Improved Capped Magneto Flywheel for Polaris Ranger 800 6x6 | RZR 4 800 | Sportsman 800 Forest EFI 2012-2017 | 4013968Don't Repair. Replace like a pro! New Heavy Duty Flywheel Rotor Polaris 800cc ATV UTV Introducing our newest Heavy Duty Flywheel Rotor For Polaris 800cc ATV UTVs. Anyone who rides or repairs Polaris 800cc ATV UTVs 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