2014 Yamaha YZ450F and YZ250F models revealed in America

A couple of months ago, the world was treated with a first tantalising look into what was assumed to be a pre-production 2014 Yamaha YZ450F. This morning, Yamaha released details on their revamped 2014 YZ450F and YZ250F models in the US.

For 2014, Yamaha introduces a completely new YZ450F, featuring a new chassis, motor refinements, and suspension upgrades. The YZ250F gets Electronic Fuel Injection, and will feature the same design elements as the YZ450F. The biggest news is that the 250 also gets a four-valve, reverse cylinder DOHC engine – the same as the 450 received in 2010. Essentially, the only parts on the 2013 models that will remain on 2014 machines are the front fender, front number plate, brakes, Kayaba suspension, and rear wheel. Here’s a quick insight into a few of the upgrades each bike gets…

2014 Yamaha YZ450F

• Revised piston, intake, exhaust valves and ports, valve mechanism, ignition timing and fuel injection
• New high-performance ECU
• New wet-sump oil system
• New shifting mechanisms
• New bilateral beam frame
• New larger diameter front axle and top triple clamp
• New layout for airbox and fuel tank
• Exhaust now circles the cylinder before connecting to muffler
• Slimmer radiator design

2014 Yamaha YZ250F



• Shares bodywork with YZ450F
• New DOHC four-valve, fuel injected engine with the same straight intake, rear-inclined cylinder and rear-positioned exhaust layout as the YZ450F
• New Electronic Fuel Injection
• New aluminum bilateral beam frame
• New front and rear suspension settings
• Exhaust now circles the cylinder before connecting to muffler

Video

For extended details on both models, click here. We’ll keep you posted regarding an Australian release date and pricing.