K&N High Flow Air Filter - HD-1390 Replacement — Harley-Davidson Softail Heritage Classic, Softail Fat Boy, Softail Custom (1990-1999)

K&N HD-1390 high-flow air filter for V-twin motorcycles, featuring pleated cotton-gauze media that increases airflow while maintaining excellent filtration. Washable and reusable with pre-oiling included, direct-fit into OEM airbox without fuel management tuning required.

Features

• Pleated cotton-gauze media for large filtration area
• Washable and reusable design
• Pre-oiled and ready to install
• Direct fit into OEM airbox with application-specific sealing bead
• Long service intervals between cleanings
• Made in the USA

Specifications

• Brand: K&N
• Manufacturer Part #: HD-1390
• UPC: 024844023353
• Length: 8.5 in
• Width: 8.5 in
• Height: 3.62 in
• Weight: 1.1 lbs

Fitment

Fits V-twin motorcycles including Harley-Davidson and Indian Motorcycle models. Verify dimensions and sealing bead compatibility with your specific bike before ordering.

Frequently Asked Questions

Do I need to retune my bike with this filter?

No — fuel management modifications are not normally required. The filter bolts into the stock airbox without tuning.

How often do I clean this filter?

Service intervals depend on riding conditions. Inspect regularly and clean when visibly dirty using K&N's filter service kit.

Is it pre-oiled out of the box?

Yes — the filter comes pre-oiled and ready to install. No additional prep needed.

Can I wash and reuse this filter?

Yes — K&N filters are designed to be cleaned, re-oiled, and reused for years of service.