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HomeAircraftHelicopterMain Discussion › Engine kicks backwards at idle
02-07-2006 02:15 AM  12 years agoPost 1
LoganAZ

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Phoenix. Arizona, USA

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If I get to a low idle which i should be at my engine will kick backwards and turn the wrong way... most ppl have told me im too rich on low end... ive tried leaning it all the way out and it still did it...any ideas ?

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02-07-2006 02:20 AM  12 years agoPost 2
GURUMODS

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Poughkeepsie,New York

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Raise your idle slightly

Hooters in gallery

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02-07-2006 02:24 AM  12 years agoPost 3
LoganAZ

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Phoenix. Arizona, USA

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thats what im doing right now but i shouldnt have to... and its not really slightly its quite a bit to keep it from kicking...this scares me because if i ever do an auto and need to bail out of it what if my engine kicked backwards...or will it not kick if your blades are moving ?

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02-07-2006 02:28 AM  12 years agoPost 4
ant_mb

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United States

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had this happen a few times on an os 32. Turned out to be too rich, but you already tried that so I don't know.


Anthony

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02-07-2006 02:35 AM  12 years agoPost 5
rkeith2

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Norco, CA

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Is it a YS 91 by chance?


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02-07-2006 03:07 AM  12 years agoPost 6
BlakeMcBrayer

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Georgetown, Ky

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Ive tried leaning it all the way out
I'm assuming that when you are trying to leaning it, you are turning the low needle "in"?

Your statement that I have quoted sounds like you may be turning the low needle out to lean it. Turning out needles is usually richer and in is leaner.

.

Don't come off the throttle untill you see your GOD!

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02-07-2006 03:49 AM  12 years agoPost 7
LoganAZ

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Phoenix. Arizona, USA

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It is an os50... and i am screwing in the low end... clockwise...to lean it out that is... and i have tried both ways neither makes it stop kicking backwards

Do you think if i called OS they would be able to tell me how to fix it ?

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02-07-2006 10:50 PM  12 years agoPost 8
vavavoom

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London, England

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Does this happen only on initial start ups?.
In the UK recently the weather is about 0 celcius, on the first start of each tank of my os50sxh it very occasionally pops back and runs in reverse. This is a combination of cold and running a slightly rich idle setting. When the motor warms up a bit it clears and doesnt happen at any other times in flight including during autos etc.

## Inteligence is knowing a tomato is a fruit...Common sense is not putting it in a fruit salad

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02-07-2006 11:38 PM  12 years agoPost 9
BlakeMcBrayer

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Georgetown, Ky

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LoganAZ

I figured you had it right, I just wanted to ask, since your wording wasn't totally clear.

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Don't come off the throttle untill you see your GOD!

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02-07-2006 11:51 PM  12 years agoPost 10
montarok

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Brooklyn, NY

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A friend of mine has the same problem and we couldn't figure out what the cause is. We later learned that the OS .50 engines have that problem a lot.

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02-08-2006 12:22 AM  12 years agoPost 11
LoganAZ

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Phoenix. Arizona, USA

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well i havent fixed the problem but i have adapted to it... when it kicks backwards i just put my fingure on the thing that u stick starter on and if you slow it enough it will kick the engine back to normal ... if anyone didnt know when engine is running reversed that little thing u put starter in spins even if u touch it... but if you put enough pressure on it with your fingure u can stop it and it will kick engine back to normal... figured its better doing that then having to cut engine and restart it

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02-08-2006 12:31 AM  12 years agoPost 12
ctd - Mike (RIP)

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Mile High, USA

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Does it
Does it make any RPM difference when you turn the screw in or out? If not you have a vaccume leak....had this problem with a plane a few years back.

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02-08-2006 12:36 AM  12 years agoPost 13
LoganAZ

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Phoenix. Arizona, USA

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yes it does cdt...

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02-08-2006 03:26 AM  12 years agoPost 14
Thomas L Erb

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Alliance ohio

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Logan is your clutch dragging a little by chance this can contribute to the problem the engine may have.This is for the same reason that your engone will reverse when you grab the start shaft. just a thought Tom

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02-08-2006 03:29 AM  12 years agoPost 15
FlynHeli

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Las Vegas, NV

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we just had that problem and it was the clutch that was bad.


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Money conquers patience, If you have money you don't have to wait!

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02-08-2006 04:08 AM  12 years agoPost 16
s80mac (RIP)

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San Diego

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If you have a lot of drag on the clutch or a bent start shaft it can cause this, has the heli been chrashed recently?

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02-08-2006 04:16 AM  12 years agoPost 17
LoganAZ

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Phoenix. Arizona, USA

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nope never crashed... and that chickenx5 guy is a little imature kid thats an idiot...so dont bother reading his posts...

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02-08-2006 04:36 AM  12 years agoPost 18
airdodger

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Johnston USA

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The only other item I can think of would be to try another head shim. Chris

Chris

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02-08-2006 05:56 AM  12 years agoPost 19
Rcer22

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Somewhere In The Adirondack Mountains

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I have to go along with the clutch idea. Iv'e seen this before. Some times the clutch opens too much and is now too wide to close all the way. The result is the clearance between the clutch and drum are too tight and it will drag slightly. That can cause your problem.
One way to check is see how hard your blades want to turn at idle.
At low idle they should be able to stop or at least turn very slow and be able to be stopped easily.

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