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

[bruce & sandy]

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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