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Suzuki K50 specifications

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 k Plug cap — Ground
Magneto coil resistance

Lightning

0.5 ± 20% Yellow — Ground
Charging 1.3 ± 20% B/R — Ground
Primary 115.4 ± 20%  
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 type: Air-cooled single-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 type: 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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