<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:12pt">From what you describe the regulator is no longer regulating. The regulator has 8 parts, the gasket, regulator body, regulator screw, o-ring seal for the regulator screw, the spring, the regulator plunger (looks like a small poppet valve, made of brass) and two other key parts, the diaphragm and the plunger "tip", both made of silicone. The spring is probably OK, but I'll bet the diaphragm and the regulator "tip" need replacing. I think you have to buy plunger and tip together, the diaphragm you can buy by itself. They are not difficult to rebuild, just pay attention to which side of the gasket the diaphragm goes on.<br><div> </div>Bob Kane<br>getterflash@yahoo.com<div><br></div><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><br><div style="font-family: times
new roman,new york,times,serif; font-size: 12pt;"><font size="2" face="Tahoma"><hr size="1"><b><span style="font-weight: bold;">From:</span></b> bruce & sandy <bruceher@bright.net><br><b><span style="font-weight: bold;">To:</span></b> nsrca d4 list <nsrca-dist4@lists.nsrca.org><br><b><span style="font-weight: bold;">Sent:</span></b> Monday, May 25, 2009 7:08:00 AM<br><b><span style="font-weight: bold;">Subject:</span></b> [NSRCA-dist4] YS-120NC vs. me<br></font><br>
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<div><font size="2" face="Arial">Hi Guys,</font></div>
<div><font size="2" face="Arial"></font> </div>
<div><font size="2" face="Arial">Need a little help/advice here. Trying to get
this YS-120NC running that I bought several years ago. I think it was
supposed to be new, but you know how that goes. I think it's a regulator
problem, but I have almost no experience with regulators. I'm sure you
realize how rare someone with YS engine experience is in and around Quincy,
Ohio!!</font></div>
<div><font size="2" face="Arial"></font> </div>
<div><font size="2" face="Arial">First attempts--High speed needle about 2 turns
out. Regulator adjusting screw even with top of regulator housing.
Finally got a real rough idle (think I turned regulator adjusting screw in
slightly). Advancing throttle killed it right away, indicating a real rich
idle. I was tired and put plane in barn. While I was away all of the
unused fuel syphoned out of the tank on to the floor (no biggie,
remember it is a barn!). Hard to tell where it leaked out (inverted
engine) imagine it came out the carb intake, but it certainly came through
the regulator.</font></div>
<div><font size="2" face="Arial"></font> </div>
<div><font size="2" face="Arial">In desperatiion, yesterday I screwed the regulator
adjusting screw all the way in until it seated. Don't think I backed it
off at all. Engine started with a kind of rough idle. Transition to
full throttle (needle 2 turns out) was good. I didn't play anymore.
Imagine if I back off the adjusting screw to get a smooth idle, the unused fuel
will again syphon out of the tank.</font></div>
<div><font size="2" face="Arial"></font> </div>
<div><font size="2" face="Arial">So, you YS wizards, what do I do? If I
should replace the diaphram in the regulator, do I replace the spring
too? Guess replacing the gasket is a given.</font></div>
<div><font size="2" face="Arial"></font> </div>
<div><font size="2" face="Arial">Sorry about this, but I don't have anybody to talk
to.</font></div>
<div><font size="2" face="Arial"></font> </div>
<div><font size="2" face="Arial">Thanks,</font></div>
<div><font size="2" face="Arial"></font> </div>
<div><font size="2" face="Arial">Bruce</font></div></div></div></div><br>
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