Need Help on YS 61R Long Stroke!!!

[Ihncheol Park]

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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