Login  Register

Re: MY 1979 CB750 DOHC BUILD

Posted by RodneyCB750K1979 on Jan 25, 2013; 7:23pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/MY-1979-CB750-DOHC-BUILD-tp4035619p4035702.html

Part 4. I bought a used piston on Ebay and cleaned the others up. I took the cylinder head and jugs to my local Honda dealer and they replaced the valve seals, replaced both exhaust valves on No 1 cylinder, cleaned up the valve seats and lapped the valves, and did a light hone on the cylinders. I had a broken exhaust stud which I eventually took to a welding shop and they were able to extract it. I installed NPR piston rings. The end gaps didn't require adjustment. All were within the acceptable ranges. I didn't have instructions with the rings but after some research, I concluded the top compression ring has the shiny "chrome" lightly chamfered edges and the second compression ring was just steel with no chamfered edges.  Hope this is correct. The stamped letter on the two compression rings were installed facing up.

Cleaned pistons
Cleaned pistons
Cylinder head after repair
New piston rings installed