[NSRCA-discussion] YS-160 round 1...ding, ding

Sun Jun 1 09:00:26 AKDT 2008

All I know is that when it comes out you will have a dead stick problem.
Dwayne

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Troy Newman
Sent: Sunday, June 01, 2008 10:32 AM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] YS-160 round 1...ding, ding

Jason,

Regardless of the peanut galleries comments here is the skinny.

There are two parts...the black plastic check valve....and then the
Brass Injector that goes into the head. The black plastic part can get
loose, IF the injector fuel line is allowed to flop around. This is why
it has a clip on it. Some folks will remove the clip and the fuel tubing
is allowed to flop. Also some folks seem to thing they can remove the
black plastic check valve and re-install it. Nope the Plastic goes on
one time and to remove it the plastic breaks out and the hole is not
larger from the barb damage.

The idea is to not mess with it.

There have been a  few cases of mostly early 160's and mostly a couple
years ago when the brass nozzle came out of the head. I know of 3 of
these and one was in Japan, one in Australia and one in the USA.
Extremely rare, but clean it up and yes I have been told JB weld will
fix it. My understanding is that this nozzle is pressed in with some
kind of adhesive at the factory. So the JB weld is the same kind of
thing....You don't have that problem.

If the engine is allowed to hit the cowl of the model sometime the black
plastic check valve will get knocked around....If it gets loose, just
remove it and hook the fuel tubing direct to the injector nozzle. It
will work fine. The check valve is there for long extended idles, and
quick throttle ups.....Think F-07 Double Avalanche. The check valve
prevents a burp on throttle up.

If you engine is set properly you won't get the burp anyway...but if its
just a  touch lean on the pump...then a tiny air bubble can migrate back
into the injector fuel line. This is because the valve cover is the air
box...and is under pressure...so the high pressure keeps the fuel from
coming out of the injector until the valve on the engine opens. When the
valve opens the pump gives a squirt and the fuel comes out.....

At idle the engine is not using much fuel at all....and the injector
will leak a little fuel into the valve cover area....If the engine is
too rich (pump)...this is what causes it to get a rough idle. If the
pump is too lean then there is not enough fuel in the line and the
pressure in the line is lower so the air box pressure pushes the fuel
back in the injector line and right at the very end of the in injector
line forms a little air bubble.

The black plastic check valve prevents this from happening.

So the long story aside if its flopping around pry it off with a large
flat blade screw driver, just slowly inch it off...then hook the fuel
line direct. It will work fine.

By the way the new 170's have a different clip on the injector line that
keeps the fuel tubing from flopping around. This keeps the black plastic
from turning and getting loose on the injector nozzle.

The peanut gallery can now continue their comments.

Thanks
Troy Newman

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of JShulman
Sent: Sunday, June 01, 2008 8:06 AM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] YS-160 round 1...ding, ding

Oh yea... the check valve. Regs in front... duh. Where do I plug in the
battery???

I'll check it and make sure I'm just seeing things. We're still learning
about the new YS's. Maybe it always swiveled and I just now noticed it.

Regards,
Jason
www.jasonshulman.com
www.shulmanaviation.com
www.composite-arf.com

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Mike
Hester
Sent: Sunday, June 01, 2008 10:35 AM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] YS-160 round 1...ding, ding

You mean the check valve? It is press fit. It swivels =)

As long as it's not loose, it's fine. Sometimes the fitting comes loose
from the head where it's just pressed in. If that's the case, JB weld.
But the black part just presses on to that.

if you mean the part that attaches on to the pushrod tubes, it's just
plastic and if it's moving excessively, something might have broken.

-Mike

----- Original Message -----
From: "JShulman" <jshulman at cfl.rr.com>
To: "NSRCA" <nsrca-discussion at lists.nsrca.org>
Sent: Sunday, June 01, 2008 10:12 AM
Subject: [NSRCA-discussion] YS-160 round 1...ding, ding

> Sooooooooooo.... how do we tighten up the regulator (black piece at 
> valve
> cover) on the top of the motor? It seems that this one has come loose 
> as it will swivel back and forth.
>
> BTW Chris... I am still flying electric <G>
>
> Regards,
> Jason
> www.jasonshulman.com
> www.shulmanaviation.com
> www.composite-arf.com
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