Twin Air®

The OEM foam secondary filter can deteriorate rather quickly. Once that happens, it can allow enough dirt into the engine to do significant damage. Replace your filter now with a high-quality foam filter from industry leader Twin Air.

This filter needs to be oiled like any air filter to work properly.

Only for bikes with the stock BST40 carburetor!

Two layers of foam, catch and retain nearly any contamination you will encounter.

The adhesive that holds the two materials together withstands repeated cleanings even with harsh solvents or gasoline.

These filters are slightly smaller than stock to increase air space around the filter, improving circulation and air flow. A thick, flat breathable foam gasket forms a grease free sealing ring that ensures maximum contact with your airbox.

This kit includes 2 fire resistant pre-oiled air filters and 2 plastic filter frames.

Twin Air Filter's patented design, high quality materials and superior construction deliver unbeatable performance and protection - and make Twin Air Filters the hands-down choice of more World and National Champions than all other filters combined.

An air filter is your engine's only protection against the elements, and your stock filter isn't up to the task. Replace it with a Twin Air- the number 1 filter system proven on motocross tracks around the world.

Twin Air's fused layers of open-pore foam and fine inner foam trap even the smallest particles-without restricting airflow

Twin Air's high quality materials and superior construction deliver unbeatable performance and protection. The hands-down choice of more World and National Champions than all other filters combined.

Twin Air's fused layers of open-pore foam and fine inner foam trap even the smallest particles-without restricting airflow.

• Dual-bonded foam design filters out even the smallest dirt particles, while allowing more airflow than two separate layer filters (flow bench proven)
• Twin Air filters are slightly smaller than stock to make them easier to change and to increase dead air space around the filter for better performance
• Flat foam sealing ring securely seats against the airbox, even in the worst riding conditions

• Dual-bonded foam design filters out even the smallest dirt particles, while allowing more airflow than two separate layer filters (flow bench proven)
• Twin Air filters are slightly smaller than stock to make them easier to change and to increase dead air space around the filter for better performance
• Flat foam sealing ring securely seats against the airbox, even in the worst riding conditions

• Dual-bonded foam design filters out even the smallest dirt particles, while allowing more airflow than two separate layer filters (flow bench proven)
• Twin Air filters are slightly smaller than stock to make them easier to change and to increase dead air space around the filter for better performance
• Flat foam sealing ring securely seats against the airbox, even in the worst riding conditions

Thick, flat foam, greaseless sealing ring ensures maximum contact with your airbox while acting as a breathable gasket for increased air passage

Features:

• Coarse open-pore foam catches airborn dirt, grime, and sand
• Fine open-pore inner foam acts as second filter to trap the smallest particles while ensuring maximum air passage
• Adhesive withstands repeated cleaning
• Smaller than stock to increase air space and circulation around filter
• exclusively formulated adhesive withstands repeated cleaning. even with harsh solvents or gasoline
• twin air filters are slightly smaller than stock filters to increase air space around the filter and improve circulation

• Dual-bonded foam design filters out even the smallest dirt particles, while allowing more airflow than two separate layer filters (flow bench proven)
• Twin Air filters are slightly smaller than stock to make them easier to change and to increase dead air space around the filter for better performance
• Flat foam sealing ring securely seats against the airbox, even in the worst riding conditions

• Dual-bonded foam design filters out even the smallest dirt particles, while allowing more airflow than two separate layer filters (flow bench proven)
• Twin Air filters are slightly smaller than stock to make them easier to change and to increase dead air space around the filter for better performance
• Flat foam sealing ring securely seats against the airbox, even in the worst riding conditions

Thick, flat foam, greaseless sealing ring ensures maximum contact with your airbox while acting as a breathable gasket for increased air passage

Features:

• Coarse open-pore foam catches airborn dirt, grime, and sand
• Fine open-pore inner foam acts as second filter to trap the smallest particles while ensuring maximum air passage
• Adhesive withstands repeated cleaning
• Smaller than stock to increase air space and circulation around filter
• exclusively formulated adhesive withstands repeated cleaning. even with harsh solvents or gasoline
• twin air filters are slightly smaller than stock filters to increase air space around the filter and improve circulation

Twin Air Filter's patented design, high quality materials and superior construction deliver unbeatable performance and protection - and make Twin Air Filters the hands-down choice of more World and National Champions than all other filters combined.

The air filter is your engine's only protection against the elements, and your stock filter isn't up to the task. Replace it with a Twin Air-the #1 filter system proven on motocross tracks around the world.

Twin Air's fused layers of open-pore foam and fine inner foam trap even the smallest particles-without restricting airflow.

These Twin Air Dual-Stage air filters deliver unbeatable performance and protection which is why they are the hands-down choice of more world and national champions than all other filters combined. Twin Air's fused layers of open-pore foam and fine inner foam trap even the smallest particles without restricting airflow. 

This filter kit includes a new air filter cage.

Twin Air's high quality materials and superior construction deliver unbeatable performance and protection. The hands-down choice of more World and National Champions than all other filters combined.

Twin Air's fused layers of open-pore foam and fine inner foam trap even the smallest particles without restricting airflow.

Twin Air's patented design, high quality materials and superior construction deliver unbeatable performance and protection - and make Twin Air Filters the hands-down choice of more World and National Champions than all other filters combined.

An air filter is your engine's only protection against the elements, and your stock filter isn't up to the task. Replace it with a Twin Air - the #1 filter system proven on motocross tracks around the world.

Twin Air's fused layers of open-pore foam and fine inner foam trap even the smallest particles-without restricting airflow.

Twin Air Filter's patented design, high quality materials and superior construction deliver unbeatable performance and protection - and make Twin Air Filters the hands-down choice of more World and National Champions than all other filters combined.
An air filter is your engine's only protection against the elements, and your stock filter isn't up to the task. Replace it with a Twin Air- the number 1 filter system proven on motocross tracks around the world.
Twin Air's fused layers of open-pore foam and fine inner foam trap even the smallest particles-without restricting airflow

Twin Air Filter's patented design, high quality materials and superior construction deliver unbeatable performance and protection - and make Twin Air Filters the hands-down choice of more World and National Champions than all other filters combined.

The air filter is your engine's only protection against the elements, and your stock filter isn't up to the task. Replace it with a Twin Air-the #1 filter system proven on motocross tracks around the world.

Twin Air's fused layers of open-pore foam and fine inner foam trap even the smallest particles-without restricting airflow.

• Dual-bonded foam design filters out even the smallest dirt particles, while allowing more airflow than two separate layer filters (flow bench proven)
• High quality materials and superior construction deliver unbeatable performance and protection
• Backfire-resistant layer of foam laminated to the inside

Thick, flat foam, greaseless sealing ring ensures maximum contact with your airbox while acting as a breathable gasket for increased air passage

Features:

• Coarse open-pore foam catches airborn dirt, grime, and sand
• Fine open-pore inner foam acts as second filter to trap the smallest particles while ensuring maximum air passage
• Adhesive withstands repeated cleaning
• Smaller than stock to increase air space and circulation around filter

• Dual-bonded foam design filters out even the smallest dirt particles, while allowing more airflow than two separate layer filters (flow bench proven)
• Twin Air filters are slightly smaller than stock to make them easier to change and to increase dead air space around the filter for better performance
• Flat foam sealing ring securely seats against the airbox, even in the worst riding conditions

Replacement filter only.  Must have Twin Air filter cage for proper installation.

• Dual-bonded foam design filters out even the smallest dirt particles, while allowing more airflow than two separate layer filters (flow bench proven)
• Twin Air filters are slightly smaller than stock to make them easier to change and to increase dead air space around the filter for better performance
• Flat foam sealing ring securely seats against the airbox, even in the worst riding conditions
• Complete kit that includes a new cage.  Replacement foam can be purchased separate for routine maintenance.

You’d be amazed at the dirt and debris that can work its way into your gas can – and from there, your fuel tank. Twin Air’s monofilament screen pocket inserts in your tank to catch particles as small as 40 microns (.00165”) while allowing the gas to flow freely. 

The flange is custom-sized for each modern 4-stroke model to ensure a leak-proof seal. Just remove the filter periodically, turn it inside-out, and clean out the debris that could have been in your engine.

Will not work with factory locking gas caps.

New from Twin Air, a forged aluminum KLR650 folding shift lever with your choice of Black, Blue, or Green tip. These are 3/4" longer than the stock lever which makes for easier shifting while standing, as well as for those with a larger boot size.