Ok I've got the 110 mounted on my Big Boy and ran it this evening. It started like a champ and from 1/4 to 12 throttle it transitions great, but from an idle it's slow to get up to speed. Granted, I didn't check rpms yet and it seems to be idling too slow. I'm thinking it's the low speed needle needing adjustment. From full T I bring it back to idle "bam" and it idles fine but in a few seconds it starts to slow down to a putter. I tried to use my trim to up the idle but it doesn't seem to have any effect. That may be a servo setting issue. I'm excited anyway because this thing has some major power and I'm positive it will have more than the G26 I had on it. I did back out on the low speed needle some,,,, maybe I'll get anothe chance tomorrow.

I have a suspicion that it may be too lean and not too rich, but I've been wrong before. Set the idle about 22-2400 and back the regulator screw out about 1/4 to 1/2 turn. See if that improves the situation, and let us know.

Thanks,
D

I'm going to use this thread because it's about the same engine. OK. I'm using fuel from the same can for both my engines so I don't think it's a dirt issue. One runs like a watch and the new one, the one I just got back from YS is giving me some problems. I'll try to explain it and maybe you can help me. I went to the field yesterday and after a tank of fuel I had given up. I start it, it starts very easy. Let it warm up about a minute at about half T. Ease it up to full and set the high needle to top RPM and back off a few clicks till it gives me some smoke. Bring it back to idle. It was too slow, I mean just barely running so I had to set the servo trim up to get it to idle. When try to go back to full T it dies and fuel runs out of the carb. Kept working at it making very small adjustments to the regulator, never moved it past 1/4 out or in. I finally got it to transition, though not without some blubbering. In other words it won't quickly go to full T. Anyway I put the wing on and taxied out and it died when I tried to throttle up for take off. We started it again and I ran it up to clear it and brought it back down and took off. Flew it for 10 minutes and set for landing but it was idling too fast I guess because I had to keep trimming back to get it slow enough to land. Thing is, everytime I came in too hot I throttled up and went around again and it ran ok, never getting over half throttle. Finally got it slowed down enough to land but it died when I turned around and gave it more throttle to get it back to the pits. I tried doing what you said above but that actually made it run worse. You said use the idle at 2220-2400 but isn't that kinda fast? Sounds fast to my ear.

2200 to 2400 is about as slow as I like. You may be able to get to 2000, but only if the engine is well broken in.

How far open is the HS needle? Backing off "a few clicks" may be too much. YS engines don't like being too rich on the top end, if fact, sometimes two clicks is too much depending on the fuel and weather.

Fuel running out the carb indicates that a piece of debris is holding the regulator plunger open and allowing the pressure in the tank to push fuel into the carb. Or it could be the plunger is sticking.

If it blubbers in the transition and barfs out raw fuel and a cloud of smoke when you advance the throttle, the reg is too rich. If it stumbles, with no smoke or raw fuel out the exhaust, it is too lean. Don't be afraid to run the reg in or out by a full turn if you have to.

Still sounds lean in the mid range to me.

Thanks for taking the time to help Dave. In transition it smokes nicely but it doesn't go full T without some working of the stick. Perhaps it's smoking excessively, I'm just not that familiar with it how it's supposed to look. My other one doesn't smoke quite as much in transition. I set the top end and come back "a few cliks" till it gives some smoke, not a lot mind you. I was a little afraid I would get it too lean. You wrote "Still sounds lean in the mid range to me. ", in the middle of the throttle movement it smokes quite a bit. Would it do that if it was too lean. I'm assuming mid range is about mid throttle??. Here's some Q's. Do you reset the top end after each reg. adustment? How fast should the transition to full be able to be made? When making adustment to the reg screw, how much do you move it each time? Where in all of this does the low speed adjustment come in to play?

Finally, if it's lean in the mid range, I would open the reg screw some, right?

Lots of smoke in the midrange would indicate that it's rich but some of the other things you are describing makes it sound lean.

Next time you run it, fire it at about 1/4 throttle and let it run for a minute or two before you go to full throttle. Let it go full throttle for about 30 seconds then set the HS needle. Use a tach if you have a tin ear. You only want it 200 or 300 off the peak at full throttle. That's usually about 2 clicks at most. If you go 1/4 turn that is way too much.

Then pull it back to a fast idle, maybe 3000 to 3500 or so and listen to it. If the rpm increases a little, richen the reg a bit, if it starts to slow down gradually lean the reg a bit. I go 1/4 turn at a time until it's about right, then 1/8 turn. Then go to full throttle and see if it barfs out a bunch of smoke and raw fuel. Keep going from the from the high idle to full and keep adjusting the reg until you get it right. Every time you make a regulator adjustment, go back to full throttle then down again to check it. Bear in mind that it's better to be just slightly rich in the mid range than lean, but just a little.

After clearing it out at full throttle and being satisfied with the transition, drop back to idle at about 2000 to 2200. Let it sit there until the idle rpm increases or decreases. If it does neither, it is set correctly. If the rpm rises slowly, it is too lean. Correct this by screwing the idle screw in (clockwise) 1/8 to 1/4 turn at a time until you are satisfied that the idle is steady. On the other hand, if the idle gradually slows down, it is too rich and you will need to go the opposite way on the idle needle.,

One more thing, check the valve setting. It should be .003" on both valves. If the valves are too tight the engine will not idle or transition well.

Hope this will help.

Thanks a lot for the detailed instructions. One other thing, what should the top end rpm be for the 110 with the APC 16X6? If my tach is correct, I'm turning well over 9000 rpm.

That's about right. Some of the funfly guys are running them over 10000 at full throttle. Try the 16.6x 5.5 APC. It was made especially for the 110.