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motocross.transworld.net

Technical Briefing Of The All-New 2019 Yamaha YZ250F

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2019 YAMAHA YZ250F | COMPLETE ARCHIVE
2019 FIRST IMPRESSION | COMPLETE ARCHIVE

www.yamahamotorsports.com

Few modern-day motorcycles have a history like the Yamaha YZ250F. Debuted in the early 2000s, it was the very first four-stroke motocross machine of its displacement and it immediately indicated that the two-stroke 125cc reign that we had come to know and love was near the end. Yamaha refined the machine through the early years with new frames and engine designs, but not at the pace other OEMs and by 2011, the outdated carbureted engine and aluminum frame were among the least liked in the division. That all changed in 2014, when Yamaha started with a clean slate and dropped a more powerful fuel injected powerplant into a reconfigured chassis and again became a leader in the 250 class. Even with all of the accolades, including professional championships through the Star Racing team and praise by the media, Yamaha decided that the YZ250F would benefit from further improvement and for 2019, the bike features another all-new frame, engine package, and assorted components.

2019 YAMAHA YZ250F UPDATES & FEATURES

All-new engine with electric starter, reconfigured cylinder head with new valve train, intake camshaft, higher compression piston, and Mikuni throttle body for improved mid to top performance

All-new frame design with revised geometry for increased stiffness and stability

Revised ECU settings

Updated exhaust system with new head pipe shape and rubber mounted muffler
Dual electrode sparkplug (LMAR9E-J)

New clutch with increased diameter, increased number of clutch springs, increased steel plate thickness, and reduced number of friction plates

New plastic body panels and flatter seat for improved rider movement

New fork lugs

New thinner and lighter tapered handlebars

Revised KYB suspension with updated internal parts and stiffer spring rates

Reduced capacity fuel tank

Flat air filter element

New radiators

Yamaha Power Tuner smartphone application compatibility for ignition and fuel map adjustability