Next year marks the 40th anniversary of Yamaha’s first World Motocross Championship title and the Japanese manufacturer has released details of the new 2013 models.
The YZ250F sees all the changes in Yamaha’s 2013 line-up and a pimping new white and black colour-scheme. Revisions to ignition settings, an 8.7% lighter piston assembly, 2mm diameter larger carburettor main bore Yamaha is claiming “noticeably improved throttle response and power at mid-to-high speeds, as well as improved fuel efficiency.”
The chassis is stronger too with additional bracing added internally to the top rails of the bilateral beam frame and the rear swingarm mounts have a larger surface area, but if we’re honest we not sure yet what the hell difference that makes. Rest assured when we see someone important from Yamaha, we’ll ask. The engine mounting brackets have also been adapted to compliment the frame changes.
Up front, the YZ250F has basically robbed parts from the 450. The fork outer tubes, bottom yoke and handlebar crown aim to improve stability on jumps and turns. With this (and the above chassis changes) overall rigidity now increased by a claimed 150%. Fork offset is reduced by 3mm (25mm to 22mm) and damping settings have also been revised to suit the new configuration. The shock piston rod has been reduced in diameter by 2mm and the rebound fluid passage modified to improve damping performance over the entire stroke.
Across the rest of the range, including the YZ450F, YZ250, YZ125 and YZ85/LW 2-strokes, WR-F enduro models, TT-R125, TT-R504-stroke junior bikes and legendary PW50 things are pretty much as you were.
YZ-F, YZ, WR-F, PW and TT-R 2013 models are available in Racing Blue, the YZ450F and YZ250F models are available in Racing Blue and Sports White.
Prices have yet to be released.
For more details check out the next issue of Dirt Bike Rider or visit www.yamaha-motor-co.uk