re ys 1.20

[Anthony Abdullah]

I have to agree with the 120 FZ being the very best. I would definitely go that route if you have a choice. I have mine in a nearly 11 pound full two meter Epicure II and it will go verticle out of the box on YS 20/20 fuel and 16x10 prop. It came out of the box with a broken head shim that YS fixed for free (as they should've) and, knock on wood, has run great every day since. After two planes and two years it is still on the original cylinder and bearings and feels smooth as silk.  I love all the new engine choices as I am a 2 stroke flyer at heart, but they can have my YS120 FZ when they pry it from my cold dead hand!

Bob Kane <getterflash at yahoo.com> wrote:My NC did have the opening in the gasket, did not seem to make any difference. 

"Atwood, Mark" <atwoodm at paragon-inc.com> wrote: Side mounted NC's required a minor mod to the rear gasket of all things. A small notch in the gasket (which was eventually put into production) prevented fuel from loading up one chamber while at idle on it's side. Made a HUGE difference once I "snipped" it. (Fix courtesy of Mr. Mattie...)

Have to agree though...the SC was the worst.


-----Original Message-----
From: Bob Kane [mailto:getterflash at yahoo.com]
Sent: Sun 5/18/2003 9:58 AM
To: discussion at nsrca.org
Cc: 
Subject: RE: re ys 1.20

That's why I said some people have good luck with them. I know yours runs well, and I believe Randy Wolf ran 120NC's also when he was competing. But I also know that mine, and apparently many other others had a problem running rich on the low end, and the usual fix of drilling out the air bleed hole did nothing to fix them. Side-mounted engines seem more suseptable to this problem than upright or inverted. Mine was side-mounted.


"Thomas C. Weedon" wrote:
Hey, Bob, I will have to agree with most of your conclusions except the 120NC. I have two 120NC's. They are not as powerful as the newer models, but they are easy to run and so far, very reliable. I have only done the minimum maintenance on then. Great for sport engines. I got rid of my SC's. They were the worst of all YS engines. I also agree that the YS120FZ will suprise most with it's power and ease of use. I have 2 of them and won't give them up. The 140FZ is great also.
Tom Weedon
-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On Behalf Of Bob Kane
Sent: Saturday, May 17, 2003 3:58 PM
To: discussion at nsrca.org
Subject: Re: re ys 1.20


Best to worst big YS four strokes IMHO, in terms of reliability and ease of use:

YS120FZ YS140FZ
YS120AC
YS120FS
YS140L YS140DZ
YS120SC
YS120NC

I own or have owned the 120NC! , 120FZ and 140FZ motors, and have direct experience with the L and DZ series. Of the 120's, the FZ is the best version. My 120FZ is as strong as my 140FZ's. The 120NC I owned was junk, even two trips back to YS and several versions of throttle barrels did not make it right. Some people have good luck with them, I did not. 

The AC is good, but not as powerful and heavier. The SC is powerful, but has a tendency to eat itself without warning. The older FS motors are good, just not on par with the newer ones in terms of power.

If you are shopping, pick up either a 120FZ or 140FZ. Lots of fliers are moving to the big two-strokes or YS140DZ's, so finding one should be relatively easy.


S & A North wrote:
HI any chance someone could list in order best to worst version of ys 1.20 to buy.i do not know the diff between a nc fs fz.can anyone enlighten me please?thanks.........shel


Bob Kane
getterflash at yahoo.com 

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Bob Kane
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Bob Kane
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