First Look: 2010 Yamaha Two-Strokes 3

For those of you whose heart goes pitter-patter at the sound of a ring-ding-ding, and whose nose is as skilled as a sommelier when it comes to IDing which brand of oil is being run, your choices of bikes have gotten fairly slim. Yamaha still has a trio of bikes available for the pre-mix set, and while you might not find the level of innovation that you get with a 2010 YZ450F, they're all still awfully sweet examples of the latest in two-stroke technology...even if a bit frozen in time.

2010 Yamaha YZ85

Key Features:

• Liquid-cooled, 84.7cc crankcase reed-valve-inducted six-speed is light, compact and designed to deliver hard-hitting, moto-winning power throughout the rpm range.


• Ultra-rigid, single-backbone, semi-double-cradle frame is lightweight and strong for sharp handling.


• Fully adjustable suspension allows a broad adjustment range to suit everybody from rank novice to mini expert.

Engine:

• 84.7cc liquid-cooled, crankcase reed-valve-inducted, two-stroke engine inhales through a 28mm Keihin® flat-slide carburetor; seamless throttle response across the powerband is the result.


• Digital CDI ignition system puts out a more precise spark and monitors engine speed to ensure optimal timing for quicker, stronger response during hard acceleration.


• Smooth-shifting, six-speed close-ratio transmission with heavy-duty, multiplate clutch delivers maximum hookup for outstanding acceleration and corner-exiting power.


• Involute spline set-up in clutch means smoother shifting under power with great durability at competition-level usage.


• Two-piece clutch cover provides easy access during maintenance.


• Lightweight radiator has large cores and louvers, and the water pump features a cast aluminum (vs. resin) impeller for maximum cooling efficiency.


• Lightweight exhaust system design helps create a broader powerband with stronger low-end punch.


• Airbox design ensures greater air cleaning performance and easier maintenance.

Chassis/Suspension:

• Rear subframe is removable to allow easy maintenance.


• Lightweight 36mm KYB® inverted cartridge fork features 10.8 inches of travel with compression and rebound damping adjustability, and low-friction outer tubes and internals.


• Rear suspension features fully adjustable Kayaba link-type shock with 11.1 inches of travel and race-tested compression damping valving.


• 220mm front disc and 190mm rear disc brakes with stainless steel rotors deliver strong, precise stopping power.


• Lightweight 17-inch front and 14-inch rear rims are durable and reduce unsprung weight for optimal suspension performance.


• Dunlop® knobbies provide great traction on a variety of tracks and terrain.

Additional Features:

• Wide handlebar and flat fuel tank, radiator shrouds, side panels and rear fender provide rider with leverage and freedom of movement and weight transfer.


• Wide footpegs provide superb comfort, grip and ground clearance.


• Separate clutch cover with transmission oil filler opening makes for easy maintenance.


• Fuel tank cap is wider-diameter for easier usage, and large tank opening ensures fast, hassle-free refueling.


• Repackable exhaust silencer.

Specifications

MSRP*: $3,690 (Team Yamaha Blue/White) Available from February 2010

EngineType: 84.7cc liquid-cooled 2-stroke; reed-valve inducted

Bore x Stroke: 47.5 x 47.8mm

Compression Ratio: 8.2:1

Fuel Delivery: Keihin® PWK 28

Ignition: CDI

Transmission: Constant-mesh 6-speed; multiplate wet clutch

Final Drive: Chain Drive

Chassis

Suspension/Front: Inverted fork; fully adjustable, 10.8-in travel

Suspension/Rear: Single shock; fully adjustable, 11.1-in travel

Brakes/Front: Hydraulic single disc brake, 220mm

Brakes/Rear: Hydraulic single disc brake, 190mm

Tires/Front: 70/100-17-40M

Tires/Rear: 90/100-14-49M

Dimensions

Length: 71.7 in

Width: 30.9 in

Height: 45.7 in

Seat Height: 34.0 in

Wheelbase: 49.5 in

Ground Clearance: 13.8 in

Fuel Capacity: 1.3 gal

Wet Weight: 156 lb

Other

Warranty: 30 Day (Limited Factory Warranty)

2010 Yamaha YZ125

Key Features:

• A light aluminum frame housing an amazingly light and compact engine results in an awesome power-to-weight ratio.


• The YZ125 is ready to race out of the crate, complete with a ProTaper® aluminum handlebar, titanium footpegs and gripper seat.


• A pure motocross machine, the light and nimble YZ125 is the perfect choice for riders stepping up from the 85cc class.

Engine:

• Reed-valve spacer improves acceleration across the entire powerband.


• Amazingly compact 124cc reed-valve-inducted two-stroke helps produce an awesome power-to-weight ratio.


• Patented YPVS® power-valve system combines crisp, hard-hitting bottom-end acceleration with strong midrange and eye-opening top-end.


• 38mm Mikuni® TMX carburetor gives excellent throttle response and serious horsepower.


• Six-speed, close-ratio transmission optimizes gear ratios for maximum performance.


• Digital CDI ignition system delivers precise spark and monitors engine speed to ensure optimal timing for faster, stronger response during hard acceleration.


• Large-capacity radiator features a 10-row core with four louvers to deliver maximum cooling efficiency at all performance levels.


• Primary kickstarting ensures easy restarts in any gear.


• Trick, works-style clutch lever features race-spec barrel adjuster for on-the-fly adjustability.

Chassis/Suspension:

• YZ250F-style front-brake caliper and wave-style front and rear discs minimize unsprung weight and provide excellent stopping power.


• A carefully engineered, advanced aluminum frame and swingarm give the YZ125 the best handling in its class.


• Speed-Sensitive System 48mm KYB® fork; damping force is controlled by piston speed which provides a smoother, more precise ride.


• Removable aluminum rear subframe is constructed of square-section tubing for reduced weight.


• Rear, fully adjustable KYB® shock features a super-light titanium shock spring and reduced-friction Kashima coating of internals. 12.4 inches of travel, separate adjusters for high- and low-speed compression damping, and a full lock oil rebound system for increased comfort all add up to fantastic rear wheel control and a sweet ride.


• Tapered rear wheel spacers ease sliding the rear wheel into place for quicker tire changes.


• Premium Dunlop® knobbies offer race-spec traction and wear.

Additional Features:

• Special-design “gripper” type seat and fuel tank, forward-canted steering crown and low ProTaper® handlebar all help create greater freedom of movement and more comfortable ergonomics for riders.


• Wide, cleated, folding titanium footpegs are lightweight and provide excellent comfort, grip and ground clearance.


• Use of light box-head bolts throughout the chassis eases maintenance while reducing weight for increased performance.


• Premium drive chain has gold-colored plates for outstanding looks.


• Wide-diameter fuel tank cap for easier refueling.


• Repackable exhaust silencer.


• Durable, comfortable handlebar grips.

Specifications
MSRP*: $6,090 (Team Yamaha Blue/White) Available from February 2010

Engine Type: 124cc, liquid-cooled, 2-stroke, reed-valve inducted

Bore x Stroke: 54.0 x 54.5mm

Compression Ratio: 8.6~10.7:1

Fuel Delivery: Mikuni® TMX 38

Ignition: CDI

Transmission: Constant-mesh 6-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; 12.4-in travel

Brakes/Front: Hydraulic single disc brake, 250mm

Brakes/Rear: Hydraulic single disc brake, 245mm

Tires/Front: 80/100-21-51M

Tires/Rear: 100/90-19-57M

Dimensions
Length: 84.1 in

Width: 32.6 in

Height: 51.8 in

Seat Height: 39.3 in

Wheelbase: 56.8 in

Ground Clearance: 15.2 in

Fuel Capacity: 2.1 gal

Wet Weight: 208 lb

Other
Warranty: 30 Day (Limited Factory Warranty)

2010 Yamaha YZ250

Key Features:

• Our legendary two-stroke Supercross winner is more potent than ever.


• A light aluminum frame housing a patented YPVS® Power valve-equipped ripper of an engine results in an awesome power-to-weight ratio.


• The YZ250 is ready to race out of the crate, complete with a ProTaper® aluminum handlebar, titanium footpegs, gripper seat and Excel rims.

Engine:

• 249cc liquid-cooled reed-valve-inducted two-stroke engine is lightweight, compact and features an incredibly wide, hard-hitting powerband.


• Patented YPVS® power-valve system combines crisp, hard-hitting, bottom-end acceleration with strong midrange and eye-opening top-end.


• Special-design carbon fiber reed-valve petals improve throttle response and engine performance across the entire rpm range.


• Smooth-shifting, five-speed, close-ratio transmission with heavy-duty, multiplate clutch.


• Primary kickstarter ensures smooth, easy starting action and reduced weight.


• Large-capacity radiator features a ten-row core with four louvers for maximum cooling efficiency.


• 38mm Keihin® PWK carburetor with power jet and throttle position sensor (TPS) ensures precise fuel/air mixing and extra-crisp throttle response throughout the powerband.


• Digital CDI ignition system delivers precise spark for faster, stronger response anywhere in the powerband.


• Trick, works-style clutch lever features race-spec barrel adjuster for on-the-fly adjustability.

Chassis/Suspension:

• YZ250F-style front-brake caliper and wave-style front and rear discs minimize unsprung weight and provide excellent stopping power.


• The KYB® 48mm forks feature the Speed-Sensitive System that uses piston speed to control damping force for super-precise handling and a smooth ride.


• A carefully engineered, advanced aluminum frame and swingarm give the YZ250 the best handling in the 250 class.


• Removable aluminum rear subframe is constructed of square-section tubing for reduced weight.


• Rear, fully adjustable KYB® shock features a super-light titanium shock spring and reduced-friction Kashima coating of internals. 12.4 inches of travel, separate adjusters for high- and low-speed compression damping, and a full lock oil rebound system for increased comfort all add up to fantastic rear wheel control and a sweet ride.


• Lightweight 21-inch front and 19-inch rear Excel rims provide exceptional durability and help reduce unsprung weight for optimal suspension, performance and handling.


• Tapered rear wheel spacers ease sliding the rear wheel into place for quicker tire changes.


• Premium Dunlop® knobbies offer race-spec traction and wear.

Additional Features:

• Wide, cleated, folding titanium footpegs are lightweight and provide excellent comfort, grip and ground clearance.


• Special-design “gripper” type seat and fuel tank, forward-canted steering crown and low handlebar provide excellent movement and more comfortable ergonomics for riders.


• Wide-diameter fuel tank cap ensures easier usage, while larger tank opening means faster, hassle-free refueling.


• A light and strong ProTaper® aluminum handlebar in adjustable mounts means comfort and control.


• Premium drive chain has gold-colored plates for outstanding looks.


• Use of light box-head bolts throughout the chassis eases maintenance while reducing weight and increasing performance.


• Repackable exhaust silencer.


• Durable, comfortable handlebar grips.

Specifications

MSRP*: $6,990 (Team Yamaha Blue/White) Available from February 2010

Engine Type: 249cc liquid-cooled 2-stroke; reed-valve inducted

Bore x Stroke: 66.4 x 72.0mm

Compression Ratio: 9.2 – 10.9:1

Fuel Delivery: Keihin® PWK38S

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, 12.4-in travel

Brakes/Front: Hydraulic single disc brake, 250mm

Brakes/Rear: Hydraulic single disc brake, 245mm

Tires/Front: 80/100-21-51M

Tires/Rear: 110/90-19-62M

Dimensions

Length: 85.7 in

Width: 32.6 in

Height: 51.4 in

Seat Height: 39.1 in

Wheelbase: 58.3 in

Ground Clearance: 15.0 in

Fuel Capacity: 2.1 gal

Wet Weight: 229 lb

Other

Warranty: 30 Day (Limited Factory Warranty)