rubenjrf

I have a great planes Reactor 3D arf 58" with a OS 55 AX the engine is almost inverted (as the manual shows) it start easely but when you try to tune it feels like a 40 engine (don't sounds like a powerful 55 AX) and when you touch the fuel neddle one click it gets too lean or too reach depending if closing or opening, i try with a tach and it is 2000 rpm below some other 55 AX in the up right position, i'm using 15% omega (Morgan Fuel), 11X7.5 APC prop, # 8 OS glow plug the idle is fine

Thanks
Ruben,J.R.
Venezuela, South America

Bozarth

My Feedback: (15)

Where is the tank in reference to the carb?

Kurt

rubenjrf

the tank is located as the manual, maybe a little higher than the carb because of the inverted engine

motoman11

My Feedback: (3)

Make sure you dont have a air leak around carb ot back of motor also check head screws see that they are tite is it a new motor has it ben broke in right?

DGrant

My Feedback: (4)

Yeah... it sounds like something mechanical or plumbing. That engine should run like a swiss-watch... even inverted. Check for kinks, or bends in the fuel line, and as someone mentioned the dreaded air-leak... Make sure you're carb is seated on the engine snuggly and that O-ring is perfect... Make sure there's no obstruction in the line or inlet to the engine.. I do believe that to be a "remote needle" set up.. I've been suspicious of the fittings and knuckle set up those use from day one... they seem like just one more turn/curve the fuel has to take before it hits the engine.... its usually the first place I'd look.. So...

Tuning an inverted engine can be somewhat sensitive.. but what you're describing sounds way out of any normal tuning.. there's a problem. Haha.. you knew that though.. I hope you get it worked out soon. Good luck.

jaka

Hi!
The center of the tank must not be above the carb intake orifice when plane sits horizontal!
That's the tank mounting rule...and must obeyed if you want to have good running engine.