Need Help on YS 61R Long Stroke!!!

[Bill Carpenter]

Ihncheol,

You probably ruined your diaphragm with the after run oil - you can only use
a non petroleum based oil like Ultra Oil.  Replace it and try the following
setup:

APC 13X10 (windy conditions) or 13 1/2X10 (calm days) prop.
15% nitro.
O.S. #8 plug or K&B 1L.
Hatori 650 pipe.
>From the glow plug to the first ring on the pipe measure 20 inches straight
back.

This should idle way down and provide plenty of power for any airplane up to
about 9 lbs. dry.  Throttle transition S/B excellent and downlines can be
very slow with the larger prop at low idle.

Hope this helps, Bill


----------
From: "Ihncheol Park" <PatternFlyer at msn.com>
To: <discussion at nsrca.org>
Subject: RE: Need Help on YS 61R Long Stroke!!!
Date: Mon, Apr 28, 2003, 1:37 AM


OOps,
wrong click on the last one.

I am not an expert, but here goes.
The idle is still a little too high.  My YS 61LS idled at 2000rpm with 13x8.
I could go lower.

Have you checked the Diaphragm?
As basic maintenance, cleaning the needle valve assembly is also a good
idea.

When I take out a previously stored engine, I try to clean out the oil (I
use Mobile 1 Synthetic oil) with fuel.  Remove glow plug, use starter to
turn the engine that was hand primed before using starter.  Flood it so that
the old oil get mixed with fuel and drained out to plug hole.  (Make sure to
cover the plug hole with rag to prevent fuel/oil splash).

I am not sure about Prather's after run oil.  never tried it.
Also, I don't use castor anymore.  I had to clean one of OS pump because of
the castor residue.

Hope this helps,

Ihncheol




-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On
Behalf Of jed241 at msn.com
Sent: Sunday, April 27, 2003 7:18 PM
To: NSRCA
Subject: Need Help on YS 61R Long Stroke!!!

I'm having problems with the engine leaning out on transition to full
throttle. The engine is in a 60 size pattern plane. The set up is unchanged
from when I bought it. However, both engines have been sitting in a sealed
bag after a good oiling with prather after run oil.

The pressure in the tank is fine and builds up to 6psi, measured on a
pressure gauge. I'm confident that there is no air leak as it holds the
pressure in the tank. Idle seemed to be very steady with no sign of dying at
2,700rpm. Would also like to know where the reliable idle RPM is..

I allowed the engine to run for about 15 to 20 seconds at about 4,000rpm and
as I slowly increased to half throttle or about 7,500rpm, it would
immediately die. I took the head temp and it was about 250F. I changed the
engine out with a back up and it did the same exact thing. Again, same
results on both engines. I also change the glow plug and as expected it
didn't change anything.  I haven't checked the fuel filter, but I will
shortly. The regulator is adjusted to flush with the case.

The original engine had about 25 flight on it ,and the back up is a brand
new rebuild with new piston, sleeve, bearings, etc
)

Setting aside the fuel filter, is there anything else that I'm missing?

Wildcat 15% Nitro w/ 18% Oil (80% Synthetic/ 20% Castor)
12x11N APC Prop
Hatori Pipe
OS #8 Plug

Thanks,

Larry
NSRCA 3083
AMA 5024

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