Seca 650 Specs and Info

Seca 650 Specifications from the November 1981 issue of "Cycle"
Model	Yamaha XJ650RJ
Price:(as of 8/25/81)	$3099
Standing start 1/4 mile	12.78 @ 105.38 mph
Engine rpm @ 60 mph, top gear	4480 rpm
Average fuel consumption rate	47 mpg
Cruise range (main/reserve)	185/52 miles
Load capacity	497.5 lbs
Maximum speed in gears(9500rpm)	(1) 47.3 (2) 69.0 (3) 89.7 (4) 110.9 (5)127.3
Engine
Type	Four stroke transverse four cylinder with dual overhead camshafts, chain driven
Bore and Stroke	63.0 x 52.4mm (2.48x2.06 in.)
Piston Displacement	653 cc
Compression ratio	9.2.1
Carburetion	(4) 32mm Hitachi constant velocity slide throttle.
Exhaust system	Four into two, interconnected
Ignition	Battery powered inductive, magnetically triggered with electronically controlled advance.
Air Filtration	Paper element, disposable
Oil Filtration	Paper element, disposable
Oil Capacity	3.5 liters (3.7 qts)
Transmission
Type	Five speed, constant mesh, multi plate wet clutch
Primary drive	Straight cut spur gear; 97/58; 1.672
Final Drive	Shaft; 49/36, 19/18, 32/11; 4.180
Gear ratios (overall)	(1) 15.29 (2) 10.48 (3) 8.06 (4) 6.52 (5)5.68
Chassis
Type	Full cradle tubular steel, twin downtube
Suspension	Front Telescopic coil spring, oil damped Rear Swing arm with (2) dampers; adjustable for preload
Wheelbase	1435 mm (56.5 in.)
Rake/Trail	27.75 degrees/115mm (4.53 in.)
Brakes	Front: Hydraulic twin disc, 268 mm (10.55 in.) rotors with single piston calipers Rear: Mechanical drum; rod activated
Wheels	Front Cast aluminum alloy 1.85 x 19 Rear Cast aluminum alloy 2.15 x 18
Tires	Front 3.25H x 19 Bridgestone Mag Mopus L-303 Rear 120/90H x 18 Bridgestone Mag Mopus S7-16
Seat Height	784 mm (30.86 in.)
Ground Clearance	149mm (5.86 in.)
Fuel Capacity, Main/Reserve	14.8/4.5 liters (3.9/1.2 gals.)
Electrical
Power	AC generator
Charge control	Solid state voltage regulator/ rectifier
Headlight Beams High/Low	60/55 watts
Tail/ stop lights	8/27 watts
Battery	12V 14AH
Instruments
Includes	Speedometer, Odometer Tripmeter, Tachometer with 9500 redline; indicators for high beam, neutral, low oil level and left/right turn indicator
Speedometer error	30 mph indicated 28.70 mph 60 mph indicated 59.13 mph

Submitted by Dave McCulloch

Specifications for the 1982 Seca 650 from Cycle World, April 1982
List price	$3099
Bore x Stroke	63 x 52.4mm
Displacement	653cc
Compression ratio	9.2:1
Carburetion	(4) 32mm Hitachi Constant Vacuum
Claimed power	N/A
Claimed torque	39.8 lb.-ft. @ 7500rpm
Oil capacity	3.7 qt.
Fuel capacity	5.2 gal.
Electrical power	266w alternator
Gear ratios, overall	(1) 15.29 (2) 10.48 (3) 8.06 (4) 6.52 (5) 5.68
Weight bias, % front/rear	47/53
GVWR	1000 lb.
Load capacity	511 lb.
Weight (w/half-tank fuel)	489 lb.
Performance (from Cycle World, April 1982)
Standing 1/4 mile	12.78 @ 103.68 mph
Top speed in 1/2 mile	117 mph
Fuel consumption	48 mpg.
Range (to reserve tank)	201 mi.
Acceleration:	0-30 mph.................................1.8 sec. 0-40 mph.................................2.7 sec. 0-50 mph.................................3.7 sec. 0-60 mph.................................4.8 sec. 0-70 mph.................................6.2 sec. 0-80 mph.................................7.5 sec. 0-90 mph.................................9.1 sec. 0-100 mph...............................11.5 sec.
Top gear acceleration:	40-60 mph...............................5.5 sec. 60-80 mph...............................7.8 sec.
Maximum speeds in gears:	1st............................................47 mph. 2nd...........................................69 mph. 3rd............................................89 mph. 4th............................................110 mph. 5th............................................127 mph.
Speedometer error:	30 mph. indicated...................29 mph. actual 60 mph. indicated...................59 mph. actual
Braking distance:	from 30 mph..................................32 ft. from 60 mph..................................138 ft.
Engine speed at 60 mph:	4500 rpm