Yamaha YZ85 2021 Owner's Manual

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Periodic maintenance and adjustment7-207 Insufficient brake fluid may al-low air to enter the brake sys-tem, reducing brakingperformance. Clean the filler cap before re-moving. Use only DOT 4 brakefluid from a sealed container. Use only the specified brake flu-id; otherwise, the rubber sealsmay deteriorate, causing leak-age. Refill with the same type ofbrake fluid. Adding a brake fluidother than DOT 4 may result in aharmful chemical reaction. Be careful that water does notenter the brake fluid reservoirwhen refilling. Water will signifi-cantly lower the boiling point ofthe fluid and may result in vaporlock.EAU51721Changing the brake fluidHave a Yamaha dealer change thebrake fluid at the intervals specified inthe periodic maintenance and lubrica-tion chart. In addition, have the oil sealsof the master cylinders and calipers aswell as the brake hoses replaced at theintervals listed below or whenever theyare damaged or leaking. Oil seals: Replace every twoyears. Brake hoses: Replace every fouryears.EAU22762Drive chain slackThe drive chain slack should bechecked before each ride and adjustedif necessary.EAU84401To check the drive chain slack1. Place the motorcycle on a suitablestand. (See page 7-26.)2. Confirm the rear wheel is off theground and the rear shock ab-sorber is fully extended.3. Shift the transmission into neutral.4. Pull up the drive chain until thechain is taut, and then measuredistance A between the top of theswingarm and the bottom of thechain as shown.1. Distance A11