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The original YZ250 of 1974 used an air-cooled 250cc two-stroke engine of 70 mm bore and a 64 mm stroke, which was improved semi-annually. The air-cooled motor was replaced in 1982 with a 249 cc liquid-cooled two-stroke reed-valved engine with a mechanical, rather than servo-driven, YPVS exhaust valve for a wider spread of power.
The Yamaha YZ250F is a motocross motorcycle first released in 2001 by Yamaha. It features a DOHC , four-stroke engine and initially had a steel frame and subframe in 2001–2002. In 2003 it received an aluminum subframe, which was replaced in the 2006 model with an all-aluminum frame.
The 2025 FIM Motocross World Championship is the 69th FIM Motocross World Championship season. [ 1 ] In the MXGP class, Jorge Prado won his fourth world title in the 2024 season, however, he will not defend his title due to his move to compete in the America-based SuperMotocross World Championship series.
The Yamaha WR250F is an off-road motorcycle made by Yamaha Motor Company.It has a 250 cc (15 cu in) liquid-cooled single nikasil coated cylinder engine. First offered in 2001, it shared many components and design concepts with the YZ250F motocross model.
Yamaha engineer Yoshiharu Nakayama first came up with the idea of creating the first competitive four-stroke race motocross bike. [6] The Yamaha YZ400F was developed to fit into this category. It solved the power dilemma by borrowing superbike technology and giving the YZ a five-valve head, liquid cooling and a 12.5-1 compression ratio.
The 2025 FIM MotoGP World Championship will be the premier class of the 77th Fédération Internationale de Motocyclisme (FIM) Road Racing World Championship season, the highest level of competition in motorcycle road racing. Jorge Martín (pictured in 2023) will enter the season as the defending world champion.