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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › OS 50 needle settings
12-07-2004 05:15 AM  13 years agoPost 1
Flyinrazrback

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Fort Smith, AR

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I have an OS 50 (non hyper) with a MPII pipe, running powermaster 30% fuel. Where does everyone have their top needle set? I was just checking mine and it was only 3/4 turn out, and would guess it needs to be 1.5-2 or so, what do you guys run on yours?

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12-07-2004 11:51 PM  13 years agoPost 2
Flyinrazrback

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Fort Smith, AR

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Nobody knows?

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12-08-2004 12:23 AM  13 years agoPost 3
cwright

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Blossvale New York

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Mine is set at 1 1/4 turns open. I fly in NY at about 500 ft above sea level. It will vary on a lot of things but that might be a good place to start. I have no overheating problems and more power than I need. I don't have the MPII but a Maverick muffler, so that might make a little difference also. Chuck

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12-08-2004 01:44 AM  13 years agoPost 4
tailrotordave

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Burbank, Ca

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This subject has so many variables but here's mine.

700ft msl. 50-60degrees ambient.
Raptor 50 with OS50 non hyper. MP2 Loud with Magnum 30%. Enya #3 plug. Did the Cateye mod a long time ago.
Main need is 3/4-7/8 turn.
Idle mixture is 80% to the lean side.
GV-1 and headspeed is 1930rpm

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12-08-2004 02:45 AM  13 years agoPost 5
Flyinrazrback

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Fort Smith, AR

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Thanks for the info, I was concerned that mine might be too lean only being 3/4 turn out, but will set it at 1 to start with just to be sure.

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12-08-2004 03:44 AM  13 years agoPost 6
rcheliflyer

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calif., usa

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The muffler does make a difference,
I had mine at 1 1/4 with the stock muffler, then at 1 1/2 plus with
a 60 size Hatori.
When I asked Curtis at a fun fly about the MP2, he mentioned it would
need to be a bit richer than the stock TT muffler, but I have not tried one.
How does yours run, does it show any signs of getting hot or leaning
out ?
The first thing mine does when it gets a bit lean is keep revving a bit
when I shoot an auto after flying, also the idle is too high after landing.
Also check the enging temp by touch or thermometer if you have one.
I tend to set mine rich so towards the end of the tank when the motor's
hot and the fuels getting lo, the mix is still ok.
Al says "when in doubt leave it out "

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12-08-2004 03:55 AM  13 years agoPost 7
Flyinrazrback

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Fort Smith, AR

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I havent temped it, but will. The last time I flew, when I went to full power and full collective out of a hover it just didnt have any power and came back to the deck, guessing that it would possibly be lean. Bottom end and transition is ok, just the top had no power.

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12-08-2004 04:24 AM  13 years agoPost 8
rcheliflyer

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calif., usa

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out of a hover it just didnt have any power and came back to the deck, guessing that it would possibly be lean
It could be lean, especially if the smoke thins out.
Try the same thing a little slower and see if the smoke thins out relative to the hover, it should thin out only slightly if at all .
Also before you go too far maybe put a fresh plug in it , take a good look at the old one for signs of heat, crystalized coil etc.

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