Yamaha YX600 Radian

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YX600 Radian
1987 Yamaha Radian YX600.jpg
ManufacturerYamaha Motor Company
Parent companyYamaha
Production1986 — 1990
ClassNaked bike (standard)
Engine598cc, air-cooled, DOHC, inline-4

The YX600 Radian was a standard-style motorcycle with a 599cc, air-cooled, inline-4 engine. Manufactured by the Yamaha Motor Company between 1986 and 1990, its engine is based on the Yamaha XJ600 (known as the FJ600 in North America).

The Radian was designed to be an affordable, simple, and reliable motorcycle. It's a good bike for beginners due to its low seat height, friendly power delivery, and active rider community.[1]


Overall length 2,075 mm (81.7 in)
Overall width 770 mm (30.3 in)
Overall height 1,095 mm (43.1 in)
Weight (with oil and fuel) 197 kg (434 lb)
Engine type air-cooled 4-stroke, gasoline, DOHC
Model 1UJ (YX600S), 1UL (YX600SC)
Cylinder arrangement parallel, 4-cylinder, forward inclined
Displacement 599 cc
Bore x Stroke 58.5 x 55.7 mm (2.3 x 2.2 in)
Compression ratio 10.0 : 1
Starting system electric starter
Lubrication system Wet sump
Engine oil type SAE 20W40 type SE motor oil (if temperature does not go below 5°C/40°F); SAE 10W30 type SE motor oil (if temperature does not go above 15°C/60°F)
Engine oil capacity (total amount) 2.9 L (2.5 Imp qt, 3.1 US qt)
Air filter Dry type element
Fuel type Regular gasoline
Fuel tank capacity 12 L (2.6 Imp gal, 3.2 US gal)
Fuel reserve amount 2.5 L (0.5 Imp gal, 0.7 US gal)
Carburetor type/manufacturer BS30 x 4/MIKUNI
Spark plug type/manufacturer D8EA (NGK) or X24ESU (NIPPON DENSO)
Spark plug gap 0.6 ~ 0.7 mm (0.024 ~ 0.028 in)
Clutch type Wet, multi-disc
Transmission - Primary reduction system Chain, Gear
Transmission - Primary reduction ratio 22/21 x 65/28 (2.431)
Transmission - Secondary reduction system Chain drive
Transmission - Secondary reduction ratio 45/16 (2.812)
Transmission type Constant mesh 6-speed
Gear ratio (1st) 41/15 (2.733)
Gear ratio (2nd) 37/19 (1.947)
Gear ratio (3rd) 34/22 (1.545)
Gear ratio (4th) 31/25 (1.240)
Gear ratio (5th) 29/28 (1.035)
Gear ratio (6th) 27/30 (0.900)
Frame type Double cradle
Caster angle 27°
Trail 128 mm (5.04 in)
Tire size (front) 110/90-16-59H
Tire size (rear) 130/90-16 67H
Brake type (front) Dual, disk brake
Brake type (rear) Drum brake
Suspension (front) Telescopic fork
Suspension (rear) Swing arm
Shock absorber (front) Coil spring, oil damper
Shock absorber (rear) Coil spring, oil damper
Wheel travel (front) 140 mm (5.5 in)
Wheel travel (rear) 98 mm (3.9 in)
Ignition system TCI
Generator system AC generator
Battery type/capacity 12N 12A-4A/12V 12AH


  1. The Radian Yahoo! Group founded in 1999, is an active mailing list for discussing all things related to the Yamaha YX600 Radian motorcycle.
  2. These specifications are from the YX600 Owner's Manual.