Twin Air has a new replacement for the OE air filter on the 2019 Yamaha YZF250 and 2018 and up YZF450, with a specially developed 'PowerFlow' kit aluminium cage and sealing ring for more airflow. The cage is easy to install, and the company says that it "provides improved performance and protection for the engine". The company also offers dust covers, rain covers and GP covers, all available for extra protection during extreme weather conditions.
A twin-layer, reticulated polyester foam filter (available dry or pre-oiled) that was originally developed for the Yamaha MXGP team solves the design flaws inherent in the OE design. Yamaha’s flat-style air filter rests directly on the backfire screen of Yamaha’s downdraft intake system.
The constant vibration of the air filter sucks the air filter oil downward into the intake tract, eventually allowing dirt through the foam as it dries out. Plus, the hole where the external cage’s pin goes through is not reinforced. Under the pulsing of the filter, the foam tears around the pin, creating a potential leak.
The Twin Air design is a 22 mm-thick filter with a large grommet that supports the filter, stopping it from rattling against the backfire screen, and a plastic "top-hat" spacer in the centre of the air filter that lifts it 11 mm above the wire backfire screen to improve airflow. Twin Air’s central grommet eliminates the tearing of the foam at the pin and supports the filter better – reducing the risk of top end damage.
TWIN AIR
www.twinair.com
