2021 Yamaha MOUNTAIN MAX 800 154 Service and Repair Manual

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The 154 and the 165 Mountain Max 800 were documented together for 2021, under Yamaha part number LIT-12618-03-80. Model code MM8N54ML is the 154, and it is that code the manual uses when a procedure or a specification applies to one track length and not the other.

Work through it and you get the factory approach in order: periodic maintenance tables, then diagnosis, then removal, inspection against service limits, and reassembly with specified torque. Electrical faults are handled with full wiring diagrams and connector-level checks rather than component swapping.

Fitment check: MM8N54ML, LIT-12618-03-80. If the sled you are servicing is the longer-track version, the same book applies.

Mountain riding is hard on the driveline, and the drive and track chapters are the ones that get opened most on a sled used the way this one was built to be used. Having the factory clearances there, in print, keeps guesswork out of a rebuild.

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