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YS-115 Rough on Idle

Old 06-26-2012, 07:11 PM
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Default YS-115 Rough on Idle

New motor inverted starts up good and when on the ground, guns up good on 20-20 fuel. Backing down to idle, runs OK for 30-60 seconds then dies. Sometimes runs backward if trying to kill motor. It it too rich?

AC
Old 06-27-2012, 06:25 AM
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Default RE: YS-115 Rough on Idle

Give us some more info:
1) Prop
2) Plug
3) which fuel
4) RPM at idle and WOT
5) does it slow down and die or speed up and die

I have posted this link a lot:

http://www.julton.net/Fact%20Sheet%20YS%20Engines.html

Worth a read.
Old 06-27-2012, 09:43 PM
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Default RE: YS-115 Rough on Idle

That is an excellent article on operating YS motors...have read it many times.

on my FS-115
Prop - APC 14x8
plug - OS-F
Fuel - Power Master 20-20
Have not tached the high end or low end yet...will do that tomorrow night when I run up motor
another problem I noted was no tank pressure when opening the vent line stopper! Maybe my check value was backwards - doubled checked with instructions
another thing I noted was the low end valve was turned out 3 & half to 4 turns - way too rich - am backing it down to 1 & half turns open
Old 06-28-2012, 05:09 AM
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Default RE: YS-115 Rough on Idle

The low end is an air-bleed. out leans it and in richness it.

No tank pressure is huge issue. we need to find the cause of that first.
Old 06-28-2012, 08:14 PM
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Default RE: YS-115 Rough on Idle

Thanks, I finally got steady low end rpm at about 2,200. High rpm pegged at 11,100. I think my problem was an inverted check value. Tonight the vent line had good pressure when releasing it. Also I kept adjusting low end 1/8 of turn - clockwise and the low end settled right down with no reverse running when throttle was closed all the way. I thinks its ready for the maiden.

AC

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