ScootDawg Scooter Forum - valve setting

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May 19, 2013, 3:43pm

ScootDawg Scooter Forum :: The Garage :: 250cc Scooters and up.... :: valve setting

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Topic: valve setting (Read 174 times)

ronlee
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valve setting
« Thread Started on Jul 24, 2012, 5:59pm »

I am wondering if there is any downside to having the valves a bit loose other then the clicking sound. At least they wouldn't tighten up and not seat completely possibly causing them to burn and cause other problems associated with tight valve clearances.

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richardthescooter1
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Re: valve setting
« Reply #1 on Jul 24, 2012, 6:27pm »

I would think it would effect performance, depending on how big of a gap your setting the valves, if you set the valves right each time, your goal is to have they completely seated, my last time I went to adjust my valves, they were seated, did have to adjust them.

Last February had my nut come loose on my valves (had very little power).

« Last Edit: Jul 24, 2012, 6:29pm by richardthescooter1 »

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OverReved
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Re: valve setting
« Reply #2 on Jul 24, 2012, 7:24pm »

Running valves looser will make a bit of noise. It also acts like you changed the profile of your cam shaft to a small degree. The effects you will have are mainly reduced valve overlap which at high RPM can make the motor more efficient since there is less chance of unburned fuel making its way from the intake to the exhaust port, but also reduce maximum power a small amount if your cylinder isn't savaging all the exhaust out before the intake stroke begins.

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wile
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Re: valve setting
« Reply #3 on Jul 24, 2012, 7:46pm »

Like they say a happy valve is a little loose valve, TICKY TICKY is good CHATTER CHATTER is to loose, No sound they may be to tight. I prefer Ticky Ticky.

If anyone knows hotrods its like having solid lifters. Sounds a diesel motor but not as loud.
Wile

« Last Edit: Jul 24, 2012, 7:49pm by wile »

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nulldevice
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Re: valve setting
« Reply #4 on Jul 24, 2012, 9:38pm »

If the tappets whisper to you when you finish adjusting them that is good. If they are noticeable as you ride they are too loose. Sounding like a diesel motor will do nasty things to the cam, rockers, valve stem tips and if really bad the valve seat because the acceleration ramps of the cam profile are not being used.

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