Topic: Question: Time for a new Valve Train?

[NewOldSchool]

Hey guys quick question:

I did a mild rebuild on my 1974 CB750 K4 at 30k. Pistons, rings, valve guides, valves and seats cut, new cam chain tensioner, head and block surfaced, etc. I now have almost 50k on it and the rocker arms and shafts have now worn to the point that the top end is making a fairly loud clacking sound. I'm going to pull the motor to investigate further.

There are several valve train sets on eBay from lower mileage bikes. Besides the rocker shafts not being locked down on earlier year bikes are there any other differences or can I buy a good valvetrain from say a '72 and drop the A and B blocks right in?

Thanks!

[NewOldSchool]

Bump, I guess Ill try another section.

[SOHC4 Cafe Racer Fan]

NOS,

The components should be interchangeable.  You may want to have a machinist resurface the mating surfaces of the cylinders and head to eliminate any warped surfaces to ensure a good seal.