1Pcs 4 Pin Relay Starter Solenoid for YFM350 YFZ450 50 90 ATV Quad This starter relay solenoid is designed to fit various ATV and quad models.It serves as a direct replacement for the , performance in engine starting systems.The unit is compatible with select models including YFM350, YFZ450, YFM450, YFM80, YFM100, YFM125, YFM250, YFM400, and other similar variants from the 1980s through the 2010s.It supports electrical systems requiring a 4-pin relay configuration and is commonly used in off-road vehicles where and consistent starter engagement is essential.The solenoid fits models such as 80, 125, 350, 450, 600; Warrior 350; 350; Bruin 250 and 350; Big Bear 250, 350, 400; Breeze 125; Badger 80; Champ 100; and others.It is also suitable for use in select models like CE50, LT-Z50, LT80, KFX80, TW200, WR125, YP125, YP250, YP400, CP250, RZ50, TZM50, TZR50, VP125, VP250, YZF-R125, YZF-R7, 1200, and Big Wheel 200 and 350.Installation is straightforward, replacing the existing relay without modification.This electrical component helps transfer power from the to the starter motor when engaged, playing a critical role in the ignition process.Proper function ensures quick and engine cranking.