ZXR Forks onto GPZ

[RUDDY]

Forgive me if this is a stupid question as I have a lot to learn. I am considering options for my GPz550D1 resto, one option is standard build the sevcond is slightly modified, this months Practical Sportsbike as a lovely modded ZRX400 featured and its making me lean to the modded route.

So, does anyone know if ZXR400 USD forks and stanchions would fit or be safely made to fit the GPz ?

Cheers, Paul

[kas750]

Hi Paul...
The zxr forks are certainly a common mod on all typres of special.Another front end to consider is from an rgv250.
On the right is a kh250 with an rgv250 front and rear end and H1 500 engine.
The bike on the left is a kh250 with h1 engine.The front and rear end are from a cagiva!!!
The point i am making is you can make owt fit owt..Sorry...thats not much help is it?

[garyd]

Isn't the big issue that USD are shorter than RWU.

So you either have to lengthen them or get a custom top yolk made to reach down.

[coldsummer]

Paul, like Kas750 said you can fit anything really but you will need to consider getting a new stem made in order to accommodate the gpz bearings. Also issues around the difference in fork lengths which will affect the steering geometry so you may need to get the donor forks lengthened which will involved fork top extenders and internal spacers. Modern forks tend to have less offset so you may also need to alter the steering stop mechanism to prevent the forks hitting the tank on full lock, yet you still need to to retain a useable turning range. Smaller issues may be encountered with matching up the speedo drive arrangements and accommodating modern brake master cylinder and possibly switchgear.

So, it may be a lot of work unless you are lucky enough to find a front end with similar dimensions as the GPZ's. Hope I haven't dampened your enthusiasm too much.

[coldsummer]

Isn't the big issue that USD are shorter than RWU.

So you either have to lenthen them or get a custom top yolk made to reach down.

That is one of the problems Gary. A stepped yoke can be made, I recently had a custom set of yokes/stem made up for my 'number seven' project and it wasn't cheap.

[andyb1962]

.
On the right is a kh250 with an rgv250 front and rear end and H1 500 engine.
The bike on the left is a kh250 with h1 engine.The front and rear end are from a cagiva!!!

Very tasty ............................ i want one

[compo z1r]

Forgive me if this is a stupid question as I have a lot to learn. I am considering options for my GPz550D1 resto, one option is standard build the sevcond is slightly modified, this months Practical Sportsbike as a lovely modded ZRX400 featured and its making me lean to the modded route.

So, does anyone know if ZXR400 USD forks and stanchions would fit or be safely made to fit the GPz ?

Cheers, Paul

paul not a problem u need the 43mm top and bott yoke's and modd the stem to fit as this pics,





these have been made to fit all zeds from 750-up.

[RUDDY]

Cheers guys, few sets of zxr forks on ebay, may get a set and play with them when the frames bare, guess I would then need decent rear shocks to complement the front.

Cheers Paul

[z650freak]

these have been made to fit all zeds from 750-up. [/quote]

What length are the zxr forks???

[nigel bessant]

Cheers guys, few sets of zxr forks on ebay, may get a set and play with them when the frames bare, guess I would then need decent rear shocks to complement the front.

Cheers Paul

Paul, you could try buying a complete ZXR non runner and selling the parts you don't want, you will probably sell all the unwanted parts for what you bought the bike for and end up with a set of free USD's.
Worth a thought. That's what I did but it takes a few months to get rid.

[floydsz1]

one of the zx9's (cant remember which model it was) came with usd forks while the other models are rwu ones. im sure the usd ones are longer than most usd forks from other bikes. That would keep the ground clearence ok.

[garyd]

Weirdly it was the first models of ZX9R that had the SD...94 -97 B model.

The C went normal to save weight.