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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › I'm a little confused about tuning with three needles (ys56)?
04-06-2010 10:41 AM  8 years agoPost 1
12 volts

rrNovice

Sunnyvale, Ca.

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I was hoping you guy's could give a few tips on tuning the ys56. My ys 50 has two needles which I tune with the finger on the backplate. But for my new kit I'm using a brand new ys56. My question is , how to tune a engine with three needles? Also since I need to break it in,
do I disable the gov? My forward Flight is just beginning, back and forth slowly. Hope this helps.

P.S. I belong to a good club with lots of help, but thought I'd ask your opinions anyway. Thanks for any tips.

- Steve

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04-06-2010 01:17 PM  8 years agoPost 2
James3922

rrApprentice

Scotland

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You'll enjoy the 56, it's excellent.
What pipe, fuel and plug are you using?
Typically the low end won't idle nice unless it's a little rich.
My advice is to go very slowly, making small adjustments. It'll take you longer to get it tuned but you will get to know the engine better in the process and you wont damage anything.
The factory recommended settings are good for initial starting as they are rich.
The YS needles do not behave the same as an OS.
The high end needle is the one that requires a screwdriver. The "Hover" needle can be adjusted by finger and thumb.
After initial run-in, I tuned mine on the gov at 1850 HS.
This meant that I was between the high and hover needles with both affecting tune.
I ignored the high and tuned the hover just by back-plate temp and hovering steadily. Then I started flying gentle circuits.
The engine would bog a little and produce too much smoke when flaring at the end of a 45deg approach. When I leaned the high to compensate, the engine would be too lean in the hover.
Little by little I leaned the high and richened the hover until the top started showing signs of being lean. Then I backed-off on the high slightly.
I tune my engines mostly by back plate temp but obviously also by smoke output.
I'm flying Opti-fuel 20% with an Outrage 56 pipe and the engine is very easy to "read". When it's lean there is little smoke, the pipe is a little raspy sounding and the heli's tail kicks slightly.
As long as there is always enough smoke coming out of it you'll
avoid being too lean.
Best of luck.

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04-06-2010 01:56 PM  8 years agoPost 3
Chuckie

rrKey Veteran

Crofton Maryland

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The high end needle is the one that requires a screwdriver.
This is not correct. Both the high and mid are turned by hand with the needles. The mid sticks out further. The slot for the screw driver is the idle needle.

James' other comments are good to follow.

I tune my engines by how it performs while doing maneuvers like full speed climb outs, tick tocks, tail slides, and rainbows. With the 3rd needle on the YS you can fine tune the mid range point just like the bigger 91 size motors. In fact the process for tuning both motors is the same. I look for smoke output and listen to how the motor sounds when loaded and transitioning between mid and high during maneuvers. You will need someone to help you tune the motor if you cannot perform some of the these maneuvers but in the mean time the stock settings will get you going and as long as the motor is not run lean you won't have a problem.

The main thing to understand about the YS carb is on the 56, just like the 91SR, the mid needle sets the overall fuel flow into the motor. If you adjust the Mid both the midrange and high side are affected. High needle only affects the high side above 75% or so throttle. So, if you lean the mid too much it will lean the high side. On the OS91 motors the high needle sets the overall fuel and you use the mid to reduce fuel in the mid range.

Please stand by for faster service!

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04-06-2010 02:05 PM  8 years agoPost 4
James3922

rrApprentice

Scotland

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Hi Chuckie,
This pic shows the 56SR. The low needle is on the other side.

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04-06-2010 02:10 PM  8 years agoPost 5
Jgatorman

rrVeteran

Birmingham, AL

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The high end on my Ys56 absolutly requires a screw driver and the mid is a finger screw. This design is specific for once the high is set it should require very little if any tuning the mid will need to be adjusted on occasion. This is working for me and I was provided this ifo from Henry Caldwell who still is flying his prototype ys56 and has over a thousand tanks through it.

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04-06-2010 02:18 PM  8 years agoPost 6
Jgatorman

rrVeteran

Birmingham, AL

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I am to new to nitro but the way I was shown by Bobby Watts and Henry Caldwell was to set the high first by doing tic tocs rainbows or very fast circuits bring then bring the heli in check temp and continue this procedure till temp gets to approx 200 degrees, then start adjusting the mid by doing full collective punchouts till engine sounds happy. I reccomend watching the smack talk video on engine tuning it worked for me.

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04-07-2010 09:22 AM  8 years agoPost 7
12 volts

rrNovice

Sunnyvale, Ca.

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Thanks for all your reply's. Should I disable the gov during the break in process? Also I'm using a hatori sab-55 pipe, cool power 30% fuel, and an os# 8 plug.

- Steve

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04-07-2010 09:53 AM  8 years agoPost 8
DS 8717

rrProfessor

Here wishing i was somewhere else

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I am to new to nitro but the way I was shown by Bobby Watts and Henry Caldwell was to set the high first by doing tic tocs rainbows or very fast circuits bring then bring the heli in check temp and continue this procedure till temp gets to approx 200 degrees, then start adjusting the mid by doing full collective punchouts till engine sounds happy. I reccomend watching the smack talk video on engine tuning it worked for me.
The only problem with setting the highend first is the mid needle also chages the high end setting,so if you lean the mid range it also leans the high end so you have to readjust the high end again.they are adjusting the needles on a YS like an OS but you cant because they set differently.Read your instructions it tells you that. You need to set the mid needle first then set the highend. I leave the gov on on mine to break it in,i just lower the headspeed some to break it in.

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

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04-07-2010 11:53 AM  8 years agoPost 9
Chuckie

rrKey Veteran

Crofton Maryland

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Your right James, my bad. It's been a while since I ran my 56.

Please stand by for faster service!

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04-07-2010 05:33 PM  8 years agoPost 10
James3922

rrApprentice

Scotland

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No worries Chuckie.

I run my first tank rich enough for unburnt fuel / oil to come from the exhaust - At first at a high idle but opening the throttle up more and for longer letting it settle back down in between. During this I wont go above 1/3 throttle.
After that I find it easiest to use the gov and hover at the lowest HS the heli will allow.
My 56 is in a Vibe 50 and I hovered three tanks at 1600HS gently pitching up and down leaning a couple of clicks at a time, producing lots of smoke.
After that I started leaning for performance at 1750, 1800 then 1850, with 2 or 3 adjustments per tank flown. Any engine has to be at running temp before you can tune.
I only did it so carefully and slowly cause my tuning skills are not that great and I have no previous experience of YS.
You will probably hear differing opinions on break-in procedure, I suggest you follow those with the most experience.

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04-07-2010 06:18 PM  8 years agoPost 11
hootowl

rrProfessor

Garnet Valley, Pa.

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I believe this to be correct and rarely mentioned..

Mechanically there are small ports in the carb the get exposed/covered as the carb drum rotates. At idle the idle port is exposed. At hover that port is exposed. At high that one is exposed. The transition is when you are passing from one port to the other, sometimes both being open at the same time.

Is this correct?

Wolves don't lose sleep over the opinions of sheep

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04-07-2010 06:51 PM  8 years agoPost 12
DS 8717

rrProfessor

Here wishing i was somewhere else

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The midrange port is open from about 1/4 opening to wide open,the high end port is open from about 3/4 to wide open.The idle needle has no effect on the mid or high needles.the high needle has no effect on hover.

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

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