YS 140L idle problem

[Bill]

I would check piston and ring for wear.  Usally fuel spitting is due to a older ring.
> 
> From: "Ihncheol Park" <PatternFlyer at sbcglobal.net>
> Date: 2005/01/08 Sat AM 02:26:51 CST
> To: "NSRCA" <discussion at nsrca.org>
> Subject: YS 140L idle problem
> 
> Hi, All,
> 
> I got a friend in Gainsville, Florida who is having trouble running a YS
> 140L.  The engine has about 2 gallons through it.
> 
> It is mounted in a 2m pattern plane.  OS-F, Coolpower 20%.
> The engine runs well above idle. (If the plane is inverted; the upright
> position for the enigne, the engine idles well for a long period).
> 1.5 turns for the highspeed needle and the idle also similar.  Regulator is
> slightly open (maybe around 1/2 turn)
> 
> He says the engine spits a lot of fuel in upright or inverted position
> during running and/or stopped.  Check valve is fine, diaphram is fine,
> adjusting the idle airbleed screw didn't change much.
> He already checked for any debris around plunger and regulator housing.
> Still the same.
> He's got two of 140L, but only one is doing this.
> 
> I am not sure how he sets the idle, but was told that the high is around
> 8700 rpm.  No idea about prop, but I believe APC 15.5x12 which I gave him.
> I am not sure if his engines have the piston modification.
> 
> Any idea?
> 
> Thanks,
> 
> Ihncheol Park
> 
> 
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