BMC FM321/21 washable motorcycle air filter for Polaris Magnum 500 4X4, Sportsman 335, Sportsman 600, Sportsman 500 6X6 Mv, Worker 335, Worker 500, Xpedition 325, Xpedition…
BMC FM321/21 washable motorcycle air filter for Polaris Magnum 500 4X4, Sportsman 335, Sportsman 600, Sportsman 500 6X6 Mv, Worker 335, Worker 500, Xpedition 325, Xpedition… - product view 2
BMC FM321/21 washable motorcycle air filter for Polaris Magnum 500 4X4, Sportsman 335, Sportsman 600, Sportsman 500 6X6 Mv, Worker 335, Worker 500, Xpedition 325, Xpedition… - product view 3
Genuine BMC Replacement Filter

BMC FM321/21 Air Filter - Polaris Magnum 500 4X4 & Sportsman 335

Sale price$53.90
Part No. FM321/21
Application Polaris Sportsman, Scrambler, Magnum & Worker families
Package Contents 1 Air Filter

Shipping calculated at checkout. 30-day returns on eligible items.

Fitment questions? Ask EPF before ordering.

GENUINE BMC WASHABLE REPLACEMENT AIR FILTER

BMC Air Filter FM321/21

The BMC FM321/21 is a washable, reusable cylindrical motorcycle air filter for Polaris Magnum 500 4X4, Sportsman 335, Sportsman 600, Sportsman 500 6X6 Mv, Worker 335, Worker 500, Xpedition 325, Xpedition 425, Xplorer 500 4X4, Magnum 325 2X4/4X4, Ranger 425 2X4, Scrambler 1000 Xp Eps/Xp/Xp S/Xp S Le, Scrambler 500 2X4/4X4, Scrambler 850/Xp Ho/Xp Ho Eps Le, Sportsman 1000 Xp/Touring Xp/Touring Xp Ltd, Sportsman 1000 Xp High Lifter Edition/Xp Hunter Edition/Xp Premium, Sportsman 1000 Xp S/Ride Command Edition/Xp Ultimate Trail/Touring Xp Trail, Sportsman 400 2X4/4X4/Ho/South Edition, Sportsman 450/Ho/Eps/Utility Edition, Sportsman 500 4X4/6X6/Ho/Duse/Rse, Sportsman 500 Mossy Oak/Efi/X2/Deluxe/Mv, Sportsman 500 Touring/Le/Forest/Forest Tractor, Sportsman 550/Eps/Browning Le/Touring/X2, Sportsman 550 Orange Madness Le/Forest, Sportsman 570/Eps/Touring/SP/Hunters Edition, Sportsman 570 Eps Utility Edition/Hunter Edition/Premium, Sportsman 570 Touring Premium/X2/Trail/Ultimate, Sportsman 570 Ultimate Trail Le/Utility Hd Le/Ride Command Ltd Ed., Sportsman 570 Utility Hd/Touring Ultimate/Premium 40TH Anniversary Ed., Sportsman 570 X2 Eps/Big Boss 6X6 Eps/6X6, Sportsman 700/Efi/Twin/Mossy Oak/Mv, Sportsman 700 MV7/Efi X2, Sportsman 800 Efi/Twin Efi/Deluxe/X2/Ho, Sportsman 800 Touring/Le/Military/Big Boss 6X6/Forest, Sportsman 850/SP/Touring Eps/Touring Ho Eps, Sportsman 850 Ho Touring Eps Sunset Red Le/Ho Touring Eps Bronze Mist Le, Sportsman 850 Touring SP/High Lifter Edition/Premium/Touring, Sportsman 850 Ultimate Trail/Trail, Trail Blazer 330, Trail Boss 330, Trail Boss 325 2X4. Confirm the exact listed model year and factory airbox before ordering.

OEM-Style Fitment

Designed to replace the factory air filter on compatible applications where BMC FM321/21 is specified.

Washable & Reusable

This BMC filter can be cleaned and re-oiled with the proper BMC cleaning kit instead of being discarded like a standard paper filter.

Performance Filtration

BMC’s oiled cotton gauze design supports improved airflow while maintaining filtration for performance-focused applications.

Vehicle Fitment

Application Guide for BMC FM321/21

Use the table below to help confirm whether this BMC air filter matches your vehicle, engine, and application.

Year Range Make Model Engine Trim / Notes BMC Part No. OEM Cross Reference
1999–2003 Polaris Magnum 500 4X4 Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
1999–2001 Polaris Sportsman 335 Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2003–2005 Polaris Sportsman 600 Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2007 Polaris Sportsman 500 6X6 Mv Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
1999 Polaris Worker 335 Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
1999 Polaris Worker 500 Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2000–2002 Polaris Xpedition 325 Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2000–2002 Polaris Xpedition 425 Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
1997 Polaris Xplorer 500 4X4 Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2000–2001 Polaris Magnum 325 2X4/4X4 Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2001 Polaris Ranger 425 2X4 Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2015–present Polaris Scrambler 1000 Xp Eps/Xp/Xp S/Xp S Le Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
1997–2012 Polaris Scrambler 500 2X4/4X4 Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2013–present Polaris Scrambler 850/Xp Ho/Xp Ho Eps Le Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2015–present Polaris Sportsman 1000 Xp/Touring Xp/Touring Xp Ltd Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2015–present Polaris Sportsman 1000 Xp High Lifter Edition/Xp Hunter Edition/Xp Premium Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2020–present Polaris Sportsman 1000 Xp S/Ride Command Edition/Xp Ultimate Trail/Touring Xp Trail Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2001–2014 Polaris Sportsman 400 2X4/4X4/Ho/South Edition Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2006–present Polaris Sportsman 450/Ho/Eps/Utility Edition Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
1996–2013 Polaris Sportsman 500 4X4/6X6/Ho/Duse/Rse Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
1996–2013 Polaris Sportsman 500 Mossy Oak/Efi/X2/Deluxe/Mv Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
1996–2013 Polaris Sportsman 500 Touring/Le/Forest/Forest Tractor Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2010–2014 Polaris Sportsman 550/Eps/Browning Le/Touring/X2 Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2012 Polaris Sportsman 550 Orange Madness Le/Forest Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2014–present Polaris Sportsman 570/Eps/Touring/SP/Hunters Edition Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2014–present Polaris Sportsman 570 Eps Utility Edition/Hunter Edition/Premium Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2014–present Polaris Sportsman 570 Touring Premium/X2/Trail/Ultimate Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2014–present Polaris Sportsman 570 Ultimate Trail Le/Utility Hd Le/Ride Command Ltd Ed. Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2014–present Polaris Sportsman 570 Utility Hd/Touring Ultimate/Premium 40TH Anniversary Ed. Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2014–present Polaris Sportsman 570 X2 Eps/Big Boss 6X6 Eps/6X6 Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2002–2008 Polaris Sportsman 700/Efi/Twin/Mossy Oak/Mv Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2005–2008 Polaris Sportsman 700 MV7/Efi X2 Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2005–2014 Polaris Sportsman 800 Efi/Twin Efi/Deluxe/X2/Ho Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2005–2014 Polaris Sportsman 800 Touring/Le/Military/Big Boss 6X6/Forest Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2010–present Polaris Sportsman 850/SP/Touring Eps/Touring Ho Eps Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2013–2014 Polaris Sportsman 850 Ho Touring Eps Sunset Red Le/Ho Touring Eps Bronze Mist Le Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2015–present Polaris Sportsman 850 Touring SP/High Lifter Edition/Premium/Touring Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2022–present Polaris Sportsman 850 Ultimate Trail/Trail Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2010–2013 Polaris Trail Blazer 330 Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2010–2013 Polaris Trail Boss 330 Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
2000–2001 Polaris Trail Boss 325 2X4 Model-specific motorcycle engine Confirm exact model year, market, and factory airbox FM321/21 POLARIS 1253144; 7080595; 7082101
Fitment note: This fitment table is based on BMC's published application data for FM321/21. Confirm the exact model, year, market, factory airbox, and OEM reference before ordering.

Product Specifications & Cross References

Platform Polaris ATV/UTV applications
Engine Notes Fits the listed model-specific motorcycle applications where BMC FM321/21 or POLARIS 1253144; 7080595; 7082101 is specified. BMC's catalog does not provide a separate engine-code field, so confirm exact model and year.
BMC Part Number FM321/21
Filter Type Cylindrical
Filter Dimensions 63 × 98 × 209 mm
GTIN / EAN 8032872866998
Package Contents 1 Air Filter
OEM Cross References POLARIS 1253144; 7080595; 7082101

Why Choose BMC?

BMC replacement filters are built for drivers and riders who want reusable performance filtration while keeping an OEM-style airbox fitment.

The FM321/21 is designed for compatible applications where this BMC part number is specified. It is a smart choice for enthusiasts, shops, and installers looking for a washable replacement filter without converting to a full intake system.

Cleaning & Maintenance

BMC filters are washable and reusable when serviced correctly. Use the proper BMC cleaning kit, allow the filter to dry fully, and avoid over-oiling before reinstalling it.

Shop BMC Cleaning Kit Read Cleaning Guide Installation Guide
Fitment Support

Not Sure This Is the Correct BMC Filter?

Contact European Performance Filters before ordering. We can help verify the correct BMC part number using your vehicle details, model, engine, and production information.

Contact EPF for Fitment Help Shop Motorcycle BMC Filters
Product FAQ

BMC FM321/21 FAQ

Is BMC FM321/21 a direct replacement filter?

Yes. BMC FM321/21 is designed as an OEM-style replacement filter for compatible applications where this BMC part number is specified.

Does this BMC filter require tuning?

No tuning is typically required when BMC FM321/21 is installed as a direct replacement in the correct factory airbox. A motorcycle with additional intake, exhaust, fueling, or engine modifications should be evaluated as a complete setup.

Can this BMC filter be cleaned and reused?

BMC FM321/21 is washable and reusable. Service the filter with the proper BMC cleaning and re-oiling kit, allow it to dry fully before oiling, and avoid over-oiling before reinstallation.

How do I confirm this filter fits my vehicle?

BMC FM321/21 fits the applications listed in the fitment table. Match the exact model and year, then confirm the factory airbox and OEM reference POLARIS 1253144; 7080595; 7082101.