KN Planning Cygnus X Type 1 to Type 4 BWS-R BWS125 BWSR BW'S125 Starter Clutch Reinforced Starter One-way ClutchReinforced one way starter clutch [Compatible models] Cygnus X [Type 1 to Type 4] Domestic Taiwan BW'S 125 [5S9] BW'S It comes with 5 rollers instead of the 4 rollers of the genuine one way starter clutch. Since there is one more clutch roller, it adheres more strongly to the starter gear. Recommended for bore up vehicles and vehicles with higher compression than the original. Manufacturer: KN Kikaku Brand: KN KIKAKU Manufacturer reference: KN C4 WG