Motorcycle specifications YamahaYZ 250 F 2015 American star

In the USA, the YZ 250 F dominates the MX US championship. In Europe, it is on the podium in the MX2 World Championship, and currently leads the Motocross World Championship in the women's category, with two GP round wins.

for 2015, the innovative 4T models benefit from a number of changes aimed at further improving performance and ease of handling. New wraps also enhance their aggressive look.

modifications have been made to the fuel injection and ignition rethe YZ 250 F delivers even greater mid-range power.
For simpler maintenance, the air filter cover is fitted with easy-to-remove fasteners that replace the bolts, and the machine also benefits from some changes inside the engine.

the 2015 models feature new black rims, which, combined with new graphics, give them a decidedly Factory Racing look.

yRRD (Yamaha Rinaldi R&D) is once again offering a "Pro" competition kit on the 2015 YZ 250 F, with a wide range of parts designed to boost performance.

the YZ 250 F kit includes:

- High-compression forged piston kit
- ECU box with YRRD-developed ignition curves and rev limiter increased by 500 rpm
- Optimized cylinder (optimized gas flow)
- Inlet camshaft (optimized cam profile)
- Cylinder head gasket
- High-pressure radiator cap (2.0 bar)
- Stiffer, solid-cut crankcases with factory look
- Lighter connecting rod

yZ 250 F: technical improvements

- Revised fuel injection and ignition settings for more mid-range power
- Lighter throttle opening control
- New, easy-to-remove fasteners on air-filter cover
- New black rims
- New "Factory Racing" graphics
- Modified piston design
- New camshaft profile for easier start-up
- YRRD "Pro" competition kit

Information and image credits: Yamaha