The WR450F celebrates its 20th year in production with a complete revision based on the latest-generation YZ450F motocross platform. Linear, tractable power, pinpoint handling, proven Yamaha reliability and YZ-derived performance make the new WR450F a wise choice for today's most demanding enduro racers and recreational enthusiasts alike.
Features & Benefits
Key Improvements for 2019
YZ450F-based, "reversed" liquid-cooled, 450 cc, DOHC, 4-valve (titanium), 4-stroke, single with fuel injection & electric starting.
Rearward-slanted, reversed cylinder design.
"Reversed" engine design - FI system is front-mounted, exhaust exits from rear of cylinder.
Electric start with auto decompression system.
There is no main ignition switch on this model.
Compact 4-valve cylinder head features a 12.8:1 compression ratio.
Lightweight titanium valves use load-reduced valve springs.
Automatic cam chain tensioner.
Lightweight hollow intake & exhaust camshafts.
Lightweight, ceramic composite coated aluminum cylinder.
Special cylinder "cutaways" allow air "trapped" under the piston to enter a side chamber (or cutaway).
Crankcase also utilizes cutaways which match the cutaways in the cylinder for maximum efficiency.
Lightweight, short-skirt, forged aluminum piston.
Piston oil cooler jet nozzle directs oil to the desired portion of the cylinder, rod & underside of piston.
YZ450F crankshaft & connecting rod feature a carburizing process for excellent durability.
Lightweight, gear-driven counterbalancer shaft.
5-speed, wide ratio transmission utilizes a 2-bar, floating shift guide system & a 14 mm shift shaft.
Heavy duty, multi-plate, clutch with quick access magnesium outer cover.
44mm Keihin throttle body fuel injection system.
Optional, compact, hand held "GYTR Power Tuner" allows tailoring of both fuel injection duration & ignition mapping.
Forward mounted air box features a washable, dual-stage, foam air filter.
Wet sump lubrication system.
Easy access "cartridge-type" oil filter for fast, easy oil changes.
Lightweight, single-core, dual radiators with electric cooling fan.
Maintenance-free transistor controlled ignition (TCI).
High capacity AC magneto to power the FI system.
Lightweight, wrap-around exhaust system based on YZ450F design.
Lightweight aluminum / stainless steel muffler (aka silencer).
Chassis / Suspension
Lightweight, tapered aluminum swingarm.
Lightweight detachable rear sub frame.
YZ450F-based, 48mm, adjustable, inverted, Kayaba "SSS" cartridge fork with 310mm (12.2") of wheel travel.
Large wrap-around plastic fork protectors provide excellent lower fork tube protection.
YZ450F-based, Monocross link rear suspension features a fully adjustable Kayaba piggyback shock with 318 mm (12.5") of wheel travel.
270 mm floating front wave-style disc & compact twin-piston Nissin caliper.
Shorty-style adjustable front brake lever can be adjusted to fit various hand sizes.
245 mm rear disc brake features a wave-style disc & single-piston Nissin caliper & master cylinder.
Rear caliper & lower portion of the disc are protected by heavy duty plastic protectors.
Lightweight, plastic resin 7.9-litre fuel tank
Adjustable handlebar holders offer a total of 4 different positions with an adjustment range of 30 mm (1.2").
Compact bodywork with embedded graphics
Flat seat design.
Rugged Excel rims fitted with Dunlop tires.
Lightweight digital meter assembly.
Stylish, slim design 35-watt headlight.
Brilliant LED rear taillight.