Z1OwnersClub GB

Hello gents the fork seals have blown twice after a few miles on my gpz1100 a1 the seals are quality ones not ebay I'm putting 210cc of fork oil in each leg and 7lbs of air any ideas where I'm going wrong .many thanks in advance John

Havnt got the 1100 supplement just the base manual but youre forks are essentially the same as my J ones.
The original seals were superseded because of leaking and the original types or copies of, will not be any good!

Dont know about 210cc but the air pressure is closely related to the available air space and dependent upon it. So it is probably more relevant to know what the 'free' space is above the oil level.
As per manual; forks vertical, springs out and forks fully extended.
That is the base setting for the air space.
The air pressure must be set with the forks 'un-loaded' and 7 psi is at the top of the range if i remember correctly.
7psi with the forks 'loaded' will probably be too high under compression, this is particularly true if the 'free space' is too small!

What type, weight and make of oil are you using?
Without being patronising, i take it the seals were put in 'cup open side down'?
Are the fork springs very soft and compliant.
Some of the J forks have two sets of springs; one short and one long. Are there any parts missing from youre set-up?
Any scoring or rust damage in the area that operates through the seals?


AL

210 ml at oil change 244ml completely dry air pressure 7-14 psi have you replaced the fork bushes ? are the anti dive valves stuck in the closed position

Thanks for the info al the fork oil is 15w medium weight the seals are the right way up the anti dive has been refurbished with a gpz zone kit when I did the air pressure the wheel was resting on the floor and the tubes are in good condition.please could you tell me where you get the new type seals from.
Many thanks John

use genuine seals. you can remove the spring from the seal + cut a couple of mm of the spring to ad more tension to the lip of the seal . to undo the spring just twist it in opposite directions + it will unscrew

https://www.z-power.co.uk/merchantmanag ... cts_id=794

I used these from Ariete for 2 of my ELRs, they are the correct profile (TCY) and Ariete is a quality Italian producer of motorcycle seals and rubber parts that I've used many times, not cheap Chinese stuff. Absolutely no problems.

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=190859923998&ssPageName=ADME:L:OC:US:3160

hello mate will the seals in the link fit the gpz1100 a1 model been on the z power link and they're for the gpz b model. many thanks john

PART NUMBER 92049-1435 £9.58 AVAILABLE AT CRADLEY KAWASAKI

there seems to be a few part numbers that relate to the GPZ A1 forks:

92049-1372 OR 92049-1151
DCY 37 X 49 X 8/10
(Ariete number is ARI.050)


and as Z1bman says:
92049-1435
TCL 37 X 49/49,4 X 8/9,5
(Ariete number is ARI.027)



hope this helps.

92049-1372 OR 92049-1151 superseed to part no 92049-1435

thanks again gents for all your advice a great help as always.
john

hello gents iv'e decided to replace the top and bottom fork bushes also any tips on fitting these.
many thanks in advance john

the bush on the bottom of the fork tube is an easy job just put a screw driver blade in the opening of the bush then twist the screw driver + slide it from the fork tube . there is a special tool for the top bush but it is possible to do without it use the big cup washer which is underneath the fork seal to tap it into the lower leg