2021 Yamaha MOUNTAIN MAX 800 165 Service and Repair Manual

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Yamaha's 2021 book for the Mountain Max 800 is LIT-12618-03-80 and it serves both track lengths. The 165 is model code MM8N65ML; the 154 is documented in the same volume, with the tables distinguishing the two where suspension and track figures diverge.

The content is factory service material: diagnosis charts, disassembly and assembly procedures, inspection limits, tightening torques, wiring diagrams and the periodic maintenance schedule. Nothing is written to persuade you of anything — it tells you what to measure and what the number should be.

Owners of long-track sleds tend to spend their time in the rear suspension and the drive system, and those sections are the reason to have the factory text on hand rather than a general repair guide.

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