usd forks

[lawsom34]

hi just wonderinf what is best/cheapest way to fit a complete gsxr usd front end to my kz1000j
also any advice on rear end cheers all

[london calling]

Usually you'd use the stem from the Z1000J bottom yoke and have it pressed into the GSXR bottom yoke.
Then you just need bearings to suit.
Speak to the club's LAUNDRY specialist "Piggy Piglet" Pigford.

[big green bus]

i can get you a new stem made if you need one but you will have two get it pressed in unless you post me the bottom yoke and i can do it all

[lawsom34]

is there any problems with usd forks being shorter ? that was one area of concern i have

[london calling]

Which Gixer USD forks have you got ??
Obviously shorter forks will affect ground clearance,etc but I've seen 1000J with ZX636 USD fork legs in Streetfighters mag.
Though things usually look different in the flesh

[lawsom34]

they are off a 750 nnot sure of model with 6 pots

[london calling]

I suppose you've got to compare the length of the standard Kawasaki forks with the GSXR ones and decide if they're going to be long enough and provide enough ground clearance.
Also the GSXR forks will be sprung for a much lighter bike,so maybe you should look at different springs,etc.
Also fork seal replacement on USD forks can be quite involved,depending on the make.

[Rich]

They will also speed up the steering, may make it twitchy through corners, dive in under braking and drop into the turn. For the 43mm RWU GSXR, 1100s were 25mm longer than 750cc ones, don't know about USD.

[big green bus]

yamaha tend to be longer as they mount the clipons on top of the yokes yzf 750 are ok. most of the kawasaki ones tend to be too short. the wheel could hit the exhaust under heavy braking or flatten the bottom of a 4/1 pipe like a harris. i would get a tape measure and look at as many bikes as possible.

[KWACKERZ1]

750 Forks with the six pots are most likely to be zx7r forks, they are from memory 2" shorter than standard z1000 forks.
However when I measured my gpz11 probably the same as the 1000j they were even longer than a standard 1000.
My records show
z1000 being 31.5"
zrx1100 being 30.5"
gpz11 being 34"

so that would make zx7r ones 29.5 from the top edge to the middle of the spindle. (zx9rb forks are supposed to be a couple of inch longer and the b2's onwards had 6 pots the same as the zx7r)
So zx7r ones would be well short especially with a 17" wheel. However all is not lost.
IZAX Engineering can make offset yokes upto 1.5" approx £450 however the better option would be to get the forks to Maxton engineering who can extend the forks and set them up to the right weight for the rider and new bike, so they work properly. The bad news its approx £500 again.
Hope this helps.

[Pigford]

Also you'll be running a 17" wheel, not a 19", which, even with the tyre profile, will lose another 1" or so...

Old Gixxer - early 90's - are 1" longer than the rest of the Gixxer USD

Stepped yokes.........





£££££'s....

[lawsom34]

cheers for all advice got loads of stuff to ponder over now

[tlc]

Look at this

http://z1ownersclub.co.uk/forum/viewtop ... c&start=60

[brian 450]

gsxr forks are 2" to short plus smaller wheel. you will have to extend them or make a steped yolk!!! standard z stem won't fit in gsxr bottom yolk if you are using the gsxr k series front ends as bottom yolk is fatter and it's not long enough so you will have to make a new one!! i am getting one made next week for my bike the one on link above. if you are only after upside down forks and are not bothered about having a modern set get a set off a FZR 100RU as they will be long enough and cheeper than gsxr ones