Never heard of a mitsubishi 49cc two stroke... Until very recently, the largest one they made was the TLE43 (43cc.) They just came out with the TLE48 (a 48 cc motor.)
Nor, does the mitsubishi carb even HAVE a mixture screw. There's only an idle adjust screw.
If it's a genuine mitsubishi, it will have a 'two-barrel' carb. One of the 'barrels' is used to send air (only) to the cylinder for a short time, to reduce emissions.
If it's a true mitsubishi, you should be running at 50:1 on the premix.
Every single person has told me exactly that. But this is the EXACT motor
Code:
http://thescooterguy.org/cgi-bin/i/images/motors_001.jpg
My carb has idle adjust, and mixture adjust... the guy i bought it from (not Jerry) said run it at 30:1