[NSRCA-discussion] YS 140 FZ: loads up and dies 2500 - 4500 rpm

[Derek Koopowitz]

I would suggest replacing the piston ring and perhaps even the bearings.

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From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of
adriancwong at earthlink.net
Sent: Monday, February 02, 2009 12:09 PM
To: paul.horan at sbcglobal.net; General pattern discussion
Subject: Re: [NSRCA-discussion] YS 140 FZ: loads up and dies 2500 - 4500 rpm


What fuel are you using? Check the exhaust valve for carbon deposit and
header opening for clogging. 

The surging could be uneven contact point on the valve cover. Wet sand it
lightly with 400 sand paper on smooth surface until surface shines.

Adrian




-----Original Message----- 
From: Paul Horan 
Sent: Feb 2, 2009 11:18 AM 
To: General pattern discussion 
Subject: [NSRCA-discussion] YS 140 FZ: loads up and dies 2500 - 4500 rpm 



    The problem is a YS 140 FZ that runs fine at idle and 40 to 100%
throttle but loads up around 2500 - 4500 rpm.  This is especially nasty
since that is the rpm range for a smooth takeoff,  once it goes to full
throttle the engine does not develop full power (about 40% power) and dies.
Plenty of smoke trail so it is not going lean.   
   Another symptom is on the ground running  2500 - 4500 rpm the rpm is not
steady. 
Help,
Paul
NSRCA 3606 

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