The Yamaha YZ85 features a considerable number of changes for 2019, especially for a youth motocross bike, with new engine parts, updated suspension components, and a revised chassis. Read on to learn more about the specifics made to the blue motocrosser.

Engine

The YZ85 engine now features a Yamaha Power Valve System (YPVS) designed to deliver a broad, tractable power across the rev range without losing peak power at high rpm to improve drivability and reduce the need for frequent shifting. Designed to match with the new YPVS engine is a new expansion chamber that optimizes exhaust gas flow for enhanced power delivery, especially in the low-end and midrange.

A new cylinder head and longer connecting rod are designed to work together and boost the compression ratio for enhanced power output. The transmission has been revised as well and increases the width of selected gears to provide better gear engagement and smoother shifts. Lastly, a new crankcase design features a spacer-style reed-valve intake for improved gas flow.

Suspension

A KYB 36mm inverted cartridge fork graces the YZ85 and features new one-piece outer tubes and updated settings designed to offer enhanced performance across a…

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