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I've been meaning to do a writeup on this and I will soon. As Don mentioned, everyone immediately jumps to air in the lines with this scenario. I've been dealing with a similar issue and I finally just figured it out. Have you deleted your upper bleed line? The brass fitting everyone uses has too small of an inside diameter to flow the amount of fluid/pressure the master cylinder pumps through. The inside diameter of the line itself is much larger than that of the fitting, which creates a bottleneck effect in the hydraulic system. If you think about the theory of operation, the pressure will build up on the top end when the clutch pedal is depressed, and eventually will flow all the way through but not usually quickly enough for a normal shift. Upon release of the pedal, the same pressure builds up on the slave side, and after several pumps the slave shaft against the fork is no longer in the same position as it was when cool because there will now be a pressure buildup or vacuum on either side, along with the fluid becoming very hot and adding to the issue. Since the slave/fork release point becomes erratic, everyone jumps to "air in the lines." That is incorrect, especially since the clutch hydraulic line barely holds a few ounces to begin with. The best way to test this on your z is to very slowly depress the clutch pedal, then very slowly release it to see where it engages. After a few short but complete pedal presses this way, the engagement point should return to stock. If it does, you know now to just remove the brass fitting, bore it out and reinstall it. Done.
Cheers,
JBrobst "A life spent making mistakes is not only more honorable, but more
useful than a life spent doing nothing." George Bernard Shaw |
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