Yamaha YX600 Radian

From Wikipedia, the free encyclopedia
Jump to: navigation, search
YX600 Radian
Yamaha YX 600 Radian.jpg
Manufacturer Yamaha Motor Company
Parent company Yamaha
Production 1986 — 1990
Class Naked bike (standard)
Engine 598cc, air-cooled, DOHC, inline-4

The YX600 Radian is a sport/standard motorcycle manufactured by the Yamaha Motor Company between the years of 1986-1990. The Radian came equipped with a slightly detuned version of Yamaha's 598cc, air-cooled, inline-4 which was used in the Yamaha FZ-600 Sport Motorcycle (grandfather of Yamaha's FZR series of performance bikes), and initially designed with 528cc for the 1981 XJ550 Seca and Maxim then in 1984 the bore, stroke and carburetor size were increased for the Yamaha XJ600/FJ600 sport bike. In 1986 the engine was fitted with smaller 550 style carburetors to fit between the frame rails in the Japanese FZ400 chassis and introduced as the FZ600 which was produced until 1988.

The YX600 Radian chassis received less high performance components than its race-bred relatives in order to make the machine more affordable for the general riding community. Some of these features included twin rear shock absorbers, rear drum brakes, and the lack of performance fairings, lending the motorcycle's appearance to the increasingly popular "Naked bike" styling at the time.

Although the Radian's powerplant had slightly less top-end performance than its racing counterpart, the Yamaha FZ-600, it was noted that the machine's mild detuning contributed to a stronger mid-range powerband, and that the bike could pull away from an FZ model during short distance testing. Zero to 60mph acceleration tests of under four seconds are not uncommon with the YX600 Radian.


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 592 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


External links[edit]