[NSRCA-discussion] YS FZ63S Trouble

[ron at inweldcorp.com]

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" <don.ramsey at suddenlink.net> 

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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