This Service Manual Supplement provides essential information for the 2005 Yamaha RX-1, APEX, ATTAK, and MOUNTAIN series snowmobiles. These models represent a significant advancement in snowmobile technology, notably featuring Yamaha's groundbreaking multi-cylinder, fuel-injected 4-stroke engines, which offered a new benchmark in performance and refinement. The RX-1 series, in particular, was lauded for its innovative approach, moving away from traditional 2-stroke powerplants to deliver a smoother, more powerful, and environmentally conscious riding experience. This supplement is designed to complement the 2003 Yamaha Service Manual, focusing on the specific updates, modifications, and new procedures introduced for the 2005 model year, ensuring owners and technicians have the most accurate and up-to-date guidance.

The purpose of this manual is to facilitate the comprehensive maintenance, diagnosis, and repair of your 2005 Yamaha snowmobile. It covers critical systems including the Genesis 150FI and Genesis 120FI engines, the ProComfort IFS and ProActive suspension systems, the CVT drivetrain, and the electrical components. Detailed procedures for maintenance, troubleshooting, adjustments, and repairs are provided, along with updated wiring diagrams and diagnostic information. This supplement is an indispensable resource for ensuring the optimal performance, reliability, and longevity of your snowmobile, offering the advanced technical depth required for professional service and detailed owner upkeep.