New rebuild after 10 years "deep sleep" mode

Had to made my own adjustable dog bones with a CW/CCW thread , (need them 20 - 30 mm longer), plus have shorten the rear upper engine mount spacer.

DOHC wrote:
Have you considered using a rotary shaft seal instead of an o-ring? It seems like a shaft seal might be both lower friction and less likely to wear out.

Yes i do but two o-rings on both sides with a lot of grease and a mini fender on the underside of the swing arm do the same job.
The needle bearing has a very special OD of 27 mm, BKM2024JAU (KOYO), and i had to do some extra bore diameter of 28 mm
but i think about it to do it later, thanks for the tip.

DOHC wrote:
I also wanted to say that this is the cleanest mono-shock conversion I've ever seen. Your clever and elegant use of the existing frame brackets is fantastic.

Thank you very much for your kind of words, it makes me a little proud.
I love the bolt on way and if i went back to twin shock the mono shock frame can stay there to strengthen the frame area.
The technical testing center inspector in Germany hate frame weldings and deny the inspection sticker without an welding report,(money pit).

How is going with your upgrade?
Ready for a new season soon?

gordone i am waiting for my rear brake caliper adapter parts that fit to the swing arm.
Some parts Need some more time to complete, sadly but true.

Very nice work! I notice you have a "J" model valve cover on the engine. What is the reason for that?

A 1000J head need a "J" model valve cover. (plus cam chain idler adapter mod for the earlier KZ900/1000)
The head (ported) has new valve guides/seals but i need a 1100 ccm lower end for better Performance.

Looking good Michael.

Is the entire engine a "J" model or is it just the head?

Only the "J" model cylinder head

Scirocco wrote: gordone i am waiting for my rear brake caliper adapter parts that fit to the swing arm.
Some parts Need some more time to complete, sadly but true.

I understand, looking forward to next update

I'm curious what advantage the "J" head provides?

the j-model head has larger "as cast" ports and bigger valves.
the stock port on a j-model head is larger than a kz900/1000 can be ported to.

which is why you see people using j-model heads on older lower ends.
hth,

leon