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Re: Where Do I Begin?

Posted by RodneyCB750K1979 on Dec 09, 2012; 6:39am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Where-Do-I-Begin-tp4033031p4033322.html

Thanks for everyone's advise.  I did a pressure test and discovered air passing through #1 exhaust valves.  I also picked up some air noise inside the crankcase which I believe indicates some leakage past the piston rings. I removed the cylinder head today and discovered the top of #1 piston and the head chamber looked like they were peened severely.  This affected the valve seat area. I could think of three likely causes: predetonation, overheating, or a loose piece of metal bouncing around.  The cylinder bore appeared smooth with no nicks or scratches. The #1 piston compression ring does not move inside gland and the piston has some distortion. Can I replace one piston only or do they need to be replaced as a set?  Can the head be repaired?



 Piston 1 Top Piston 1 TopPiston 1 DistortionNo 1 Cylinder Valves