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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › O.S. .61sxh-wc leaning at half tank
12-08-2015 09:02 PM  33 months agoPost 1
mccoy

rrNovice

parlin,N.J. USA

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When I get to half tank it starts to lean.Up until that point it runs fine, any help please

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12-08-2015 10:45 PM  33 months agoPost 2
don s

rrElite Veteran

Chesapeake, VA

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Sounds like a hole in the fuel tubing inside the tank. Leans out when the fuel level goes below the level of the hole, which starts sucking air.

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

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12-11-2015 06:31 PM  33 months agoPost 3
Ghia

rrApprentice

Abq, NM

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Im old school and I uniflow every nitro heli/plane I own. Half tank lean issues are gone.

it actually richens the tune when fuel level gets down into the header tank. It stays very consistant tune while fuel is in the main tank. Here is a great read about uniflow tanks. Any questions I can help you if interested

http://www.fraserker.com/heli/unifl...iflow_works.htm

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12-16-2015 07:00 AM  33 months agoPost 4
Dr.Ben

rrMaster

Richmond, VA, USA

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It's either what Don said or you're too lean to start which then makes it excessively lean by midtank (the reason pressure regulated engines are popular). Check the whole fuel system and then either tune it richer so it's not lean by mid to low tank or do the uniflow mod which does work extremely well.

Ben Minor

PS: The SX were somewhat prone to lean runs and were sensitive to fuel level and tune in part due to their relatively large choke area compared to displacement.

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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