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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › YS 56 SR problem
01-19-2010 01:35 AM  8 years agoPost 21
DS 8717

rrProfessor

Here wishing i was somewhere else

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Quote
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If you change the mid range setting you have to readjust the high end to compensate for the change.If you lean the mid needle you have to richen the high needle or it will be too lean..
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So do you do opposite when you richen mid you lean hs ? So you have to balance each if you move one or the other. Is that what you are saying ?
Yes,both the high end needle and the midrange needle supply fuel to the wide open mixture,they are 2 seperate channels in the carb barrel that feed fuel to the main fuel outlet in the carb. What you want to do is set the midrange needle first and then fine tune the wideopen mixture with the high end needle,if you change the mid needle after setting the high end needle you need to readjust the high end needle to get it tuned for wide open again.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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01-19-2010 02:13 AM  8 years agoPost 22
Parsifal

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Singapore

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Thanks, that bit of info really helps having not much experience on the 3 needle YS. much appreciated.

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01-19-2010 02:20 AM  8 years agoPost 23
DS 8717

rrProfessor

Here wishing i was somewhere else

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The YS 80and YS 61 ST2 ( they used the same carb on both motors)carb had 3 seperate fuel outlets in the barrel with 3 seperate channels feeding each outlet in the barrel,all the other YS 3 needle carbs have 3 seperate channels in the barrel that dumps into 1 outlet instead of 3 like the 80.Each of the 3 needles has its own fuel suppy passage from the regulator,with a channel that uncovers the passage for each needle as the barel rotates. The idle passage stops functioning after 1/4 throttle,the mid needle function from 1/4 to wide open throttle so it has an effect on wide open and midrange.The high end needle only function from 3/4 to wide open and has no effect on midrange mixture.
On the OS carbs all three needles overlap and have effect on each other,ie: idle effects mid range,mid range and high end overlap at 3/4 opening. If you understand how the YS needles work it is a much easier set up to tune than the OS because idle needle only effects idle and midrange only effects midrange, the idle and high end needles have no effect on midrage setting. So what you do is set the idle needle for a good idle and leave it alone,then set the midrange needle for a good rich midrange,then tune the highend needle for wide open.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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01-19-2010 11:51 AM  8 years agoPost 24
SC Raptorman

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South Carolina

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Thanks all for the info in how the YS carb works , its all coming together and making sense now as I have been used to OS settings overlapping .I can see where it will be easier to understand the YS setting from now own . The more I look at it the better I like the YS method of setting each channel .

Oh what a feeling 3D Flying can be
Magnum Fuels

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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › YS 56 SR problem
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