GPZ750/810 racer running....

flimsy rear two 10mm engine bolts reamed out to 12mm/tight fit, right top ear is now an ally clamp

flimsy retaining tongues in clipons removed, proper plate welded in place

stock front engines mounts transformed to solid

reduced steering lock with adjustable stops

solid mounts in place

getting there, two months till first race

Nice work turboguzzi! I like the use of the GSXR rear shock. Is it from a 750 or 1100? Looks just like the 750 shock that I have used on the testarossa streetfighter. We even mounted the nitrogen reservoir in almost the same place. I'm sure that you already know this but Racetech has all the parts to rebuild that shock if need be. I did mine myself, it wasn't really all that hard.

it's a 750's

good to know about the rebuild parts

got another one that needs some work

pretty cool...

turboguzzi wrote:

it's a 750's

good to know about the rebuild parts

got another one that needs some work

If it hasn't been rebuilt yet then it will need it. Mine had zero nitrogen pressure and the oil was nasty. It had almost no dampening. Not too good for a racebike. 1000% improvement with the rebuild. Anyway here's the link to my writeup of the rebuild, it might just help: kzrider.com/index.php?option=com_kunena&...98379&catid=5#398379

hi testa

nice post

a couple of questions

what spring rate did you go with? did you have problems with the stock gsxr spring?

I expect my bike to weight in at 165kg / 360 lbs. that's quite bit lighter than either stock gpz or gsxr

didnt you rebuild the main shaft seal? i think i need to do that on the spare shock

heard there is shock specific oil as fork oil has strong additives to swell the seals. have you tried to find one?

Wow your bike is going to be really light. My spring rate would not be any good to you. I set my rear suspension with the same pickup points as the GSXR. I had the GSXR next to the KZ as I was measuring. Since the rear suspension is basically a complete 1995 GSXR 750, I went to racetech's calculator here: old.racetech.com/evalving/menu/searchstreet.asp

You punch in your info here and it suggests spring rates, and oil weights for your application. So I picked a 95 GSXR 750 and lied to the calculator. I told it that the bike weighs 500 lbs (guessing, and hoping that it winds up a little lighter.) and that I weigh 235 lbs. (Actual.) This gave me a rear shock spring rate of 7.94 Kg/mm, so I selected the closest at 8 Kg/mm IIRC. You will obviously come up with drastically different numbers unless you're a big sombitch. :laugh:

All of the seals in my shock were in very good condition, so none needed replacement. The only thing that leaked out was the nitrogen, and considering the design, I'm not sure that it could hold that amount of pressure for any great length of time. Actually, if you do rebuild yours, I would be interested to know if it did retain any pressure. Most people that I have spoken with, who have rebuilt their shocks had no pressure. I'm going to do my zx-10r someday, and we'll see about it too.

No, I did not try and find shock specific oil. I used regular fork oil. Racetech recommends the same for shocks or forks. I was un-aware of this possibility.