BMC FM639/12 v-twin motorcycle air filter for Rough Crafts & Joker Machine 4-Inch Air Cleaners
BMC FM639/12 v-twin motorcycle air filter for Rough Crafts & Joker Machine 4-Inch Air Cleaners - product view 2
BMC FM639/12 v-twin motorcycle air filter for Rough Crafts & Joker Machine 4-Inch Air Cleaners - product view 3
Special Order BMC Filter

BMC FM639/12 Air Filter - Rough Crafts & Joker Machine 4-Inch Air Cleaners

Part No. FM639/12
Application Rough Crafts & Joker Machine 4-Inch Air Cleaners
Order Type Inquiry Required

Request This BMC Filter

This BMC filter may be available by special order or fitment inquiry. Contact European Performance Filters to confirm fitment, availability, lead time, pricing, and ordering requirements before purchasing.

Status Special order / availability confirmation required
Lead Time Contact EPF for current lead time
Fitment Confirm before ordering
Request Special Order Help
Special order stipulations

Special-order items may require payment up front and are typically not cancelable or returnable once ordered from BMC. Lead times can vary by BMC availability, production status, and import timing. Contact EPF before ordering to confirm fitment, availability, lead time, pricing, and ordering requirements.

GENUINE BMC WASHABLE REPLACEMENT AIR FILTER

BMC Air Filter FM639/12

The BMC FM639/12 is a washable, reusable replacement filter for Rough Crafts & Joker Machine 4-Inch Air Cleaners. This special-order component is dimension-matched rather than a guaranteed vehicle-specific replacement; confirm 61 × 99 × 51 mm and all mounting clearances before ordering.

OEM-Style Fitment

Designed to replace the factory air filter on compatible applications where BMC FM639/12 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 FM639/12

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
Universal Harley-Davidson Round Replacement Filter For Rough Crafts, Joker Machine And Other 4-Inch Air Cleaners Dimension-matched air-cleaner application: 61 × 99 × 51 mm Component fitment; confirm every published dimension, mounting surface, and available clearance FM639/12 No direct OEM cross-reference published by BMC
Fitment note: BMC publishes FM639/12 for the listed aftermarket air-cleaner application. Confirm 61 × 99 × 51 mm, the air-cleaner model, mounting surface, and clearance before ordering.

Product Specifications & Cross References

Platform Harley-Davidson motorcycle applications
Engine Notes This is a dimension-matched aftermarket air-cleaner filter. No vehicle fitment is guaranteed; confirm 61 × 99 × 51 mm and the complete installation requirements.
BMC Part Number FM639/12
Filter Type V-Twin
Filter Dimensions 61 × 99 × 51 mm
GTIN / EAN 8055732591953
Package Contents 1 Air Filter
OEM Cross References No direct OEM cross-reference published by BMC

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 FM639/12 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 FM639/12 FAQ

Is BMC FM639/12 a direct replacement filter?

Yes. BMC FM639/12 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 FM639/12 is installed as a direct replacement in the correct air-cleaner assembly. 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 FM639/12 is washable and reusable. Service it 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 FM639/12 is designed for Rough Crafts & Joker Machine 4-Inch Air Cleaners, but fitment is dimension- and component-specific rather than guaranteed by motorcycle model. Confirm 61 × 99 × 51 mm before ordering.