I just bought this and broke it in....All went smooth but about the 6th tank it started coughing, choking on accel and randomly stalling. I replaced the plug and proceeded thru about 6 more tanks of tuning. I got the needle as far out as over 6 turns at one point! Ive also changed plugs twice, checked piston and sleeve for damage (ok), and went back to factory setings (4 on hsn) several times. Im running traxxas 20% and not looking for an amazing racer or basher (nitro helis for that!), just a reliable running ground vehicle. I havnt touched the low needle just yet either. Any help would be appreciated, Tim

Lean your idle screw, or richen your lsn 1/8th of a turn, if the lsn makes it worse, then lean it 1/4th of a turn.

did u break in the engine right? When I got my 2.5 I did everything the DVD told me to do and I have had zero problems.

take the fuel lines off and check to see if the fuel tank, lines, or carburator is plugged up with and plastic peices.
when they are building them sometimes when they thread the tanks they laeve plastic in the bottom, and it causes tuning problems from
fuel starvation. good luck.

it sounds too rich