News Releases 2002

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March 20, 2002

Honda Releases Sporty New Dio Z4 50cc Scooter

Tokyo, March 20, 2002-Honda Motor Co., Ltd. today introduced the sporty, stylish Dio Z4, a new addition to the environment-friendly Dio lineup of water-cooled, 4-stroke 50cc scooters. The Dio Z4 goes on sale Thursday, March 21, 2002.

The 4-stroke Dio series, released in March 2001, was developed around the keywords "Clean", "Economical", "Silent", and "Tough". These scooters have won a broad following not only for their environmental performance, but also for their comfortable ride and fuel economy.

This latest scooter in the series adopts a sporty exterior design built on the Dio base. The new large rear spoiler incorporates a built-in red LED high-mount brake light, for a sharply styled rear view. The headlight employs a blue multi-reflector that imparts a racy feel.

Lightweight aluminum-cast wheels front and rear are paired with a front disc brake to deliver sporty handling and nimble response.

Two body colors are available: intrepid Clear Silver Metallic and eye-catching Clipper Yellow.

Dio Z4

Dio Z4

  • Yearly domestic sales target:8,000 units
  • Manufacturer’s suggested retail price  (excl. consumption tax):189,000 yen
    (Example of regionally adjusted manufacturer's suggested retail price: Okinawa +5,000 yen. The manufacturer's suggested retail price is for reference only. Similar adjustments may be made in other regions.)

=Distinctive Features=

  • A water-cooled, 4-stroke engine delivers superb environmental performance
    Dio’s efficient, clean-burning engine emits only half the carbon monoxide (CO) and hydrocarbons (HC) allowed under government regulations*1, while attaining superb fuel economy of 75.0km/L*2. It also delivers high durability and low running and startup noise.
    *1 Honda in-house testing
    *2  Test value for low-altitude operation at 30km/h
  • Sporty styling with a racy feel
    The Dio Z4’s exterior design is loaded with sporty styling from tip to tail. The headlight employs a blue vapor-deposit aluminum coating inside the multi-reflector, for superb illumination and a racy look. The large rear spoiler incorporates a built-in red LED high-mount brake light, with a sharp, upswept design for the brake and turn signal lights. The “4” of the Z4’s 3-dimensional emblem is highlighted in red, for a further touch of presence and flair.
  • High-performance wheels and brakes
    A front disc brake and lightweight aluminum-cast wheels front and rear deliver sporty handling and nimble response.
  • A high-security anti-theft system
    For added security, the Z4 provides single-key operation for the main switch, seat opener, and reinforced handle-lock system, all from the main key cylinder. The main key cylinder also features a key shutter. Honda’s original “Lock In” center-stand locking system, an antihotwiring circuit, and locking fuel cap further improve vehicle security, for solid anti-theft protection.
  • Other main features
    ・Combi-braking system that simultaneously activates both front and rear brakes for enhanced stability while braking
    ・An extra-large 22L* storage space with plenty of room for a full-face helmet or A4-size files
    ・Gold-colored wheels for an elegant, stylish look
    *Honda in-house measurement

=Body colors=
·Clear Silver Metallic
·Clipper Yellow
Where the name "Dio Z4" comes from:
The Z4 name combines the "ZX" of the Dio ZX-a sporty scooter released in 1992 that is popular among young people-with the "4" of the 4-stroke engine employed in the Dio series, positioning the Z4 as the sporty model in the Dio series.


Vehicle Name Dio Z4
Vehicle Type Honda BA-AF57
Length x Width x Height (m) 1.710×0.620×1.010
Wheelbase (m) 1.190
Ground Clearance (m) 0.115
Seat Height (m) 0.710
Curb Weight (kg) 77
Dry Weight (kg) 72
No. of Riders 1.8
Turning Radius (m) 2.8
Engine Type AF55E(water-cooled, 4-stroke OHC one-cylinder)
Engine Displacement (cm3) 49
Bore x Stroke (mm) 38.0×44.0
Compression Ratio 12.0
Maximum Power (kW[PS]/rpm) 3.7[5.0]/8,000
Maximum Torque (N·m[kg·m]/rpm) 4.6[0.47]/7,000
Fuel Consumption (km/L) 75.0 (30km/h constant speed, low altitude)
Carburetor Type NVK00A
Starter Cell-type (with back-up kick start)
Ignition CDI, battery-powered
Lubrication Force-fed and splash
Oil Capacity L 0.7
Fuel Capacity L 5.0
Clutch Dry, multi-plate shoe-type
Gear Ratio 1st Gear 2.800 ~ 0.860
Caster Angle (degrees)/Trail (mm) 26°30´/72
Tire Size Front 90/90-10 50J
Rear 90/90-10 50J
Braking System Front Hydraulic disc
Rear Mechanical, leading/trailing drum-type
Suspension Front Telescopic-type
Rear Unit swing-type
Frame Construction Underbone (aluminum frame)