both of my bikes can take off just by using the clutch and no peddling.
one bike is a 66 cc 2 stroke with a 41 tooth rear sprocket and the other is a 49 cc 2 stroke also weith a 41 tooth rear sprocket.
the big difference is that my bikes are 20" frames with 20" wheels.
one bike has a 21 inch tall rear tire, and the other has a 24" tall rear tire.
I can take off with both bikes by feathering the clutch slightly just like a motorcycle, and i am getting around 25-28 mph top speeds.
i'm a little guy tho...5'6", 155 lbs.
definitly do not try to pop the clutch and do a burnout or a wheelie...there just isn't enough gear ratio there, and it's very hard on the spokes.
you can, however. hold the bike back with your feet and gently lift up on the seat with your inner theighs to take some of the friction away from the rear tire and the ground, and do smokey burnouts....lol