I have a LMH 110 with the .061 in it. I have a 4 grip and a 6 grip and am running 3 head gaskets with 15% fuel. I am running at sea level and have not had any problems with the heli, I would fly 4 or 5 tanks at one session. Now, I am having troubles getting it to run for 2 minutes. If I lean it out with enough power to fly, it overheats. If I richen it up enough to stay cool, it won't leave the ground. It runs great for a minute or so and then begins to lose power. The ambiant temps lately have been high 80's low 90's
Any suggestions?

Sounds like you have to flush your fuel system. You may have something restricting your fuel though it may be microscopic. That happens to me and everytime i flush my lines, things go back to being ok. Another thing also could be is that your plug may be getting worn which means you will have to lean it out more but not getting sufficient amount of fuel which will cause an overheating condition.

Ditto on the glow plug and fuel line flush.

Take the glow plug off and hook it up to your battery. It should glow a very hot yellow with no crushed wires or touching coils. Sometimes a careful separation of bent wires will help things out. If it can not be saved, stock up on a few more from your LHS. I have found a bad plug to almost always be the cause of my problems similar to what you have described.

Take the needle out of the carb and the fuel line off the tank. Flush fuel backwards through the whole works. While you have the needle out, make sure there are no marks or grooves in it. If the needle has been over tightened, the resulting ring or step in the needle makes it almost impossible to adjust properly. If the needle is damaged, throw it out and get a new one. Just be careful not to over tighten and you should never have to buy a second needle. Trying to use a grooved one is about the most frustration you can have with a LMH.

Best of luck and let us know how it goes.

For what it is worth,

Spiro

Ditto to what Darth and spiro say, also check your line for air leaks, and check to make sure the back cover is sealing,I tried to fix a grooved needle, it don't work so don't waste yur time on that one!!!