2013 Yamaha Yz250 on 2040-motos

Yamaha YZ description

2013 Yamaha YZ250, 2013 Yamaha YZ250 2-Stroke Features and Benefits Liquid-cooled, 249cc, piston-reed-valve-inducted, 2-stroke engine is lightweight and compact. Ceramic composite cylinder bore is a "liner less" design with the ceramic coating sprayed directly on the aluminum block. The benefits include reduced weight (no heavy iron liner), reduced friction, extended cylinder life and excellent heat dissipation for consistent power delivery. YPVS power valve system features a total of three slides (one main and two auxiliary slides) which provides the benefits of both solid, low rpm power delivery and a strong top-end punch. The YPVS system varies the exhaust port height and timing based on engine rpm. Keihin PWK38S carburetor with power jet and throttle position sensor (TPS) ensures precise fuel/air mixing and extra-crisp throttle response throughout the powerband. Special-design, 4-petal, carbon fiber reeds provide great throttle response and engine performance across the entire RPM range. Smooth-shifting, 5-speed, close-ratio transmission with heavy-duty, multi-plate clutch ensures optimal hook-up for outstanding acceleration and corner-exiting power. Transmission shafts utilize involute splines for smooth, positive shifting even under power. Quick-access, outer clutch cover allows for fast, easy clutch maintenance CD (capacitor discharge) ignition system delivers a precise spark and monitors engine speed to ensure optimal timing for faster, stronger response during hard acceleration. Washable, dual-stage, foam air filter reduces maintenance costs. Large-capacity, dual radiators feature a 10-row core to deliver maximum cooling efficiency. Computer designed expansion chamber provides maximum engine performance while the lightweight, aluminum silencer is rebuildable so performance can be maintained at the optimum level and noise levels can be controlled. Trick, works-style clutch lever features a race-spec "barrel adjuster" for on-the-fly clutch adjustments.