Help tuning a YS 140

[BUDDYonRC at aol.com]

In a message dated 7/4/2005 3:35:54 PM Central Daylight Time,  
adriancwong at earthlink.net writes:

Start  with regulator flush. Set your needle valve to slight rich, then 
adjust the  transition needle. Don't forget, its opposite the main needle valve, 
clockwise  for rich, and counter for lean.

Good  luck.




-----Original Message-----
From: bravo52  <bravo52 at cox-internet.com>
Sent: Jul 4, 2005 12:32 PM
To:  discussion at nsrca.org
Subject: Help tuning a YS 140

Just started  tuning a new 140 (sport) and it hits all the numbers but the 
needles seem a  little off.  I'm at 8200 (backed off a few clicks) on the high 
end and it  idles at 2200.  Transition is smooth and if it sits more than a 
minuete  or so, it loads up.  I'm using an OS F plug and 20/20 fuel.  The  tank 
is plumbed per YS recommendations and I am using a YS fuel filter.   Here is 
the "seemingly" odd part, the high needle is one turn out, the  regulator is 
1.25 out and the idle is 1.25 out.  "Out" meaning screwed  full in.  Any  
thoughts.
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Been running the 140 Sport for a while The hole in the carb barrel  baffel 
for the low end needs to be drilled out to exactly 1/8"  diameter to transition 
properly this information came directly from  YS after drilling out the low 
baffel the low end needle will be open  1-1/2 to 3 turns and the main needle 
will be open between 1-1/4 and 1-5/8 turns.  Six or seven of them were done like 
this locally and they all run fine. #1-1/2  Magnum fuel (30% Nitro) 16x11 APC 
prop they turn between 8600 and 8800 RPM on  the ground They don't like to run 
rich, after setting them up we lean to  max RPM then back off one or two 
clicks.
Good Luck
Buddy 
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