2020 Yamaha YZ65 (2-Stroke)

• Powerful-feeling 65 cc liquid cooled, single-cylinder 2-stroke engine with Yamaha Power Valve System (YPVS)
• Crankcase reed valve
• 6-speed transmission with optimized gear ratios
• Semi-double-cradle steel frame, aluminum subframe

• 36mm inverted fork with 12 levels of compression and 10 levels of rebound damping for solid front-end feedback
• Monocross rear suspension with 10 levels of adjustment for both rebound and compression damping
• Newly designed aluminum swingarm
• Aluminum tapered handlebar with four positions of adjustability
• New seat for improved comfort, body weight transfer and easy maintenance
• 14-inch front and 12-inch rear wheel
• Styling based on high-end YZ models

Powerful-feeling 65 cc single-cylinder, liquid-cooled, 2-stroke engine with crankcase reed valve.

• Overall design creates excellent ride character and performance

Yamaha Power Valve System (YPVS).

• Mechanical power valve system delivers effective exhaust timing throughout the entire rev range
• Provides excellent power and torque characteristics
• Delivers responsive acceleration just as the rider intends
• Slit-shaped valve on the side of the exhaust port operates in response to engine rpm
• In low-to-mid-rpm range when exhaust timing is slower, valve moves to cover the top part of the exhaust port
• In high rpm range when quick exhaust timing is needed, valve recedes and exhaust port is fully uncovered
• Valve control governor from YZ125 and YZ250 employed

Newly-designed 2-petal reed valve.

Optimized crankshaft balance and lightweight connecting rod.

• Resin weight in crank web creates high primary compression ratio and optimal inertial mass
• Delivers instant power delivery and reduced vibration

New intake manifold and exhaust pipe.

• Optimal intake and exhaust layout complies with racing regulations
• Short exhaust produces rippling sound unique to a 2-stroke
• Expansion chamber designed for plenty of volume
• Design pays special attention to pulses that occur during combustion flow to contribute to explosive but easy-to-use power
• Exhaust complies with FIM/AMA regulations
• Optimized ignition output produces a stronger, more consistent spark throughout the entire rpm range

Newly-designed piston and piston rings.

High-voltage ignition coil.

• Optimized ignition output produces a stronger, more consistent spark throughout the entire rpm range

Model-specific CDI unit.

• Digital CDI system delivers precise spark and monitors engine speed to ensure optimal timing for excellent response

Short-type spark plug.

• Short design offers better service ability and performance

6-speed transmission with optimized gear ratios.

• Ideal number of clutch plates and spring load gives clutch lever a light pull
• Gear ratios fine-tuned for performance

Fine-tuned air cleaner box with revised shape and larger capacity (compared to YZ85).

Keihin PWK28 carburetor with revised settings (compared to YZ85).

Downsized radiator (compared to YZ85).

Drive chain with new dimensions (compared to YZ85).

• Gold colour contributes to bike's serious racing aesthetic

Semi-double-cradle steel frame and aluminum subframe.

• Dimensions, rigidity balance and synergy with suspension equals handling that feels light and stable, and willing to lean over in turns
• Lightweight, bolt-on aluminum subframe contributes to mass-centralization
• Inverted 36 mm KYB front fork with 215 mm (8.5 in) of wheel travel.

• Design combines handling with a light, stable feel and a solid connection to the ground
• 36 mm inner tubes ensure planted feeling when entering corners and excellent shock absorption when going over bumps
• Outer tubes made of aluminum alloy for excellent rigidity and front-end feel
• Adjustable compression (12 levels) and rebound (10 levels) damping to fine-tune handling and performance on the track
• Aluminum steering stem developed for rigidity balance

KYB link-less Monocross rear suspension with 270 mm (10.6 in) of wheel travel.

• Design provides smooth damping feel and doesn't bottom out when absorbing shocks
• Shock absorber has 10 levels of adjustment for both rebound and compression damping to fine-tune handling and performance

Aluminum swingarm.

• Rigidity balance is tuned for YZ65's frame, delivering light handling feel and easy lean-in characteristics
• Swingarm end designed with ease of maintenance in mind
• Resin chain guard designed not to get caught up in ruts that the small wheel will travel through

Tapered aluminum handlebar with 4-position adjustability.

• Handlebar adjusts 27 mm to match a child's growth
• Handlebar crown made of cast aluminum for light weight and strength

Seat designed for comfort and easy maintenance.

• Seat design facilitates body weight transfer for enhanced on-track performance and rider confidence
• Single bolt under the seat cushioning makes seat removal easier

Bodywork based on high-end YZ models.

• Body panels have a soft, gentle look
• Styling follows the YZ design language of horizontal lines
• Colours and graphics similar to the flagship YZ450F

Wave-style disc brakes.

• Sporty wave-style rotors are lighter than conventional rotors and offer improved self-cleaning action in dirty conditions

14-inch (front) and 12-inch (rear) blue Excel rims with Maxxis SI tires.

• Maxxis SI tires offer good grip across a variety of track conditions
• Blue Excel rims offer high quality and race-minded looks