I am looking at buying a 95 Gsxr 750. It doesn´t have compression in three cylinders. What could it be that is causing this problem? If you could please also tell me an estimate of the parts cost? I don´t need labor cost included. This bike is going for cheap because the guy was going to fix it and he took the engine out and then he got in a car accident, so it´s still disassembeled. I´m hoping it´s not too expensive of a fix.