one for the mechanically minded
i have fitted a zx9r b engine into my zxr750L after blowing up the 750 engine. it was smoking badly and blowing oil out its breather. with the breather pipe removed it was spraying oil to about the top of the airbox in height and smoking from the exhaust excessively. i stripped the top end and found what i thought was the problem, on all 4 pistons the ring gaps were in line allowing blow by. i set the rings properly and rebuilt the engine. the smoke has gone!!
i never touched the head in any way, oil is correct weight and level, no wear marks on bores or pistons, rings looked ok, everything was cleaned and oiled before reassembly
but the oil is still coming out the breather, its no longer coming out with force more frothing up and running out. it has changed in revs when this happens, before it was about 5000rpm now its if the engine is held at a steady 9000rpm. the oil is a dirty brown colour when it comes out as the froth settles it becomes black by the time it lands on the floor.
has anyone heard of this before? does anyone have any ideas on whats causing it and how to cure it??
please help before i have to go and buy another engine that i cant afford
pic for attention