i helped install a vespa motor into a kinetic years ago, we used the kinetic's cdi and the vespa's flywheel and it ran great. i know seth tried using the vespa flywheel and it didn't work out for him.. perhaps there are differences in years or something.
some kinetics have a steel flywheel with a plastic fan. the one we used a vespa flywheel on had that style. it is where i got the plastic fan for my ktm cdi used on ciaociao.