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Yamaha YZ 250 F 2010
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Review: Yamaha YZ 250 F 2010 - A Decade On, Still a Trailblazer
The Yamaha YZ 250 F 2010 – a decade later and it continues to stand tall as the trailblazer that merges user-friendly character with race-ready performance. This bike, when launched, was the first four-stroke 250 MX (Motocross) bike to hit the market, bag an international win, and seize an AMA National and Supercross Championship title. For those who might have forgotten, let’s rewind and revisit what makes the Yamaha YZ 250 F 2010 the gold standard that it is.
Performance and Power
Underneath its compact exterior, the Yamaha YZ 250 F 2010 houses a 250cc liquid-cooled DOHC four-stroke engine with 5 titanium valves. The motorbike offers a sturdy and powerful performance with great torque at low-to-mid ranges, thanks to its newly redesigned valve train components, higher lift cam profile, and a ‘D’ shaped exhaust port. Plus, the redesigned radiator and more compact oil tank result in a greater mass centralization, contributing to the overall power of the bike.
Transmission and Chassis
The Yamaha YZ 250 F 2010 utilizes a Constant-mesh 5-speed transmission coupled with a multiplate wet clutch - ensuring reliable power delivery. The gearbox retains the impressive durability of its predecessor, with a reinforced third, fourth, and fifth gears that offers positive engagement and smoother riding experience. The Bilateral Beam frame is built from a finely composed collection of forged and extruded aluminum parts. It provides unmatched rigidity balance, delivers superb handling, and allows better mass centralization.
Suspension and Handling
With an 11.8-inch-travel Speed-Sensitive System inverted fork at the front and a fully adjustable single shock with 12.0-inch travel at the rear, the YZ 250 F is prepared to tackle any bumps or jumps in its path. The KYB suspension has been meticulously recalibrated to maximize the advantages of the Bilateral Beam frame, resulting in an unmatched handling experience.
Design and Ergonomics
The Yamaha YZ 250 F 2010 boasts a clean, aggressive look with sharp, horizontal lines that emphasize the bike's lightweight and nimble handling character. The ProTaper bars are four-way adjustable and the handlebar mounts and footpegs are set 5mm higher to optimize rider position. The seat and tank are designed flat to provide a more forward riding position, promoting better rider movement.
In retrospect, the Yamaha YZ 250 F 2010 is a testament to the time when Yamaha revolutionized the Motocross world by introducing a four-stroke engine to a class that was dominated by two-strokes. Today, a decade later, the YZ 250 F 2010 remains a symbol of performance, design, and innovation - a motocross bike that holds its ground and prominence amongst the motoring elite.
Manufacturer Info
Yamaha YZ 250 F 2010 Info
Engine Type 250cc liquid-cooled DOHC 4-stroke; 5 titanium valves
Bore x Stroke 77.0mm x 53.6mm
Compression Ratio 13.5:1
Fuel Delivery Keihin® FCR MX37
Ignition CDI
Transmission Constant-mesh 5-speed; multiplate wet clutch
Final Drive Chain Drive
Chassis Suspension/Front Speed-Sensitive System inverted fork; fully adjustable, 11.8-in travel
Suspension/Rear Fully adjustable single shock; 12.0-in travel
Brakes/Front Hydraulic single disc brake, 250mm
Brakes/Rear Hydraulic single disc brake, 245mm
Tires/Front 80/100-21
Tires/Rear 100/90-19
Dimensions Length 85 in
Width 32.5 in
Height 51.3 in
Seat Height 38.9 in
Wheelbase 57.7 in
Ground Clearance 14.8 in
Fuel Capacity 1.7 gal
Approximate Wet Weight 224.8 lb
Other Warranty 30 Day (Limited Factory Warranty)
The all-new, Bilateral Beam frame is specific to the 250 and is more compact than the previous generation chassis. This places the rider closer to the front wheel, which delivers superb rigidity balance for unmatched lightweight handling and cornering. This nimbleness lets the rider get on the gas sooner out of corners and cross the finish line with less fatigue – even on long motos.
The optimized engine delivers a new level of power in low-to-midrange, with a great torquey feel, exactly where riders want it. That is due to the new straight intake boot that enhances breathing, new carburetor that provides excellent throttle response and fuel atomization, and redesigned valve train components that reduce inertial mass and boost low end torque. Exhaust is also enhanced with a new D-shaped exhaust port and newly designed exhaust system. Ongoing refinement to the suspension and engine produces an amazingly balanced, light-handling machine with performance that’s accessible to all levels of riders.
All new styling emphasizes the bike’s light weight and nimble handling character. The sharp, horizontal lines set the bike apart, with a clean, aggressive look.
KYB® suspension has been recalibrated front and rear and is tuned to work with the new Bilateral Beam frame for unmatched handling. The clutch lever has a lighter pull feel even though the clutch has stronger engagement. The new clutch also has a wider engagement range that will give riders an advantage off the line. . . shift after shift, moto after moto.
There’s no disputing the YZ250F’s unmatched four-stroke prowess – it was the 1st four-stroke 250 motocross bike on the market, the 1st to win an international race, the 1st to win an AMA® Supercross ® and the 1st to take an AMA® U.S. Supercross Championship® title, as well as the first to win an AMA® National race.
Engine:
The valve spring retainers are now lightweight aluminum instead of steel, and valve spring pressure is lighter for reduced valve opening force. This contributes to superior low-to-mid range torque characteristics due to less power-robbing friction. There’s also a new, higher lift cam profile, while valve stem ends are chromium-nitride coated for exceptional reliability and reduced maintenance.
The exhaust port shape has a “D” shape instead of round. This increases velocity through the port for excellent throttle response, while enhancing the power feeling of the engine.
The newly designed radiator is lower and further back and the oil tank is more compact and repositioned to achieve greater mass centralization.
The carburetor bore has a new venturi shape, plus there’s recalibrated jetting and a new accelerator pump. This translates to impressive response when the rider snaps open the throttle, and contributes to superb torquey low-to-midrange power characteristics.
The intake boot offers a straight, smooth tract for excellent engine breathing and more power. The airbox is reshaped to tuck neatly into the Bilateral Beam frame.
The exhaust pipe has been carefully tuned to optimize engine power, with a muffler that’s 50mm longer and with a narrower core – a design that lets the YZ250F comfortably meet the latest noise standards without sacrificing power.
Engineers were able to increase the clutch spring load for stronger engagement, yet, thanks to a recalibrated clutch actuation arm cam ratio, lever pull is actually lighter than before.
Third and fourth gear ratios are slightly taller, and third, fourth, and fifth gears are stronger than ever with new drive dog shapes for positive engagement. That gives riders a strong gearbox that’s been carefully matched to engine power characteristics.
Chassis/Suspension:
The Bilateral Beam frame is crafted from a carefully chosen combination of forged and extruded aluminum pieces – 20 in all – all welded together to provide unmatched rigidity balance.
The exhaust port shape has a “D” shape instead of round. This increases velocity through the port for excellent throttle response, while enhancing the power feeling of the engine.
The newly designed radiator is lower and further back and the oil tank is more compact and repositioned to achieve greater mass centralization.
The carburetor bore has a new venturi shape, plus there’s recalibrated jetting and a new accelerator pump. This translates to impressive response when the rider snaps open the throttle, and contributes to superb torquey low-to-midrange power characteristics.
The intake boot offers a straight, smooth tract for excellent engine breathing and more power. The airbox is reshaped to tuck neatly into the Bilateral Beam frame.
The exhaust pipe has been carefully tuned to optimize engine power, with a muffler that’s 50mm longer and with a narrower core – a design that lets the YZ250F comfortably meet the latest noise standards without sacrificing power.
Engineers were able to increase the clutch spring load for stronger engagement, yet, thanks to a recalibrated clutch actuation arm cam ratio, lever pull is actually lighter than before.
Third and fourth gear ratios are slightly taller, and third, fourth, and fifth gears are stronger than ever with new drive dog shapes for positive engagement. That gives riders a strong gearbox that’s been carefully matched to engine power characteristics.
Chassis/Suspension:
The Bilateral Beam frame is crafted from a carefully chosen combination of forged and extruded aluminum pieces – 20 in all – all welded together to provide unmatched rigidity balance.
The KYB® speed-sensitive front fork delivers exceptional damping feel, responsiveness, and bump absorption characteristics. Damping settings are revised, the piston rods have a new surface treatment, and the oil seal is a new design.
The 4-way-adjustable KYB® rear shock has been redesigned to make the most of the Bilateral Beam frame design. It’s lower in the frame for excellent mass centralization, and has new damping characteristics.
The new tank, seat, and rear fender are flat and the relationship between handlebars, pegs, and seat result in a natural, more forward riding position that facilitates rider movement. The fuel tank has been moved toward the center of the bike for mass centralization. The ProTaper® bars are four-way adjustable, and handlebar mounts and footpegs are 5mm higher to optimize rider position on the new chassis.
Additional Features:
The CDI unit has revised ignition mapping to match new engine intake and exhaust specs.
The 4-way-adjustable KYB® rear shock has been redesigned to make the most of the Bilateral Beam frame design. It’s lower in the frame for excellent mass centralization, and has new damping characteristics.
The new tank, seat, and rear fender are flat and the relationship between handlebars, pegs, and seat result in a natural, more forward riding position that facilitates rider movement. The fuel tank has been moved toward the center of the bike for mass centralization. The ProTaper® bars are four-way adjustable, and handlebar mounts and footpegs are 5mm higher to optimize rider position on the new chassis.
Additional Features:
The CDI unit has revised ignition mapping to match new engine intake and exhaust specs.
More Information Can Be Found On Yamaha At: https://www.yamaha-motor.com/
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