Any idea what the throttle bore is? Most 60 size motors will have trouble with anything larger than 9mm without a pump.

If yours has the spray bar opening at the bottom of the carb I'd say that would be the correct postion. IMO I would say the replacementcarbs spraybar is misaligned and should also have the opening at the bottom as that would be the best position for max fuel draw.

I'm also thinking that there's a partial blockage of some sort between the fuel inlet of the carb and spraybar. I once had a carb that had a small blockage in that area that was doing the same thing. Took off the needle and seat and a piece of gummed up fuel was blocking the passage partially.

I just got my first plane going since I got back into the hobby and decided to usepumps this time around and Iam sold on the concept as the engine on my Utter Chaoshas positive pressure to the carb through all manuvers. I got about 40 flights with no dead stickswith the same glow plug. The one deadstick I did get was due to a small piece of aluminumI must of picked up of the runway as it lodged in the glow plug.
I completely broke down the engine and no aluminumin it was broke or chipped os must of came from the runway.

Regards.