The 2012 Polaris RMK 155 is a mountain snowmobile engineered for exceptional performance in deep snow conditions. Featuring a lightweight chassis and agile handling, this model is designed to excel in backcountry riding, offering an immersive experience for riders. Its 600cc Liberty engine, a 2-stroke liquid-cooled unit, delivers approximately 115-120 HP, providing ample power for challenging terrain. The RMK 155 is built upon Polaris's strong heritage in snowmobile innovation, consistently recognized for its deep snow capabilities and rider ergonomics, making it a formidable choice against competitors like the Ski-Doo Summit and Arctic Cat M8. This comprehensive workshop service manual provides detailed information for the maintenance, repair, and troubleshooting of your 2012 Polaris RMK 155. It covers all essential systems, including the engine, fuel system, ignition, drive system, suspension, steering, braking, and electrical components. The manual offers step-by-step procedures for routine maintenance, major component rebuilds, and diagnostic guides, ensuring that both experienced mechanics and serious DIY enthusiasts can effectively maintain the peak performance of their snowmobile. With detailed technical specifications and guidance on specialized tools, this manual is an indispensable resource for keeping your RMK 155 in optimal condition.