[NSRCA-dist4] YS-120NC vs. me

[Bob Kane]

I was thinking about this again, assuming all the parts check out OK,  there might have been some piece of something stuck in regulator. Would not take much to cause the leaking you experienced.

 Bob Kane
getterflash at yahoo.com




________________________________
From: bruce & sandy <bruceher at bright.net>
To: "IN, KY, MI, OH, WV" <nsrca-dist4 at lists.nsrca.org>
Sent: Monday, May 25, 2009 7:21:09 PM
Subject: Re: [NSRCA-dist4] YS-120NC vs. me

 
OK Bob,
 
All of the parts, except for the gasket of course, 
are soaking in fuel.  Tomorrow I will re assemble the parts.  
Everything looked OK including the small silicone part of the plunger.  I 
know that it has to seal the hole in the center of the regulator body and I 
couldn't see any irregularities which would prevent that.  ( I'm 
beginning to think it really was a new engine).  I am going to order a 
couple of diaphragms, plunger assemblies, springs, and at least one gasket 
set.  I have several YS 120s, and one of them I know has a home made gasket 
for the regulator----I haven't tried to run that one yet.  It also had a 
drilled out exhaust port on the head which I didn't notice---ended up sending 
the head to Clarence Lee and he put a brass adapter in the head so we are back 
being able to use standard header threads again---live and learn.
 
Bruce
----- Original Message ----- 
From: Bob  Kane 
To: IN, KY, MI, OH, WV 
Sent: Monday, May 25, 2009 6:44 PM
Subject: Re: [NSRCA-dist4] YS-120NC vs.  me

>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.

 Bob Kane
getterflash at yahoo.com 




________________________________
 From: bruce & sandy  <bruceher at bright.net>
To: nsrca d4 list  <nsrca-dist4 at lists.nsrca.org>
Sent: Monday, May 25, 2009 7:08:00  AM
Subject: [NSRCA-dist4]  YS-120NC vs. me

 
Hi Guys,
 
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!!
 
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.
 
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.
 
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.
 
Sorry about this, but I don't have anybody to  talk to.
 
Thanks,
 
Bruce

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