Improved Flywheel for Ski-Doo Expedition GSX GTX MX Z 600 800 HO SDI | Lynx 600 GT 2003-2010 | 420866040 420866041Don't Repair. Replace like a pro! New Heavy Duty Flywheel Rotor Ski Doo + Lynx Snowmobile Introducing our newest Heavy Duty Flywheel Rotor For Ski Doo + Lynx Snowmobiles. Anyone who rides or repairs Ski Doo + Lynx Snowmobiles 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