm imagining that's where the square tube came in play last time ? )

Damper without hex 2
 
Deadeye, yes, they do make a tool that is supposed to fit the flats, I just wanted to be sure of the actual size. They look like this:

Motion pro fork compression valve removal tool

They also have one like this for the fork caps

Motion pro showa 22mm SFF air fork tool


In any case I think I am just going to be using the 1 inch tube for now and not over-think the process. Thanks for all of the input.
 
I went looking for the OEM tool list to no avail. Even then, you can bet it would be painfully expensive I'm sure. If you can put a caliper on it, please, post again with the size.
Below is a generic version (not listed for the Guzzi forks), which either you can do or I can make one (which I'd like to do for my shop anyway).

ABA3BBFB 3E51 481D A906 70D32012EA92
 
I will tackle it next week, now that I have the emulator valves and setup info from Matt Wiley at Race Tech. Will let you know.
 
Answer: none of the above! The top looks like this

Damper rod 2

I ended up taking a taper walled 3/8 drive socket that fit in the end of the damper rod and wrapped it with electrical tape to create friction on the inside of the hole. It works but it was crude. I have learned that other people have used tapered wood shafts (like a broom handle sanded to a taper) to achieve this also. Necessity is the mother of invention.
 
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