[NSRCA-discussion] YS FZ63S Trouble

[Mark Atwood]

I wouldn¹t hesitate to tear it down yourself and look through it.  They¹re
fairly simple beasts, but pay attention to the orientation of the parts.

If you want to send it in though, send it to YS Parts and Service ­ Richard
Verano.  The web site will have the address...  www.yspartsandservice.com

Their turn around is usually pretty quick. A few days or less, plus transit
time there and back.

-Mark
PS...could be a stuck valve... I¹ve had that happen.  Just too much carbon
build up.  


On 8/26/08 5:32 PM, "ron at inweldcorp.com" <ron at inweldcorp.com> wrote:

> 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.  Doesn¹t 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>
>> It¹s possible that the high speed needle has vibrated it¹s 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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