ORIGINAL: pejuve
I just start with the break-in, the manual say open the HN 1 3/4, but is too rich, I'm playing with the needles but I can not reach a fine tunning, I'm using A8 glow plug and 12x6 apc prop. When I take off the glow driver, the rpm get down even it shut off, at full throttle it sound like it was lean but it does not, I'm confuse...
Twice in the last 3 years I've seen bad fuel act that way. One was Powermaster 10 or 15%, the more recent was CoolPower 10%. Fresh from hobby store, best needle adjustment at part throttle to start with, pull the glow driver and at idle the engine dies. Fiddle around, get full throttle, and the best one can do with the needle renders an intermittent miss that resembles lean misfire.
You might have a fellow club member spot you a tank of fuel, for troubleshooting purposes, from a known good jug of fuel. In any event, an experienced RC'er might be able to spot something you've overlooked.
Good luck,
Dave Olson
Later : edited for tpyos