Thread: Power valve
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Old 02-26-2019, 10:49 AM
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slocalspode slocalspode is offline
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Join Date: Mar 2007
Location: Southern Kalifornia
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Quote:
Originally Posted by viper77765 View Post
Hi all, in my quest to get the ec250 running right. a mate said is the power valve sticking. Can I ask what this feels like and have any of you guys had this happen.

So far I have tried. 38 pilot,170 main, n1ed needle #3
42 pilot, 178 main and N1ED needle #3, #2 and #1
38 pilot, 175 main and N1ED needle #2.

It tops out at 50mph and seems to cough and spluter. It idle but only just with the adjustment screw nearly spring bound in.

It is running std sprockets 14, 48.
The starts first kick and reeds are new.
Is this the Idle adjustment screw? Or the pilot air screw?

If the Idle Adjustment screw is all the way in. You have raised
the slide so high the pilot circuit won't be getting enough venturi
effect to pull fuel from the bowl.
That should not effect the High RPM running of the motor though.

I have had the power valve stick open when I kick the start the
bike a couple times. It makes a awful sound from the exhaust when
the bike idles down from the initial high rev from starting. Most
of the time the valve closes and goes back to normal.

Did you say the bike coughs and sputters at high RPM in every gear
of just in top gear trying to pass 50MPH?

To get the powervalve cover off, you will likely have to remove the
expansion chamber first to remove the cover, then reinstall the pipe
to test run.
Hope you get this figured out. My EC250 is a sweet bike to ride.
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