Hi, Thought I'd pass on this simple fix. Last flying season I started having problems with my fast idle. At about 2700 rpms my engine would surge up in rpms then back down to about 2000 rpms continuosly. I read of a plunger replacement here on RCU and decided to just fly some of my other planes and put this one away for awhile. Thinking I needed a new plunger I called Richard at YS Performance and explained my problem. He said it sounded like my idle screw was set to lean. He suggested to richen it up by screwing in the idle screw. I arbitrarily screwed it in 1/2 turn and today I went to fire it up. It runs flawlessly!! Perfect transition from 2200 to about 9300 rpms. It will idle forever without surging or lagging. Transition to full throttle is instantaneous. My YS 110 is BACK!!

good to hear pal, I am about to fire up both of my 110's next week as I am waiting for spinners to come in from True Turn, cant wait!

matt

Hello,

It took me a while to get the idle screw setting down on the 110. I have 2 other YS's (120 NC, 140 DZ), and neither has an idle screw adjustment to mess with. The thing about YS is that we cannot do the pinch test to determine idle adjustment status like you can w/ normal engines. We have to judge the idle setting by the way it transitions and/or the way it quits.

Last week I changed fuel from Power Master 20/20 to Wildcat Youngblood Heli 30%, and the idle quit after 2 minutes while I was chatting with a buddy. I made a little adjustment, and it will now idle forever until fuel runs out.

I do think that the 110 won't begin to show its true colors until after 2 gallons, as it is quite a bit more powerful and reliable. I am really happy w/ the new Wildcat Youngblood Heli 30%, making this engine spin APC 16x6 @ 9900 rpm. That's 400 more than Power Master 20/20 and 100~200 more than Cool Power 30% Heli.

Wow, 9900 with a 16/6 APC! I'm using the same prop with Cool Power 20% Pro pattern and can get about 9400 max. I may try some of that Wildcat 30%. Although before the surge o rama I had tons of power compared to the Saito 100 I had in the plane before.

Had the same surge problem. I called richard and he suggested screwing the idle air bleed all the way in. I did and the engine runs great! Idles for 30 seconds and transitions good enough for me. I think the key is to use the idle air bleed for very fine tuning...

Bodyworks, Richard also told me to screw the idle screw all the way in but I just did the half turn in to see what would happen. Since it fixed my problem I left it there but if it happens again I will continue to screw!