You will find that the piston on your slave cylinder is being pushed back.
Two things can cause this. Running to thick an engine oil. (should be 10w40)
or the spring behind the piston on the slave cylinder is to week.
Gas Gas updated this spring in late 2004 to a heaver spring.
I bet if you take your master cylinder cap off start the bike and rev it you will see fluid being forced up, because the piston is getting pushed back.
If the engine oil is to thick a grade it builds to much pressure down the main shaft and pushes the piston back.
Note: If you purchase a new slave cylinder kit is is the two stroke part number and has a weeker spring in it so you will need the updated spring to go with the kit.
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