Well we have a lead we can follow.. might be a blind alley but we have to follow it through,
So CLUTCH engages and disengages the cam??...Then make sure CLUTCH is engaging and disengaging correctly... we also need to see what controls CLUTCH and this is where i need a schematic im afraid... any chance you can scan that area of the schematic in?

I can do better than that. I have a PDF of the whole schematic. Email to you shortly. Thanks mate!