Kimpex - 90°,6` `Twin Side Effect` Carbide Runner for Jagged Edge - Yamaha (DO-699) K-Type-Universal Air Filters Exceptional Filtration Efficiency:Achieves 98–99% efficiency

Exceptional Filtration Efficiency:Achieves 98–99% efficiency (per ISO 5011 standards)

This rough surface literally bites into the head of the screw

Easy to understand premix ratio graduations for 32:1

potentially damaging the complex valve mechanism or mounting threads

Kimpex - 90°,6` `Twin Side Effect` Carbide Runner for Jagged Edge - Yamaha (DO-699) K-Type-Universal Air Filters Exceptional Filtration Efficiency:Achieves 98–99% efficiencyThese carbide deuce bars are the toughest on the market and are great for people who like superior control on hard or icy surfaces. Meets OEM specifications. They are available in 4` and 6` and 60 & 90 Sold by unit.