I am trying to figure where all the oil is going in our cx. We took it for a 200km ride in the moutains and it burnt half the range on the dip stick e.g. from half full to empty on the cross hatching on the dip stick. The clutch would slip quite badly above 7000rpm if you gave your wrist a bit of a flick. Think i have the clutch slippage sorted, sticky cable, but was wondering if the plates would get hot enough while slipping to burn oil. Also do cx's ever suck oil out of the crankcase breather at high rpms, the foam peice in the air box was disintergrated when we got her going again and we replaced it with a circle piece of filter foam. I suppose after I ruled both of them out I could pretty saftely assume its rings or valve guides??? The only time its smokes is when im follwing and my dad gives it some revs, normally up a hill, not a big plume of smoke more of a constant haize untill he upshifted or backed off.