YS 91 AC problem

[Paul Horan]

Ihncheol,
    Thanks for the reply.
> If you have a lot of bubble or didn't have bubble prior to the crash,
check
> the regulator assembly.
   I bought this plane from a friend, so I do not know how much bubble there
was before.
I have changed the fuel tubing from the pump to the carb and will retry.  My
guess is that the bubbles are not the problem.

> Are you talking about the throttle stop screw?
Yes

> If you don't have the throttle stop screw, the throttle barrel may move in
> and out slightly although there is a seal on it.  It get torn easily if
the
> throttle barrel is not inserted smoothly. (I tore a few when I install
> throttle barrel)  The center of the throttle barrel has tiny slot (I do
not
> mean the hole).
This may be the problem, before the throttle stop screw was removed the idle
mixture did have an affect - now it does not.
Where do I go from here ?   I suppose wait till I have the new throttle set
screw in.  If
that does no correct the problem then explore the throttle barrel seal.

 Thanks,
Paul
----- Original Message ----- 
From: "Ihncheol Park" <PatternFlyer at msn.com>
To: <discussion at nsrca.org>
Sent: Thursday, May 15, 2003 7:37 PM
Subject: RE: YS 91 AC problem


> Paul,
> sorry to hear about the problem.
> For correct part name check the link.
> http://www.centralhobbies.com/Engines/parts/YS91ACEX.html
>
> I believe small amount of tiny bubble between the regulator and carb
during
> idle is normal.
> If you have a lot of bubble or didnot have bubble prior to the crash,
check
> the regulator assembly.  Get a small magnifier to look at the diaphragm
for
> any crack.
>
> Are you talking about the throttle stop screw?
>   "The idle adjust scred broke off and with help it has been removed, I am
> now
> running without the set scred."
>
> If you don't have the throttle stop screw, the throttle barrel may move in
> and out slightly although there is a seal on it.  It get torn easily if
the
> throttle barrel is not inserted smoothly. (I tore a few when I install
> throttle barrel)  The center of the throttle barrel has tiny slot (I do
not
> mean the the hole).
> This may cause idle problem.
>
> I suggest you to check the throttle barrel (including the idle adjustment
> needle valve removed) and carb for any blockage.
>
> I am sure you cleaned up inside the engine just to make sure nothing went
> through the carb.  Right?
>
> After checking all the above, reset the valve clearance, then, try again.
> Hope this helps,
>
> Ihncheol Park
>
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