Stator + Kokusan Flywheel + MOSFET + Puller (RMS900-103810)Introducing our newest heavy duty recall type charging system upgrade kit for Aprilia 2009 2020 RSV4 & 2011 2020 Tuono V4. Anyone who rides or repairs Aprilias motorcycles is probably familiar with the stator, flywheel, and sometimes voltage regulator issues common to these models. Most of these bikes will have had at least one stator fail in their lifetime so far. The main problem was extremely strong magnets were used on the original flywheels,