[NSRCA-discussion] YS FZ63S Trouble

[Don Ramsey]

It's possible that the high speed needle has vibrated it's seat open.  The
120s would do this because of weight of the needle valve.  Once the brass
seat is opened, you have to replace the assembly.
 
 
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of
ron at inweldcorp.com
Sent: Tuesday, August 26, 2008 10:38 AM
To: NSRCA
Subject: [NSRCA-discussion] YS FZ63S Trouble
 
I have a YS FZ63S on my Oxalys 50.  The engine probably has about one
hundred 12 minute flights on it.
 
The first trouble I noticed was that I had to trim the idle up to keep it
running but the engine ran strong at full throttle.
 
After another 10 or 12 flights the engine would not develop full power.
Also, the high speed needle valve is more sensitive where before it was
difficult to tell exactly where the highest rpm was.  Also the idle has to
be trimmed way up as the engine warms up and it quits when trying to
transition to high speed.
 
I have installed a new glow plug, adjusted the valves, adjusted the high and
low speed mixture with no improvement.  I see no air restriction to the
carburetor.  The fuel filter looks clean.  What should I try next?
 
Ron Needham
 
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