This starter solenoid relay is a premium aftermarket replacement compatible with Polaris Snowmobile RMK 600/700/800 (2004), OEM part numbers 4011251 and 4011072。 It controls 12V power flow from battery to starter motor for smooth engine cranking. Heavy-duty fully sealed construction adapts to harsh cold winter environments, effectively solving common starting problems such as intermittent cranking, clicking noises and no-start failure.