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Most, if not all, RC fuel systems have a self leaning tendancy.

That is why tuning is so important.

And I'll leave it at that.
 
The only engine(s) that don't lean out (with any type of fuel system) are YS engines. Too bad they don't make car engines.:violin: I had a .91 AC in a pattern plane, the fuel tank was a good 12-15 inches from the engine and it was consistant from full to empty, every time (even pointed strait up). They use a trick pressurized fuel system with a timed fuel "injection/metering" carb.
 

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