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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › YS 61 ST-2 " Inconstant runs"
01-16-2009 02:54 AM  9 years agoPost 1
HeliHobNobbing

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cleburne tx johnson

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I has wondering if anyone has run into this problem before.I have a YS 61 that won't run at a steady rpm.I will come into a hover runing at about 1700 head spead,then it will climb to 1850 or higher,and then it might go down to 1500.I have change out the fuel lines,changed the carb,put a new pump diaphragm,cleaned the carb.All the needle valve setting are right.It holds good pressure in the lines.The only thing that I haven't change out is the check valve,ane it is put in line in the right way.Anyone have any suggestions?

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01-16-2009 03:44 AM  9 years agoPost 2
RaptorMan23

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Sioux City, IA

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How do you know all of the needle settings are right?

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01-16-2009 04:22 AM  9 years agoPost 3
HeliHobNobbing

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cleburne tx johnson

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Thats easy,I have the manual.

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01-16-2009 04:30 AM  9 years agoPost 4
RaptorMan23

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Sioux City, IA

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lol, the manual just gives you a place to start, if its at the factory settings then your way rich. That explains your problem

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01-16-2009 04:39 AM  9 years agoPost 5
HeliHobNobbing

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cleburne tx johnson

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If it is rich ,why would it lean out ,and the head spead jumpup to over 1800.

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01-16-2009 04:48 AM  9 years agoPost 6
RaptorMan23

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Sioux City, IA

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you can get 1800 on a rich engine. Usually when an engine is bloody rich they always run very inconcistent. Your problem is most likely the low speed being to rich which in turn isnt letting the high speed do its job. Believe me Ive seen it many times. Did this just start happening or is has it always done it?

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01-18-2009 12:41 AM  9 years agoPost 7
heliaddict1212

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Keller, Tx

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This is why I went os. I had 2 ys 61 engines that ran like crap no matter what I did so I got to the point I could care less anymore and ditched em. I dont think ys engines are bad I just think theyre WAYY too complicated. The only thing you didnt mention is gaskets but I assume you probably tried that already too. The gaskets are horrible and everytime I took apart my ys's I needed to replace them. Also check your needle o-rings I had more than one problem with those too.
Good luck.

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01-18-2009 01:12 AM  9 years agoPost 8
HeliHobNobbing

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cleburne tx johnson

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Hi ,Yes I have had this problem from the get go.No I did'nt replace the gasket when I took the carb apart they looked ok,and the orings,was what I was going to try next.Raptor man I might try what you said on the low speed settings ,right now I'm will to try any suggestions.This is driving me to my witts end.

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01-18-2009 02:53 PM  9 years agoPost 9
airdodger

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Johnston USA

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Give us some info, fuel, muffler, plug, gear ratio, new engine, just rebuilt, has it been sitting unused. My crystal ball is not working. It could be as simple as fuel with moisture a bad plug, an air leak or anything else, we need to narrow the causes down.

Chris

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01-19-2009 04:51 AM  9 years agoPost 10
HeliHobNobbing

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cleburne tx johnson

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I'v allways run wild cat fuel,and it is a fresh,it is a standard raptor 60,the ys I got used,been setting for awhile,but has veary little time on it.The plug is a new enya #3,and like I said before I change all the fuel lines,in the tank too,and it holds good presure.

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01-19-2009 03:12 PM  9 years agoPost 11
airdodger

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Johnston USA

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My guess would be look at the rear bearing for rust , next the regulator.

Chris

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