High-Performance Unicam? cylinder head design (see Technology Section)

Lightweight, compact, internal auto decompression and handlebar-mounted hot-start system provide easy starting, hot or cold.

Compact, lightweight engine assembly weighs only 43.6 pounds.

Crankshaft is made of high-strength, low-carbon steel with carburized main journals for maximum durability at sustained high-rpm operation.

Forged 11.7:1-compression slipper piston and rings are lighter than a conventional design, revving quickly while maintaining excellent cylinder sealing and high-rpm power.

Double-carburized connecting rod utilizes a big-end needle bearing for maximum high-rpm performance and durability.

Nikasil cylinder lining is lightweight and provides cooler operation for extended engine life.

Press-fitted aluminum spark plug pipe fits between the two exhaust rocker arms, further contributing to compact cylinder-head design.

32mm Keihin FCR carburetor features four rollers on the flat slide, resulting in very light throttle effort, smooth operation, crisp throttle response and excellent rideability.

Carburetor features a throttle position sensor (TPS) that helps maintain a linear throttle response throughout the range.

Twin-sump lubrication system separates the oil supply for the crankshaft, piston and valve train from the clutch and transmission. This ensures a cool supply of oil to the clutch, eliminates potential clutch and transmission material contamination of the engine oil, reduces the amount of circulating oil and permits the use of a smaller oil pump.

Exhaust system uses a lightweight stainless exhaust header and repackable aluminum muffler.

Vertically split crankcases feature a built-in oil pump, reducing weight compared to a conventional design.

Dual radiators feature a refined core area for improved heat dissipation compared to conventional dual-radiator design.

Gear-driven balancer reduces vibration and drives the water pump. A six-disc clutch provides the surface area necessary to handle the engine’s impressive torque while carefully matched clutch springs provide a light feel at the lever.

Durable close-ratio five-speed transmission.


Front and rear suspension settings unique to the CRF?150R deliver ideal bump-absorption characteristics.

Handlebar bend optimizes rider position and comfort.

Lightweight, high-tensile steel frame with large-diameter frame tubing and cross-member provides excellent turning performance and straight-line tracking.

Box-section aluminum swingarm is lightweight and rigid.

Removable subframe is strong and durable.

37mm leading-axle inverted Showa cartridge front fork features friction-reducing design to improve compression and rebound control.

The fork offers adjustable compression and rebound settings.

Wide-section aluminum top and bottom triple-clamps position fork tubes far apart for good turning and control.

Tapered-roller steering-head bearings for durability.

Pro-Link? Rear Suspension (see Technology Section)

Strong, lightweight wheels are durable and minimize unsprung weight.

Lightweight front and rear disc brakes with high-performance pads offer powerful, precise braking.

Stout 15mm front and 17mm rear axles incorporate a surface-treatment for added strength and durability.

Additional Features

Large-capacity airbox and reusable two-stage foam air filter.

Lightweight plastic body components (radiator shroud, sidecovers, rear fender, seat base, fuel tank, front fender and front number plate) offer a slim, aggressive style.

Seat-cushion foam follows the shape of the fuel tank, providing a smooth transition to increase rider mobility and comfort.

Non-slip seat cover for increased rider control.

High-quality Dunlop tires.

HRC works-type rear-brake system integrates the rear master cylinder and fluid reservoir, eliminating the separate rear master-cylinder reservoir and hose.

Adjustable front-brake lever and master-cylinder assembly are the same as CR?125R/CR250R components.

Stainless-steel clutch cable for long life and improved feel and action.

Works-type handlebar grips add to rider comfort.

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