What is the proper setting for both intake & exhaust valves?

by Izzy
(North Carolina)

I own a 150cc scooter. I need to adjust the valves, I have no clearance in the intake or exhaust valves. My question is:

What is the proper setting for both intake & exhaust? Any reply will be helpful.

Thank you.

Comments for What is the proper setting for both intake & exhaust valves?

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May 25, 2010
Valve settings
by: Izzy

Thanks Jim. I think I'll try .004 on the Intake and .005 on the exhaust. I'll let you know what happens from there. Thank you for your advice.

May 25, 2010
by: Jim Zeiser

In the next couple of weeks I'll have to perform that odious task my self for the third time in 2700 miles. The inspection takes no time getting the plastic off and on takes forever. The whole job will take me about two and a half to three hours.

May 25, 2010
Honest Answer
by: Jim Zeiser

Don't ask me the metric equivalent, I don't have the number. Intake is .002-.004 inch and exhaust is .003-.005 inch Generally we say set them both at .004 inch and you'll be safe. I'm not surprised after 30,000 miles that you have no clearance on the exhaust. Usually they have no clearance after only 1,000 miles. Chinese valves are two piece, spun welded and stretch at first. My exhaust valve had less than zero clearance at 1250 miles. I had to turn it two times to get it off the valve.

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