Ok, so I am stumped on this. I have an HKS single plate clutch, chatters like a bastard, etc, but it has been a good clutch and losted a long time. It still works fine, so let me explain the problem:

While driving, if you put the clutch in, and feed throttle in when you feed clutch out ( aka, lesson on how to drive a stick, lol), if you give it enough gas, the clutch pedal does not come back all the way, maybe only 3/4 of the way. Then when you let off the gas, the clutch pedal pops back up the rest of the way. If you arent driving, and you just put the clutch in, it comes back all the way out just fine.

Now, I was quite worried this was crank walk, I know evos rarely get it but any engine can get it, so I thought Id check. Service spec is either .2mm or .7 mm. I measured much less than .1mm, so Im well within the service specs.

The only thing I can think of is the input s haft on the tranny is moving a bit when theres load put on it. Any other Ideas? Ive rebled the clutch system numerous times, and the fact it only happens while driving and giving it a decent amount of throttle tells me its not the hydraulic system.

Ryan- stumped