Improved Flywheel for Kawasaki Ninja 400 500 EX500 EX400 / Vulcan 454 500 LTD EN400 EN500 1985-1996Don't Repair. Replace like a pro! New Heavy Duty Flywheel Rotor Kawasaki Motorcycle Introducing our newest Heavy Duty Flywheel Rotor For Kawasaki Motorcycles. Anyone who rides or repairs Kawasaki Motorcycles is probably familiar with the flywheel problems common to these models. Most of these machines will have at least one flywheel failure in their lifetime so far. Low quality epoxy was used on OEM flywheels to secure the magnets to the rotor body.