It currently has a 450 cc (27 cu in) liquid-cooled single-cylinder engine.
[1] The YZ450FX features a wide ratio transmission, 18" wheel, electric start and kickstand.
The frame is the same as the YZ450F of that year but with different engine mount brackets.
[1] The second generation YZ450FX was introduced in 2019 and featured an all new engine, updated suspension settings, revised chassis, and a wireless, smartphone based engine tuning app.
The third generation YZ450FX was introduced in 2021 and featured a lighter cylinder head, new camshafts and piston, and a longer connecting rod.