Posts by m in sc
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yup. cam profiles and how quickly the (or aggressively) the cam closes or opens the valve can affect noise. keep in mind, its better to have them a bit too loose vs too tight. reason being is that if too tight calve can hang open and you can burn a valve up.
on the OLD cb750 sohc motors, they are rocker arm as well. when we used to put hot cams in them and the rpms would go up from stock, we used to go a bit large on the clearances to allow the valves to close completely since you got soem float at a very high rpm with stock clearances. pretty common practice with these old dinosaur rocker arm setups like the grom has. :toothy5:
on the OLD cb750 sohc motors, they are rocker arm as well. when we used to put hot cams in them and the rpms would go up from stock, we used to go a bit large on the clearances to allow the valves to close completely since you got soem float at a very high rpm with stock clearances. pretty common practice with these old dinosaur rocker arm setups like the grom has. :toothy5:
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