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Home › RC & Power › ✈️Aircraft › 🚁Helicopter › Engines Plugs Mufflers Fuel › symptoms of a burnt ring or piston?
05-22-2007 03:35 AM  13 years ago
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jjoos99

rrApprentice

Yellow Springs Ohio USA

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symptoms of a burnt ring or piston?
I have an os 46 that I got used off rr a couple of years ago. Last year I had it die in flight and crashed landed. After rebuilding the heli I havent been able to get the engine to run right since. It will smoke alot at first and will spit and sputter at midrange just before lift off, but then clears up and will not smoke near as bad. But it will then take on a spell of dieing and then very hard to restart. Could this engine have burnt a ring last year? I have been pulling my hair out trying to get it to run right. I am also having to almost lean it out to 3/4 of a turn out to run somewhat right.

any ideas are appreciated
Jeff
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05-22-2007 03:37 AM  13 years ago
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Divot

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Mesa, AZ

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This sound like a rich low end with a lean high speed needle.
The restart problem is because the engine has overheated.
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05-22-2007 05:50 AM  13 years ago
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Gearhead

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Vt

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""This sound like a rich low end with a lean high speed needle"",, I agree with Divot,, if your low end was lean it should bog or hesitate or even stall without sputtering,,

remove your muffler and look in at the piston, if the piston is dark brown then it has been run lean, if there is scoring on the piston then you have a wose problem,, if the piston is very dark brown you could have a stuck ring, meaning the ring will not move in it's groove, this will stop the ring from sealing once the motor/liner comes up to operating temperature..

JimJim
Buzz Buzz Buzz
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05-23-2007 01:39 AM  13 years ago
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jjoos99

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Yellow Springs Ohio USA

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What would be a good starting point for the low end. My booklet for the engine says to start with 2 turns out on the high side but doesnt mention the low side.
Thanks
Jeff
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05-23-2007 06:48 AM  13 years ago
0Post 5
Gearhead

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Vt

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there has been many post where guys said their idle screw is pointing about 1:00 O-clock, do a search on Hyper tuning..

JimJim
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