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A new larger capacity ACM (alternating current magneto) is used to eliminate the need for a battery.
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Automatic decompression system ensures easy starts in any gear with no manual lever to fuss with.
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All new air box (located behind the steering head) features a straight shot intake boot and a new washable, dual-stage, foam air filter.
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All new "Tornado" design exhaust system exits from the "rear" of the cylinder. The spiral winding of the header pipe provides the correct "tuned" length and takes full advantage of the exhaust "pulse" effect to maximize cylinder filling. There is a "resonator" (or power chamber) built into the header pipe. Another benefit of this new exhaust system is mass centralization.
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New re-packable lightweight aluminium / stainless steel muffler has been designed to optimize the performance of the new engine. This muffler complies with both CMRC and AMA 2010 noise limits.
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Revised compact, lightweight, single core, dual radiators provide outstanding cooling efficiency.
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All new ECU controls the ignition and fuel injection processes. There is also a "G" sensor system that will shut down the fuel injection system if the bike lies on its side for more than 10 seconds. There is no special procedure to re-start the bike…just kick it and go. The ignition timing maps are all new to maximize the benefit of both the FI system and the new engine characteristics.
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Works-style race-spec "barrel adjuster" for on-the-fly clutch adjustability.
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Easy access oil filter.
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All new, compact "bilateral beam" aluminium frame centralizes mass for exceptional handling. This 450 cc class specifically designed frame consists of a "High Solid Die Cast" head pipe, hydro formed main rails plus various forged and extruded components. This all new frame is compact and offers significantly improved "rider - machine communication" (a.k.a. feedback). The engineers have optimized the balance between strength, rigidity and flex. The key goal of this new chassis is faster and easier cornering…one of the keys to winning races. The engineers started with a clean sheet of paper and designed the chassis based on the requirements of a 450 cc motocrosser. Note: the YZ450F frame is unique unto itself.
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The rigidity balance of this new frame has been optimized and features high lateral and torsional rigidity with "tuned flex" in the longitudinal direction. The result is a feeling of lightness, agility and traction.
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New, lightweight, tapered, aluminium swingarm is produced using "hydro forming", a special method that uses high pressure liquid to form shapes. The shock is now positioned in-line with the central axis of the bike and there are new linkage mounting locations on the swingram. The rear axle pinching area is thicker and stronger, while the swingarm pivot shaft is now 17 mm.
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Lightweight removable rear sub frame is constructed of square-section, lightweight aluminium pipe. The detachable design allows easy access when servicing rear suspension components.
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New cast aluminium upper and forged aluminium lower triple clamps are revised and reduce the fork off set (from 25 mm to 22 mm) and offer great rigidity and strength.
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As in 2009, there are a total of 4 different handlebar positions available (thanks partly to the offset design of the aluminium handlebar clamps) with an adjustment range of 30 mm, to suit a wide variety of riders.
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Pro Taper bars provide excellent strength and durability. Foam handlebar pad is included.
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Revised 48 mm, adjustable, inverted, Kayaba cartridge forks offer an additional 10 mm of travel for 2010. These forks feature a twin-chamber design which means the damper unit is in a separate structure which prevents aerated fork oil from entering the inner damper assembly and reducing its damping abilities. Since the inner damper is pressurized, it also eliminates bubbles forming in the oil. Front fork adjustments include: 20-way compression damping and 20-way rebound damping. Optional fork springs are available through Genuine Yamaha parts.
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The balance between the inner and outer tubes is optimized, while the Kashima coating on the pressure tank and the piston rod reduce friction for smoother suspension performance. The cylinder diameter is 24 mm for excellent primary cushioning.
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The 48 mm inverted KYB fork also features a Transfer Control Valve (TCV). The TCV enhances the damping force from mid to full stroke and improves bottoming characteristics. The benefit of TCV is more precise control throughout the full suspension stroke. The TCV is located on the upside of the spring and its function is controlled by piston speed, not piston position…hence the term "Speed Sensitive fork".
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"Kashima coating" has been applied to the fork tubes to reduce friction for smoother suspension performance. Front wheel travel is 310 mm (12.2 in.).
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Revised, large "wrap-around" plastic fork protectors provide excellent lower fork tube protection. The "self-supporting"" design reduces friction for smoother fork operation.
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New Monocross link rear suspension system features a revised fully adjustable Kayaba, piggyback shock which provides 315 mm (12.4 in.) of wheel travel and features separate adjusters for high- and low-speed compression damping. The shock is now in-line with the center axis of the bike for excellent control. Adjustments include: spring preload, 20-way rebound damping, 20-way low-speed compression damping and 2 turns of high speed compression damping.
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The revised shock uses an 18 mm diameter piston rod. Kashima coating is used in the shock body and sub tank to reduce friction and improve suspension performance during a long moto. The Kayaba shock utilizes a full rebound oil lock system for excellent suspension function and great ride quality. The shock spring location is 30 mm lower than last year, reducing the centre of gravity.
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250 mm floating front wave-style disc reduces weight, improves cooling and adds style too. The disc is squeezed by a Nissin twin piston caliper fitted with lightweight aluminium pistons.
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"Shorty style" adjustable front brake lever.
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245 mm rear disc brake features a "wave-type" disc. The rear disc is squeezed by a single Nissin piston caliper.
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Lightweight, compact, integrated Nissin rear master cylinder (fluid reservoir is integrated into the top of the master cylinder) provides strong stopping power with excellent feel and control.
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The rear caliper and the lower portion of the wave disc are protected by heavy duty plastic protectors.
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Newly designed, compact body work includes front number plate, front fender, rad shrouds, fuel tank, side panels and rear fender which enhance the lightweight feel and look of the new YZ450F. This new "minimal" bodywork is a flat design, allowing for fast, easy rider movements. The ergonomics provide a natural and roomy riding position. The body has been designed to maintain it good looks throughout the life of the machine.
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The lightweight, plastic resin 6 litre fuel tank is located under the seat, once again reducing the centre of gravity and centralizes mass for exceptional handling performance.
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New lightweight Sun Star rear sprocket.
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Lightweight, 21 in. front and 19 in. rear Excel rims provide exceptional durability and help reduce unsprung weight for optimal suspension performance and handling.
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Large 25 mm rear axle and a hub design which features a second bearing on the sprocket side for increased rigidity.
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New polypropylene engine and water pump guards reduce weight.
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Lightweight, extra wide foot pegs provide excellent grip and ground clearance.
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Folding shift lever tip helps prevent damage.
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Stainless steel, inner clutch cable provides excellent strength and long life.
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Lightweight chain guide / support helps reduce chance of chain derailment. Also helps protect rear sprocket damage too.
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Heavy duty rubber swingarm protector.
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Heavy duty DID 520 drive chain.
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Convenient oil level sight glass.
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All new, "reversed" liquid-cooled, 450 cc, DOHC, four-valve, four-stroke, single with fuel injection and titanium valves. The engine has been tuned for excellent "drivability and controllability" one of the most important keys to fast lap times. The engine delivers a broad power curve with a great over-rev capacity.
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This all new, unique engine design features a rearward slanting cylinder that is "reversed" compared to traditional designs. The FI throttle body and air box are front mounted while the exhaust exits from the rear of the cylinder. This design is used to centralize mass for excellent handling and a light feel. The other major benefit is the straight shot intake system which maximizes power output. The engine is slanted 7.5 degrees rearward.
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The "reversed" design allows for a straight intake path into the cylinder, providing maximum intake flow and efficiency for excellent power. The front positioned intake means that engine heat will have less "heating effect" on the incoming fuel charge (cooler fuel helps increase power).
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Centrally located spark plug and the new design of the four-valve head promotes a "tumbling effect" of the inbound fuel / air for better combustion, improved throttle response and power output.
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All new, compact, four-valve cylinder head design, features a 12.5:1 compression ratio (Vs 12.3 for '09). The intake valves are 36 mm in diameter and the exhaust valves are 30 mm.
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Lightweight titanium valves (intake and exhaust) and new load-reduced oval valve springs reduce reciprocating mass for less friction, faster-revving and smoother-hitting power delivery across the rev range.
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The bore has been increased by 2 mm while the stroke has been shortened by 2.6 mm compared to last year's model.
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Automatic cam chain tensioner reduces maintenance and new cam chain "sliders" reduce internal frictional losses.
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All new, hollow design intake and exhaust camshafts feature new valve timing and lift specifications for improved power.
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The lightweight aluminium cylinder features a ceramic composite coating which is applied directly to the aluminium, eliminating the need for a heavy iron sleeve or liner. The ceramic coating insures faster, more uniform heat dissipation, reduced friction and a longer service life.
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The cylinder is "offset" relative to the crankshaft to reduce frictional losses between the piston and the cylinder wall during the power stroke. This offset design is a first on a Yamaha motocross machine.
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New, more rigid crankcase to accommodate the increased engine power.
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New design crankcase utilizes an integrated oil tank inside the cases to supply oil to the dry sump lubrication system. This design concentrates mass lower in the frame for optimum handling and lighter weight feeling. There are no exterior oil lines with this design and the internal oil tank is designed to promote air - oil separation.
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Special cylinder design features cutaways that allow the air "trapped" under the piston to enter a side chamber (or cutaway) to reduce horsepower-robbing "pumping losses".
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The crankcase also utilizes cutaways to reduce "pumping losses". The crankcase cutaways match the cutaways in the cylinder for maximum efficiency.
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All new short-skirt, forged piston provides excellent reliability, less mechanical vibration and reduced weight.
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Newly designed piston rings reduce friction for improved power and reduced oil consumption.
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Piston oil cooler utilizes a pinpoint nozzle that directs oil to the desired portion of the cylinder and underside of the piston, which reduces piston, cylinder and rod temperatures for great durability.
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Oil volume in the engine has been optimized to reduce weight and oil drag related power losses.
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Revised, lightweight gear driven balancer shaft reduces vibration for improved rider comfort and less rider fatigue.
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The crankcase features a tri-axis layout for the crank, main and drive axles. This tri-axis design keeps the crankcase more compact while also centralizing mass for excellent handling. All of the shafts are positioned low in the cases to maintain a low centre of gravity.
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Revised multi-plate wet clutch features a new clutch push lever assembly and revised push rod. The benefit is improved clutch feel and reduced clutch lever effort.
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Revised, five-speed transmission features "involute splines" on the transmission axles to ensure smooth shifting and instant hook-up under power. There are numerous changes to the transmission including engagement dog shape, shift cam "pattern" and revised shift forks. The benefit is smooth, positive shifting.
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Five-speed transmission optimizes engine performance. This 5-speed transmission provides great performance and makes the YZ450F very versatile for MX, Hare Scrambles, Super Moto, Ice Racing and Enduro type applications.
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Quick-access, lightweight magnesium outer clutch cover for fast, easy clutch maintenance.
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All new Keihin 44 mm throttle body fuel injection system is a battery-less design for reduced weight and is designed specifically for MX applications. The 12-hole injector maximizes fuel atomization for more complete combustion and great power output. The benefits of fuel injection include constant ongoing adjustments to insure the optimum fuel - air ratio regardless of outside air temperature and altitude. Other benefits include improved starting and improved throttle response. The system is equipped a throttle position sensor (TPS), plus a range of sensors (engine temp, outside air temp and air pressure etc.). There is also a cold start and fast idle knob which doubles as an idle adjuster too.
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The injector spray pattern, spray direction and the distance to the intake valves have been optimized, while the specially designed straight intake tract helps to maximize the benefits of the FI system and overall power output.
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Optional, compact, hand held "YZ Power Tuner" allows tailoring of both fuel injection settings and ignition mapping. Nine (9) different setting points can be accessed for both the FI and ignition maps. Maps can be stored and shared with other Power Tuners if desired. The days of removing a carb to make jetting changes are gone.
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New, compact, lightweight in-tank electric fuel pump.
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