fork oil seal

fork oil seal 03 Nov 2022 01:15 #876323

alzo Topic Author Offline User Posts: 10 Thank you received: 0	Hi, Has anyone ever changed this seal? if you did how to change it so that it doesn't breake? Can't find a catalogue number only for the hole cylinder set. Gentlemen, you had my curiosity… but now you have my attention! Attachments:
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fork oil seal 03 Nov 2022 12:29 #876340

martin_csr Offline User Posts: 7983 Thank you received: 1621	What KZ650 is it? year & model. 1981 KZ650 Competition Sports and Road
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fork oil seal 04 Nov 2022 00:45 #876358

alzo Topic Author Offline User Posts: 10 Thank you received: 0	Sorry .. forgot to attach pic. It should be 1977 or 78. Gentlemen, you had my curiosity… but now you have my attention!
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fork oil seal 04 Nov 2022 04:29 #876363

hardrockminer Offline Sustaining Member Posts: 2927 Thank you received: 1022	I think it's the same seal used on larger Kawasakis. Get a seal puller to remove the old seal. If it resists then apply a bit of heat with a propane torch. There is a driver to install the new one. I usually grease the new one up a bit to make it slip into location. I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.
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fork oil seal 04 Nov 2022 07:25 #876369

martin_csr Offline User Posts: 7983 Thank you received: 1621	The spacer circled in the pic isn't a seal. I think it acts as a bushing. Mine are a white plastic. AFAIK, replacements aren't available separately, but are part of the fork cylinder assembly. 1981 KZ650 Competition Sports and Road
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fork oil seal 04 Nov 2022 15:15 #876395

Mikaw
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It’s a fork damper piston ring. Z-Power sells them. Couldn’t find a listing for the 650.

Your original ones are phenolic material. Very brittle. If you must remove them EXTREME caution and patience needed. DO NOT over expand them to get them off. THEY WILL BREAK!!!
www.z-power.co.uk/z900a4-kz900b1-ltd-197...n-ring-5007509001000

1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

The following user(s) said Thank You: blipco, martin_csr

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Last edit: by Mikaw.

fork oil seal 07 Nov 2022 01:52 #876497

alzo Topic Author Offline User Posts: 10 Thank you received: 0	Is there a way to determine the wear factor? I wouldn't bother changing it if it is still in the wear factor range. I assume that it should have larger OD than the metal OD. How much are we talking about? Gentlemen, you had my curiosity… but now you have my attention!
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fork oil seal 07 Nov 2022 05:53 #876501

Mikaw Offline Sustaining Member Posts: 4898 Thank you received: 1858	Here it is mentioned part number 4, but no mention of testing it. I’d suggest contacting a company like Sonic that deals with forks. They might have an answer. 1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4 1976 KZ 900 B1 LTD 1978 KZ 1000 B2 LTD 1980 KZ 750 E1 Kowledge Speaks, But Wisdom Listens. Jimi Hendrix. Attachments:
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fork oil seal 07 Nov 2022 08:06 #876503

Wookie58
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wrote:
Is there a way to determine the wear factor? I wouldn't bother changing it if it is still in the wear factor range.
I assume that it should have larger OD than the metal OD. How much are we talking about?

If you are going to the trouble of disassembling the forks to a point where you could measure the seal, does it not make sense to just replace them and be done with it?

1982 KZ1000 Ltd
www.kzrider.com/forum/11-projects/617631...-82-begins?start=192
kzrider.com/forum/forum-index/faq-wiki/6...-fault-finding-guide