Try bleeding it and if it improves even for a short while there is something worn out at either the master or "actuator" cylinder. I don't know if you can adjust it out but take a look. Be sure to leave freeplay at the top of any clutch linkage that can be adjusted,
T
Tom Greenleaf - MetroWest Boston - USA
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http://www.autoacsystems.com/tomgreenleaf/