Topic: QUESTION FOR cb 350 TWIN ACES

[Killer Canary]

hELLO, I'm in the process of  rebuilding my motor, which was running well but had various oil leaks. It seemed to me that the valves were noisier than the sohc fours even when properly adjusted. Now with the rocker cover off I see that the rockers each move side to side a good 15 thou which is probably producing the noise.
Is this normal or are there shims/washers that a PO might have forgotten to install
Thanks, I need to know before I can button my motor back up.

[tbpmusic]

There is no spec listed for  tappet sideplay in the Honda Manaul, nor am I aware of one.
So it's probably irrelevant.

There are no washers that I'm aware of.
The 350 is a noisy head, even when the tappets are spot on.

bill2

[Honda!]

There is no spec listed for  tappet sideplay in the Honda Manaul, nor am I aware of one.
So it's probably irrelevant.

There are no washers that I'm aware of.
The 350 is a noisy head, even when the tappets are spot on.

bill2

Agreed, my 350 always made tons of valve train noise, even when adjusted properly.

[Killer Canary]

That's about as clear as it gets, thanks folks.
Love this motor, though.

[Green550F]

Noisy is a relative term. I grew up in a IH tractor repair shop!
Still I love the adjustment! easier than a 550 and kicks the crap out of shim-under-bucket that my suzuki had.

[lordmoonpie]

Yep it's normal - the side float on the CB350 cam is quite alarming too. On my racer where the cam cover and points mechanism was all thrown away, you could rev the motor and watch the end of the camshaft move a good 2mm and this was in a 48bhp motor that revved to 12 thou!

[Raul CB750K1]

Yep it's normal - the side float on the CB350 cam is quite alarming too. On my racer where the cam cover and points mechanism was all thrown away, you could rev the motor and watch the end of the camshaft move a good 2mm and this was in a 48bhp motor that revved to 12 thou!

Actually, the parts manual lists different shim washers to reduce the side float of the camshaft to spec..... 

[tbpmusic]

Actually, the parts manual lists different shim washers to reduce the side float of the camshaft to spec..... 

OK, what is the spec?? I see nothing in the Honda manual regarding an appropriate side play value.
It's irrelevant to start shimming if there is no target.


bill2

[Raul CB750K1]

Hope this helps....

[mark]

Re:camshaft side clearance....
"If the side clearance is excessively large, noise will develop between 5000 to 6000 rpm.... If the side clearance is over 1.0mm (.040"), install 0.2mm shim which are available. The standard side clearance is 0.2~0.6mm (.008~.024")."

1970 CB/CL-250/350 manual, pg. 17.

No mention made about rocker arm side clearance.

[lordmoonpie]

Re:camshaft side clearance....
"If the side clearance is excessively large, noise will develop between 5000 to 6000 rpm.... "

1970 CB/CL-250/350 manual, pg. 17.

No mention made about rocker arm side clearance.

Well I guess my CB350 was far from standard but it was also a very quiet engine despite the apparent side play in the (Joy) cam....makes sense for a standard engine even though it's not something I've personally seen.