Yamaha RD400 HiFlo Air Filter Upgrade

Description Yamaha RD400 HiFlo Air Filter Upgrade – This is the unbaffled Eruopean spec version of RD400 air filter. This can be used in the USA spec RD400 as a performace upgrade but we recommend jetting up to 27.5 pilot and 140 main jet for stock bike with stock pipes (links below). This is a branded (HIFLO) paper element filter true to the original. Pilot jets: Pilot Jets Main Jets: Main Jets