mine did not run well on the rich side of the limiter range, and I flew mine on the leanest setting with the limiter on for at least 5 flights after that I had a minor crash and lost the little plastic thingy,I had to lean the engine out anyway to get it to run better, so it didn't matter.

I have retired the old NEXTAR and am planning to use the engine on another plane the 46 is a great little engine and will give you many years of great running as long as you take care of it, of course read all the manuals, the engine booklet should have come in the box with the instructions, it will help alot with understanding your engine and how it works.

as well, bruce hit it on the head check all nuts bolts and screws they might, or might not, be tight and "ready to fly" you will have to loosen and remove some things, muffler,remote needle valve, to get at the hidden screws and bolts they need to be secure for sure, and make sure your landing gear are fully snapped in, give em a good tug to make sure they won't slip out if they do then clear the holes in the gear of paint or any obstruction with a small round file or sand paper so they do "snap in" quite a few have fallen out in mid air because they were not checked before flight. once you have checked out your plane and deemed it air worthy you will be pleasantly surprised how well it flys.