[NSRCA-dist4] YS-120NC vs. me
verne at twmi.rr.com
verne at twmi.rr.com
Tue May 26 11:15:09 AKDT 2009
Last I knew, Radio South and Central carried them. I've been out of YS Hell now for 7 years or so (2-strokes, then electric)so I haven't paid much attention. Someone else here probably knows for sure.
Verne
---- bruce & sandy <bruceher at bright.net> wrote:
> I got it back together and am putting it in the plane. The brass part of the plunger had noticeable binding when I took it apart. When I put it back together, it worked smoothly. I think the leaking was caused by the brass plunger part sticking allowing the silicon plug to stay open. Also kind of explains why the engine ran fairly good when I seated the regulator adjusting screw and afterwards the rest of the fuel stayed in the tank and the tank maintained pressure------the spring pressure was enough with the adjusting screw seated to keep the silicon plunger plug seated. Hopefully the clean out did the trick.
>
> Now the next problem---I destroyed 2 adjuster screw O rings trying to get them on the screw---dumb thumb deal----next time I'll stretch the O ring over an Xacto handle before I put it over the screw threads. I took the adjusting screw out of another 120 and didn't mess with the O ring! Question is----can I use rubber O-rings instead of the ones you buy in the YS package set? I have one soaking in fuel to see if it swells. I remember years ago I was rebuilding brake calipers. Soaked them in kerosene or diesel fuel-----couldn't believe how big those seals got!!! Well, nobody told me not to do that!!
>
> Verne, I'll keep the Q-tipdeal in mind. Also, I have heard about Leak-Free gaskets----where do you get them. Central Hobbies or what??
>
> Bruce
> ----- Original Message -----
> From: Bob Kane
> To: IN, KY, MI, OH, WV
> Sent: Tuesday, May 26, 2009 9:32 AM
> Subject: Re: [NSRCA-dist4] YS-120NC vs. me
>
>
> 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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