Bike idling fast with new plug?

Elmstreetmotorized

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3:46 PM
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Apr 25, 2009
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I have a 66cc china girl. She has been running great but everyone says to use the ngk plugs so i switched the cheap china plug for the ngk. Now she seems to idle fast. Seems that the motor is reving more then before. I tried the screw but even with it all the way out it stays the same. The needle is set to the stock position. Before the plug change I played with the needle settings and found the stock to work best.
Any ideas why she is running so fast in idle with the new plug?
 
sounds like you might have a vacume leak. Check the plug to make sure it is tight and sealed.

If that is not it then take a can of WD-40 and while the engine is running squirt a little around the intake and back side of the carburetor and then around the crank seals. If the engine slows down then that is where the air leak is.
 
everything should be sealed. Illl have to wait till tomorrow to check. It was sealed and running rather nice before the change. Im 90% sure the plug is seated correctly. Could it be anything else? I didnt know if that ws the way the plug ran?
 
The plug might give you a little hotter spark= better ignition= better fuel economy= more torque.

It will not make an engine rev high and not allow you to adjust it. You might have knocked somthing loose or it was all just a happy coincidence.

The adjustment with no results is a bit of a give away for a vacume leak. I am 99% positive on this.

The only thing else that I could possible think about is you have the throttle cable out of place and it is holding the throttle open.
 
Probably not the problem but just check that the washer in your carb is seated properly underneath the spring. I found on mine after I had adjusted the needle clip one time that somehow the washer flipped upright inside the spring partially jamming the throttle open.
 
The plug might give you a little hotter spark= better ignition= better fuel economy= more torque.

It will not make an engine rev high and not allow you to adjust it. You might have knocked somthing loose or it was all just a happy coincidence.

The adjustment with no results is a bit of a give away for a vacume leak. I am 99% positive on this.

The only thing else that I could possible think about is you have the throttle cable out of place and it is holding the throttle open.

I agree with this. Before you go through too much trouble, mess with the throttle cable a bit. loosen it up a notch and if it idles lower, then that's your problem.

Also, try engaging the bike and giving it no throttle. if it is held open, it will lull you forward at 5-10 miles an hour, even up hills etc.
 
I'll give all of that a check this afternoon. I know when I started it yesterday I let the clutch out without giving it any gas and the bike moved forward instead of killing it. Maybe it's the cable.
 
Well I checked everything i could. Didnt see any issues with the throttle so I thought I would start her up to check for leaks. Only thing is now she wont start at all. With the choke on or off. I pulle the carb off to check for obstructions and found nothing. The few times it tried to start it ran for maybe 5 seconds. When it started it would rev up quickly on its own like i was giving it gas then it would die. Everything is connected and the plug looks good. It is new after all. I'm stumped.
 
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