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Discussion Starter · #1 ·
I've got a 1990 ZX11. After a couple weeks the clutch lever gets spongy. I've rebuilt the clutch master cylinder, replaced the clutch line with a steel braided line and no difference. I just ordered a new piston seal for the slave cylinder but I have a suspicion it's the master cylinder itself. A couple years ago I went through the same thing with the front brakes, I measured the inside of the master cylinder bore only to find the bore I/D was wider in the first 1/2 inch. I think the same thing is happening in the clutch master cylinder. Anyone else go through the same thing?
 

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Discussion Starter · #3 ·
Yep it's been bleed, absolutely no air in the system. When it does go spungy it takes very little bleeding to get it strong again and no air comes out.
 

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Prolly isnt it, but the Clutch release mechanism also has a SEAL in it



P/N 92049, Seal, oil Piston.
 

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Discussion Starter · #5 ·
I was thinking the same thing so I ordered that seal from a bike shop. When I replace that seal and if it doesn't fix it I'll just have to look for a newer clutch master cylinder....it looks like a zzr1200 is the same as the ZX11.
 
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