YS 91 ac

[Anthony Romano]

Started putting two check valves in my planes just in case. The weight 
penalty is worth it.







>From: "jim ivey" <jivey61 at msn.com>
>Reply-To: discussion at nsrca.org
>To: discussion at nsrca.org
>Subject: Re: YS 91 ac
>Date: Wed, 09 Apr 2003 16:50:28 -0400
>
>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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