YS 91 ac

[jim ivey]

William
Eric hit the nail on the head. I had a problem,with a friends plane just 
like this at The Peach Pattern Classic 2 weeks ago and it was the check 
valve.I caught the problem when the tank didn't phutt(spew) much when 
relieved of pressure.We changed the check valve and then had to reneedle the 
engine.This solved the problem.
I have had these pressure problems enough times, that I have made a pressure 
tester.I used a hobby tire pump, a check valve (to keep the pressure from 
leaking back through the pump) and a pressure gauge from automotive 
supply.Plumb it with fuel tubing and you are in business. remove the fuel 
supply tube from the engine and apply pressure here.This checks the whole 
tank system,including the check valve. I usually pump to 10 psi since the YS 
runs at 6-8 PSI. A tight system will hold pressure 'till next week.

Now all you-uns check my english too,'" etc.Not my best class in school 
either.

Jim Ivey

Jim Ivey



jivey61 at msn.com





>From: "William Clemons" <W.Clemons at m.cc.utah.edu>
>Reply-To: discussion at nsrca.org
>To: <discussion at nsrca.org>
>Subject: YS 91 ac
>Date: Wed, 9 Apr 2003 12:42:00 -0600
>
>This is for the guys with YS 91 ac experience.  Have you ever had just a 
>loss of pressure from the engine?  It will run fine for a minute and then 
>dies.  I checked the fuel system for air leaks but cannot find any.  I even 
>swapped needle valve assemblies thinking I might have a worn out one.  Any 
>help is appreciated the engine has run fine up to this point.
>Thanks in advance
>William


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