[NSRCA-discussion] YS FZ63S Trouble

[rcmaster199 at aol.com]

Ron,

Rich Verano works on these for YS but since the engine is relatively 
inexpensive you want to think about tearing it down yourself and 
learning on it. Then you'll have confidence to tackle the larger 
brothers (when you get there). Just a thought.

I have found the Factory work to be okay, but has tended to cost much 
too much. So I figured out how to do my own repairs....however I have 
since gone away from larger 4 strokes. But, I do own and use the YS 63.

MattK

-----Original Message-----
From: ron at inweldcorp.com
To: 'General pattern discussion' <nsrca-discussion at lists.nsrca.org>
Sent: Tue, 26 Aug 2008 5:32 pm
Subject: Re: [NSRCA-discussion] YS FZ63S Trouble

I took the carb apart and everything
looked normal and clean.  I replaced all fuel tubing.  I got about
one minute into a test run and – sudden stoppage – at about 1/3
throttle.  The crank turns freely about a quarter turn but hits hard 
stops
in both directions.  Doesn’t look good.

 

I am very mechanical and have been into a
lot of engines but never a four stroke.  Should I tear this down myself 
or
send it to someone?  If so who?  Any idea on lead time?

 



Ron

 



-----Original Message-----

From:
nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of 
vicenterc at comcast.net

Sent: Tuesday, August

 26, 2008 10:48 AM

To: General pattern discussion

Subject: Re: [NSRCA-discussion]
YS FZ63S Trouble

 



I agree with Don.  Looks like there is an air leak.  I will
do the easy stuff first like replace all the fuel lines.  Small hole or
cut in the fuel line could be a problem. 





 





--

Vicente "Vince" Bortone





 





-------------- Original message --------------

From: "Don Ramsey" &lt;don.ramsey at suddenlink.net&gt;

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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