I,m getting my engine to start, idle & run at half throttle, when at full throttle she quits. I have my hi needle 2 1/4 turns open low needle 1 3/4 open..... from what I,ve read my low end might be rich. I,v tried closing a little at a time. when I do this, do I nead to lean the hi also

dave de,

What engine do you have? Tweak your "H" needle for max rpm and then richen it about a 1/16 of a turn. Start leaning the "L" needle until you loose a good tranistion and then richen it a little. Go back to you "H" needle and repeat.

hey, thanks for the reply....I have the 3mm t0c-53 It was running fine then all a sudden this. I,ve been fooling with the needles all day long

Check the internal carb screen for debris....2-1/2 turns out on the high end seems like a LOT for any gasser. After inspecting and cleaning the screen, tune as Zippy described and report back.

If the internal carb screen is clean, then check the regulator diaphragm. If it is in the least bit stiff, it needs replaced. If you have a filtered clunk in the fuel tank, you should check that for cleanliness as well.

AV8TOR

could the regulator diaphram be bad when the engine is really still in break-in mode........is that the same as the float diaphram

dave de,

Check all the simple things like the filter in the carb, inline fuel filter which is a much, and is you battery fully charged. Sounds like you just need to tweak on the needles. If it is still a new engine everything else should be ok. I said should. Where your needle are currently is a good starting point but you need to tune the engine properly.