Centrifugal clutch. Buy it. At that price it's a steal. You wuld be hard pressed to find a cruiser at that price let alone one with a motor. Would attract less attention to a go ped. Kids keep asking if they will ever ride my go ped... Reply is a simple, NO. One of the reasons it's not in one piece right now. Going 25 mph on 6" tires someone always ends up loosing some skin.
That's what I was thinking. The motors alone are like $160-$225 plus shipping online.