[NSRCA-discussion] Solved: YS 160 question

[Bob Lavey]

It was the check valve, I'm nearly 100$ certain.  I pulled all the fuel
lines from around the engine: case-to-pump, fuel dot-to-pump, pump-to-carb,
carb-to-injector.  They all looked fine and passed the blow and suck test,
but I replaced them anyhow.  I pulled the check valve and ran a new piece of
line from the carb to the injector.  I also checked the plug while I was
under the hood, and it looked fine.  So, since it's 45 degrees, overcast,
and there's a 12mph north wind, I went out to the field to see if it was
better.  It was going to bug me until I could check it out :)  I reset the
needle and regulator to their previous settings and gave it a go.  It
started right up, idled fine, transitioned fine, ran good in the mid-range
and top end, and seemed to have more power.  So it put it in the air.  I
pulled into the square loop, and at 1/2-2/3 throttle it pulled up and up
like it always has.  Yay!

I found a post from Troy Newman on RCU saying you could run without the
check valve, or I'd have never tried that on my own.  It's good to know, in
case this happens again and I don't have a spare handy.

Thanks to everybody for their suggestions and assistance.

Bob


> -----Original Message-----
> From: nsrca-discussion-bounces at lists.nsrca.org 
> [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf 
> Of Bob Lavey
> Sent: Monday, March 01, 2010 12:07 PM
> To: 'General pattern discussion'
> Subject: Re: [NSRCA-discussion] YS 160 question
> 
> That’s a great idea, Glen.  Thanks. 
> 
> > -----Original Message-----
> > From: nsrca-discussion-bounces at lists.nsrca.org
> > [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Glen 
> > Watson
> > Sent: Monday, March 01, 2010 11:31 AM
> > To: 'General pattern discussion'
> > Subject: Re: [NSRCA-discussion] YS 160 question
> > 
> > Hello Bob,
> > 
> > Agree the check valve being able to rotate is suspect.  
> > However why not call Richard Verano at YS Parts and Service
> > (775) 267-9252 before replacing parts to validate your running 
> > symptoms are relative to this part being able to rotate.
> > 
> > ~Glen
> > 
> > 
> > 
> > -----Original Message-----
> > From: nsrca-discussion-bounces at lists.nsrca.org
> > [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Bob 
> > Lavey
> > Sent: Monday, March 01, 2010 11:02 AM
> > To: 'General pattern discussion'
> > Subject: Re: [NSRCA-discussion] YS 160 question
> > 
> > Thanks, Bob.  I'll replace that and see if it helps. 
> > 
> > > -----Original Message-----
> > > From: nsrca-discussion-bounces at lists.nsrca.org
> > > [mailto:nsrca-discussion-bounces at lists.nsrca.org] On 
> Behalf Of Bob 
> > > Kane
> > > Sent: Monday, March 01, 2010 10:41 AM
> > > To: General pattern discussion
> > > Subject: Re: [NSRCA-discussion] YS 160 question
> > > 
> > > The check valve should not rotate easily, that sounds suspect.
> > > 
> > > 
> > > Bob Kane
> > > getterflash at yahoo.com
> > > 
> > > 
> > > --- On Mon, 3/1/10, Bob Lavey <rjlavey at hotmail.com> wrote:
> > > 
> > > > From: Bob Lavey <rjlavey at hotmail.com>
> > > > Subject: [NSRCA-discussion] YS 160 question
> > > > To: "'General pattern discussion'" 
> > > <nsrca-discussion at lists.nsrca.org>
> > > > Date: Monday, March 1, 2010, 7:16 AM
> > > > 
> > > > 
> > > > 
> > > >  
> > > >  
> > > > YS 160 question
> > > > 
> > > >  
> > > > 
> > > > 
> > > > Greetings,
> > > > 
> > > > 
> > > > I have a question about the
> > > > YS 160 in my Abbra.  I've got about two dozen flights on the 
> > > > plane/engine, since I bought it (used).
> > > > It's run great up until yesterday, when I barely got one
> > > flight on it.
> > > > I got as far as the square loop in the intermediate
> > sequence (yeah,
> > > > first maneuver), and it sputtered and choked at the top of the 
> > > > vertical line and across the inverted horizontal top line.
> > > I rolled
> > > > it over, and it seemed okay, so I tried again.  Same
> > > result.  I got it
> > > > back down without incident and ran the engine on the bench,
> > > and it was
> > > > lean in the mid-range and top end.  It got very hot during
> > > the short
> > > > time I ran it on the bench, and it seemed to get leaner the
> > > longer it
> > > > ran.  I tried the high-end needle and small rich
> > adjustment on the
> > > > pump, but neither helped.  It ran great last weekend, so I
> > > don't think
> > > > it was a mixture setting.  I then started checking the fuel
> > > lines and
> > > > vent lines, but they seemed okay.  Then I noticed the check
> > > valve on
> > > > the head would rotate.  The one on my other 160 doesn't
> > rotate, and
> > > > since I thought those were a press-fit, it doesn't seem
> > > like it ought
> > > > to rotate.  I gave it a gentle tug, and it didn't come 
> out of the 
> > > > head, but it rotates pretty freely.
> > > > 
> > > > Is that a bad thing?
> > > > Or should I continue looking for an air leak in other
> > places?  Any
> > > > other suggestions?
> > > > 
> > > > 
> > > > Does that check valve just
> > > > pull off, and I can I replace it by just pushing another
> > > one on?  Can
> > > > it be that easy? :)
> > > > 
> > > > 
> > > > 
> > > > Thanks!
> > > > 
> > > > Bob
> > > > 
> > > > 
> > > >  
> > > > 
> > > > -----Inline Attachment Follows-----
> > > > 
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