i bought a 27 tooth speed sproket for my tomos ped today and my friend noticed how heavy it was and suggested that we drill holls in it or cut out parts of it to lighten it and make it spin up to higher RPMS faster, this is the same friend who tried to start my moped when it wasnt fully put togather and chiped my piston. i figured i should ask befor i go a drill a bunch of holes in it and mess the thing up