120 NC Mods?
 

I posted this under the YS Support forum but I'm affraid it might take to long. So I am posting it here in hopes that someone might know.

I have a YS 120NC that runs extremely rich on the low end. I ran it last year but I had to really crank in the regulator in order to get it to idle. I thought I read somewhere that you could drill out the hole in the throttle body a little larger and it cleared up the rich low end. Is this true? If so how big do you enlarge the hole to? Would a 1/16th be in the ball park?

Bigger
 

Start with a 1/16. Mine is at 3/32 and could go even a bit larger. The regulator is in a bit and I have the perfect motor now (although it is getting old and tired and has just about zero compression when cold, it runs like a top and yanks the CGM Ultimate around like a yo-yo).

Other things to consider.

1. It started to run awesomely after the third or fourth gallon.

2. It thrives on Coolpower 30% heli

Mark

120 NC Mods?
 

I bet I am not far from bottoming out the regulator. It is really in there. I went through it and replaced the diaphram, adjusted the valves and put a new set of leak free gaskets. I put it in my first pattern plane (Finesse 120) with a bolly pipe. I set the regulator screw back out to flush and it is way to rich on the low end. I didnt want to have to crank it in again. I fired it up last night with a APC 15x10. I didnt put a tac on it but man that prop was ripping.

120 NC Mods?
 

Try a 15x11 and see how you like it. The Finesse 120 is an awesome plane.

Chris

120 NC Mods?
 

Looked at the local hobby shop today and they didnt have any in stock. I maiden it this weekend with the 15x10 and order a 15x10 or 15x12. I can't go to big because then I will loose ground clearance. We fly off of a grass field.

120 NC Mods?
 

Man-O-Man...you guys just saved me a bunch of headaches....and money for a couple of bottles of asprin!!!...I have 2 YS 120's that have been giving me headaches....they are both on the shelf cause I got so frustrated...actually one of them is an SC model come to think of it...is this mod approporate for the old SC model engines???...I love this forum!!!...thanks for your help...


P.S. I have a YS 91 that is sooooo sweet...I could never understand the troubles with both of my 120's....

120 NC Mods?
 

15x11 is really good for grass. You'll love the plane. Enjoy it, any pics.
Chris

120 NC Mods?
 

Here you go Hover King. I am excited. This is my first pattern plane. I picked it up this winter from a guy in my club. The plane is ready to go. Just waiting for some decent weather.

http://www.alaskarc.org/mike/finemess.jpg

http://www.alaskarc.org/mike/finemess2.jpg

120 NC Mods?
 

Nice, I like that color scheme alot. Have fun with it, and good luck for the season.
Chris