i really can't help with the Maxi .. i know nothing about it.. but lots of people here own them. Hang on for other people to contribute.
You should be able to hear and feel a bike shift, often accompanied by some shuddering of the 2nd gear clutch. Acceleration off the line should be good on a flat road if it's actually in 1st gear.
I knw of no easy way to adjust shift point. It depends on a centrifugal clutch who's characteristics depend on the strength of it's internal springs. These springs are sometimes replaced to tailor performance, and springs of different strengths are offered for sale.