You can use a 650 flywheel
http://www.x-h2o.com/threads/37809-...aki-amp-Yamaha-Lightened-Flywheels&highlight=please post the link he sent you, I need to get mine lightened this winter.
X2send the stocker to #zero and have it lightened?
Yesdont you need to convert electronics to 650 when doing this?