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YS FZ110 bangs, HELP!!!!

Old 02-24-2015, 04:53 AM
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westy1957
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Default YS FZ110 bangs, HELP!!!!

Hi!
Seeking help from people who know this wonderful engine that for a while I can no longer operate properly.
The engine runs more "smooth" but tends to make the sound of shots, I do not know how to explain .. and giving gas increases the noise of shots and about half the gas is stopped abruptly. Even as a result often becomes loose propeller nut ....
Point out that the engine is at the first start after I had sent (2 years ago) to repair (for the same reason, because I was not more out) by Naohisa Yamada, and of which I enclose also the expensive bill ...
Today, I decided to reassemble on my fun-fly ... the same problem !!!!
precise:
the tank is properly pressurized.
The mixture used is one in photo (Rapicon Air 30%).
Propeller 1X8.
Candle OS F.
Checked valves open and not glued, but "not" controlled thicknesses.


Please help me !! This is a fantastic engine and I want to make it work properly again


VIDEO: https://www.youtube.com/watch?v=iB_2nmVay_o&list=UUdsI7KBssQMrrzO-g21fpsg











Old 02-24-2015, 07:03 AM
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westy1957
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I was:
HS needle: 1+1/2 turns
minimum air screw: 1+1/2 turns
valve regulator screw: flush with carter
Old 02-24-2015, 07:49 AM
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its going lean on you. since it has been two years some of the old fuel/oil may be very thick and needs to get worked out. First open the needle about four turns and try again. run up very slowly to help it build good pressure and run at half power or so for a minute or so. if you cant advance engine from there just means its not getting enought fuel and need to clean/replace diaphram.
Old 02-24-2015, 09:40 AM
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Ok. I will start with 3-1/2 turns HS needle.
But how can I know when stop closing it?
Old 02-24-2015, 11:36 AM
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once you have it at full powerit shoul be very rich slowly start closing the needle. then engine will start to clear up and come on song. once it does you are very close. just look for the smoke as you want a decent smoke trail. fly it this way a coupl of times to break it in maybe a gallon or two and then can start leaning it some. just go slowly and if go to lean while at full power you will hear it make a different sound and you will know. try to get it going and see how she does.
Old 02-25-2015, 12:52 AM
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prop used:
wood 15x8
APC 16x6
APC 16x4w

What do you think is better?
Old 02-25-2015, 07:16 AM
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APC 16x6
Old 02-25-2015, 08:25 AM
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what do you think now:

http://youtu.be/CzTAn3o0NoI?list=UUdsI7KBssQMrrzO-g21fpsg
Old 02-25-2015, 10:51 AM
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looks pretty good to me. i will have to listen to it at home as at work now on tiny speakers. looks a bit lean on low end. Top end is rich but thats good. could lean out top end by two clicks. also turn in low end by 1/8th turn

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