I think that my moped is running rich. When I take off the air box (not the filter) on my carb, I get about 5-6 mph higher top speed. I tried cleaning the carb thoroughly, and I'm jetted at only #48, so what might be causing this problem? I already know that the bike has low compression, could that have something to do with what I'm seeing here?
Also, until I can fix the problem, is it ok to ride without my airbox on? I still have the air filter in, just not the box.
P.S. If it makes a differece, my engine is a Franco Morini M01 with a 14/12 Dellorto carb.