Re: 1979 CB750K with prolems

Posted by Lucky 1 on Jan 27, 2012; 9:45pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/1979-CB750K-with-problems-tp3691671p3694654.html

Remove all of the tappet covers and make sure all of the rocker arms have adjusting nuts still in place.
A rattling sound can come from many different things.
Loose cam chain.
Broken piston rings in the combustion chamber.
Sometimes young guys just think the engine should have no noise at all like a modern engine. WRONG.
One time a guy told me he had just completely rebuilt his chevy six cylinder 1956 engine but it had noises.
He was really worried.
I went over to his house and it sounded like a very smooth 1956 chevy six cylinder engine.
I grew up during that time so I had a reference to the sound.

You would be surprised how many owners have adjusted the valves on their Honda but never took the slop out of the cam chain. Ever.
OR they attempted to take the slack out of the cam chain and did not follow directions in the shop manual, and made it worse than it would have been if they had just left it alone.
The cam chain MUST have the slack taken out of it BEFORE the valve adjustment.
That is WHY the cam chain adjustment comes before the valve adjustment in the shop manual, because it is supposed to be done first.