Suzuki K50 numbers

I have put collected some K 50 technical data on this page. The page is still under construction. I would be grateful of any contributions — sales brochures, magazine ads, magazine articles, pictures, specs, facts, corrections etc. Please scan the material in JPEG format (large enough that all the details are visible) and send them to me. Please tell me the source and the publication date if possible. If you send me pictures of your own bike, please follow these instructions.

Here follows some technical data from a Suzuki K50 service book, Swedish edition. Unfortunately I'm not sure about the year. I only have a four-page Xerox copy of the book. The bike picture on the cover page looks like a 1986-year's model to me. I also have a Swedish model wiring diagram if somebody needs it.

CARBURETOR

Item	Specification
Carburetor type	Mikuni VM10SC
Bore size	10 mm
I.D. No.	22615
Idle rpm	1,400 ± 150
Float height	24.0 ± 0.5 mm
Main jet	#62.5
Main air jet	2 mm
Jet needle	3F3-2nd
Needle jet	E-3
Cut-away	2.5
Pilot jet	#17.5
Pilot outlet	0.9 mm
Air srew	1 turn back
Strater jet	#40
Throttle cable play	0.5—1.0 mm
Choke cable play	0.5—1.0 mm

ELECTRICAL

Item	Specification		Note
Ignition timing	20° ± 3° B.T.D.C. at 6,000 rpm
Spark plug	Type	N.D.: W22FP NGK: BP7HS
	Gap	0.6—0.8
Spark performance	Over 8 at 1 atm.
Ignition coil resistance	Secondary	4—8 ký	Plug cap — Ground
Magneto coil resistance	Lightning	0.5 ± 20% ý	Yellow — Ground
	Charging	1.3 ± 20% ý	B/R — Ground
	Primary	115.4 ± 20% ý
Charging rate	Day	Above 1.0 A at 4,000 rpm	With fully charged battery
	Night	Below 1.1 A at 4,000 rpm
Lightning coil output	Above 5 V at 2,500 rpm Below 8 V at 8,000 rpm		With ignition switch positioned in night
Regulated voltage	7.00 ± 0.35 V at 5,000 rpm
Battery	Type designation	6N4-2A
	Capacity	6V 14.4 kC (4 Ah)/10 HR
	Standard electrolyte S.G.	1.26 at 20°C (68°F)
Fuse size	10 A

WATTAGE

Item	Specification
Headlight	15
Tail/Brake light	5/21
Turn signal light	21
Speedometer light	1.7
Turn signal indicator light	1.7
Neutral indicator light	1.7

TIRE PRESSURE

Cold inflation tire pressure	Solo riding		Dual riding
	kPa	kg/cm2	kPa	kg/cm2
FRONT	175	1.75	175	1.75
REAR	200	2.00	225	2.25

FUEL + OIL

Item	Specification
Fuel type	Gasoline should be graded 85—95 octane or higher. An unleaded or low-lead type gasoline is recommended.
Fuel tank including reserve	6.5 L
Fuel tank reserve	1.5 L
Engine oil type	CCI or CCI super
Engine oil tank capacity	1.2 L
Transmission oil type	SAE 20W/40
Transmission oil capacity	Change	500 ml
	Overhaul	550 ml
Front fork oil type	Fork oil #10
Front fork oil capacity	70 ml (each leg)

DRIVE CHAIN

Item	Standard			Limit
Drive chain	Type		D.I.D.: 420 Takasago: PK420M	—
	Links		104	—
	20-pitch length		—	259.0
Drive chain slack	10—15			—

ENGINE

Item	N·m	kg-m	lb-ft
Cylinder head nuts	6—10	0.6—1.0	4.5—7.0
Flywheel rotor nut	30—40	3.0—4.0	21.5—29.0
Engine sprocket nut	30—50	3.0—5.0	21.5—36.0
Clutch sleeve hub nut	40—60	4.0—6.0	29.0—43.5
Primary drive gear nut	60—80	6.0—8.0	43.5—58.0
Engine mounting nuts (8 mm)	13—23	1.3—2.3	9.5—16.5

CHASSIS

Item	N·m	kg-m	lb-ft
Handlebar fitting blots	12—20	1-2—2.0	8.5—14.5
Steering stem head bolt	35—55	3.5—5.5	25.5—40.0
Front fork cap bolts	35—55	3.5—5.5	25.5—40.0
Sttering stem lower clamp bolts	20—30	2.0·3.0	14.5—21.5
Caliper bolts	15—25	1.5—2.5	11.0—18.0
Front axle nut	27—43	2.7—4.3	19.5—31.0
Front brake disc bolts	15—25	1.5—2.5	11.0—18.0
Front footrest bolts	10—15	1.0—1.5	7.0—11.0
Rear shock absorber fitting nuts	20—30	2.0·3.0	14.5—21.5
Rear swinging arm pivot nuts	25—40	2.5—4.0	28.9—29.0
Rear axle nut	36—52	3.6—5.2	26.0—37.5
Rear torque link nuts	10—15	1.0—1.5	7.0—11.0
Rear brake cam lever nut	5—8	0.5—0.8	3.5—6.0

1979 K50 specifications (Japan)

Overall Length: 1 815 mm (71.5 in)
Overall Width: 750 mm (29.5 in)
Overall Height: 990 mm (39.0 in)
Seat Height: 755 mm (29.7 in)
Wheelbase: 1 190 mm (46.9 in)
Ground Clearance: 135 mm (5.3 in)
Dry Weight: 72 kg (158 lbs)
Engine: Air-cooled 1-cylinder 2-stroke, reed valve.
Cylinder volume: 49 cc
Power Output: 4.5 hp/ 7.000 rpm
Torque: 0.52 kg-m/ 5.000 rpm
Bore x Stroke: 41 x 37,8 mm
Compression Ratio: 6,9:1
Starting system: kickstart
Lubricating System: wet sump
Transmission: 4 speed rotary
Front Brakes: drum
Rear brakes: drum
Front Tyre: 2.25-17
Rear Tyre: Tyre 2.25-17
Retail Price in Japan 1979: 106,000 Yen



2002 K50 specifications (Japan)

Model code: BB-BA15A
Overall Length: 1 815 mm (71.5 in)
Overall Width: 750 mm (29.5 in)
Overall Height: 1 010 mm (39.8 in)
Seat Height: 755 mm (29.7 in)
Wheelbase: 1 190 mm (46.9 in)
Ground Clearance: 135 mm (5.3 in)
Dry Weight: 73 kg (161 lbs)
Engine: Air-cooled single cylinder 2-stroke
Cylinder volume: 49 cc
Power Output: 4.5 hp (3.3 kW)/ 6.500 rpm
Torque: 5,4 Nm (0,5 kg-m)/ 5.000 rpm
Bore x Stroke: 41 x 37,8 mm
Compression Ratio: 6,6:1
Starting system: kickstart
Lubricating System: wet sump
Transmission: 4 speed rotary
Front Brakes: drum
Rear brakes: drum
Front Tyre: 2.25-17 33L
Rear Tyre: Tyre 2.25-17 33L
Fuel Tank Capacity: 6,5 liter
Reserve: 1,2 liter
Retail Price in Japan 2002: 179,000 Yen






More: Suzuki K series

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Sources: Suzuki Motor Company etc.

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