Topic: Ninja GPZ 600 front forks.

[Kalamazoo]

Will 86 ninja GPZ 600 forks fit on my 1977 CB 550?

and... how much would you pay for a GPZ 600 front fork with good front rim, tire, and rotor?

[unkle fester]

well......anything will work if ya modify it enough.....it is a direct swap.....no....the Ninja trees won't work with the Honda neck because the bearings are different.....the Kawi uses a 25x47x15 upper and a 28x52x16.5 lower bearing and the honda uses a 26x48.5x15.2 upper and a 30x50x14.4 lower bearing.......plus the fork tubes on the Honda are 35mm and the Kawi is 37mm.....BUT...it is possible to remove the Honda stem and use it in the Kawasaki trees......gotta cut the welds, press the stem out, put it in the other trees......but, the stems may be different lengths.......hope this helps...

[Kalamazoo]

Yeah I was sure it wouldnt be a direct swap, kind of asked the wrong question there. It was more of what would it take to do the swap.
and thanks for the info. Now anyone,
How much would you pay?

[Alan F.]

Look at it this way, complete rolling, braking, front end with a speedometer drive and cable, and a good tire?   A decent used tire could go for what $20-30, a good straight wheel maybe $50, forks without pitting and seals that don't leak maybe $65 a good complete brake system, maybe $50

I'd bid $100 and go from there, but $200 for a front end that doesn't need anything wouldn't be out of line.  it all depends on the asking price, the quality of the item, and how much you're willing to pay for it.  After looking the item over I usually ask the seller to honestly talk about how much he needs for the item.  That'll usually get you some insight on how low to go without being insulting. 

And if it's a local item on ebay, you can pick the item up to save shipping costs....which can afford you a higher bid.... don't forget craigslist, freecycle, and other local listings, often a complete bike that's been neglected can be had for cheap, part out the rest of the bike and get your front end for free, effectively.

[754]

Generally, you will need a stem built, I have done a few.. ballpark around 75.00.. find someone close that understands what you need..

Take into accont that the fork-stem offset may be less causing tank interference.. and probably steering stop problems.

I have a similar fork with braided lines (not sure of the Year), because of antidive it has extra brake lines, at least 5 pcs.. hate to buy them new!

[MRieck]

Generally, you will need a stem built, I have done a few.. ballpark around 75.00.. find someone close that understands what you need..

Take into accont that the fork-stem offset may be less causing tank interference.. and probably steering stop problems.

I have a similar fork with braided lines (not sure of the Year), because of antidive it has extra brake lines, at least 5 pcs.. hate to buy them new!

Just make some block off plates to replace the anti dive units and ditch the 2 extra lines Frank. I think you're capable of it.

[754]

Actually the fork is complete, minus one caliper. It has braided lines, fork brace , Tomasselli clipons, and a wider mag wheel. Wheel is actually spun aluminum halves fastend with rivets. I have front and rear mags like that, they have pie shaped cutouts. need my buddy to post a pic, been trying to ID them wheels.. rear is abiut 3.5 or 4in wide.

[Geeto67]

DOHC honda forks are 37mm (1981-82 900F), I wonder how hard it would be to use the trees from that on a SOHC neck.

DOHC bearings are 26 x 47 x 15 and 30 x 55 x 17 where as SOHC bearings are: 26 x 48.5 x 15.2 and 30 x 50 x14.4

you would probably need a spacer with the DOHC trees but once you have them on you an probably create spacers for the ninja setup and slide it into the trees. It is easier to make spacers than it is to transplant stems.

this is all conjecture BTW, you would still need to measure things out.