I have a 3MM 53, it's my first gas engine. It starts easy, runs up smoothly, and idles well. When I try to throttle up from idle to wfo quickly, it'll cut out and die. If I catch it quickly enough and drop the throttle, the engine will pick back up. I don't have a manual as I bought it from a friend. Am I too rich or too lean? It's dark now and I can't experiment till the weekend...maybe one of you can help me save some time and do it right the first time.

You may need to richen up the high end a bit, but I think that the engine is needing a few hours of run time to seat the ring. On all my new gas engines I use throttle management until they are broke in, which means moving the throttle stick slowly when throttling up the engine. Throttle management is the key.

Richen the low end about a 1/16 until it will transition correctly.

Cobra1 is on point as the low end feeds the high also . Set the high for max RPM and then maybe out one screw driver blade. MOve the low screw needle in screw driver blade moves, do not move it a lot a one time as a little goes a long long way.....Once the low transition well go back and double check the high as it may need one more screwdriver blade adjustment depending on u did to the low end.....

Cobra1 is right on, sounds to me like low end in lean.

post 3, 4, and 5 are right on

Those guys seem to be right on the money, but just one thing to remember, do all your carb adjustments after the engine has been allowed to warm up for a few minutes, as trying to tune a cold engine is an exercise in futility.

Karol

All previous posts are correct. I had the same problem with the engine dying when gunning the throttle. The low end was way to lean.
Be patient, If you cant get to the needles while it is running you may need to restart 5 or 10 times. It will be worth it.

You can go to Dawghouser/c.net and enter forums. Go to 53cc engine section and find the carb adjusting information I posted. I found it on Here and it will help you understand what is going on in the gas engine/carb area.