900W Magneto Flywheel Rotor for Polaris Ranger 1000 Crew / RZR 900 XP 4 / RZR PRO XP 4 2018-2025 | OEM# 4017135Don't Repair. Replace like a pro! New Heavy Duty Flywheel Rotor Polaris UTV Introducing our newest Heavy Duty Flywheel Rotor For Polaris UTVs. Anyone who rides or repairs Polaris 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 body. Over time and many heat