TECH SPECS
BIKE:SM125S
Specification
Dimensions, weight, capacities

Wheelbase                mm/in                1470 / 57.87

Overall length             mm/in                2210 / 87

Overall width              mm/in                825 / 32.48

Overall height             mm/in                1175 / 46.26

Saddle height             mm/in                870 / 34.25

Min. ground clearance mm/in                265 / 10.43

Trail                            mm/in                104 / 4.1

Dry weight                Kg/lb                113,5 / 250.2

Fuel tank capacity                 10,2

U.S. Gallons                         2.69

Imp. Gallons                         2.24

Transmission oil                    0,65

U.S. Quarts                           0,69

Imp. Quarts                           0,57

Engine Characteristics - Type Single cylinder, two stroke

Bore       mm/in                54 / 2.12

Stroke    mm/in                54,5 / 2.14

Displacement cm/cu.in 124,82 / 7.61

Compression ratio (at closed port)        8,8:1

Starting Kick-starter

Cooling By liquid Water radiator No.2

Timing system

Type Reed valve in the crankcase and “H.T.S.” valve with electronic control on the exhaust port

Valve timing

Exhaust               175°

Intake                  Reed valve

Transfer               114°

Lubrication - Engine by an automatic mixer

Transmission - primary drive by the oil contained in the crankcase

 Ignition - Type C.D.I. electronic, analogic type, with adjustable advance

Spark plug type "CHAMPION" QN84/"NGK" BR 9EG

Spark plug gap                mm/in 0,6 / 0.024

Fuel system - Carburetor manufacturer and type “DELL’ORTO” PHBH 28 BS

Venturi diameter mm/in    28 / 1.1

Clutch Type Wet, multiplate type; mechanic control

Driving disc no 7

Driven disc no 6

Primary drive

Engine sprocket Teeth 22

Clutch gear Teeth 72

Transmission ratio 3.272

Transmission - Type Constant mesh gear type

Speed gears no 6

Internal ratios

1st          2,692 (35/13)

2nd         1,800 (27/15)

3rd          1,333 (24/18)

4th          1,100 (22/20)

5th          0,954 (21,22)

6th 0,869 (20/23)

Secondary drive

Transmission sprocket Teeth 14

Rear wheel sprocket Teeth 49

Transmission ratio 3,500

Driving chain - Manufacturer and type REGINA" 135RX-5/8"x1/4";.“D.I.D.” 520 DS-5/8"X1/4"

Overall ratios

1st . . . . . . . . . .30,839

2nd . . . . . . . . . .20,618

3rd . . . . . . . . . .15,273

4th . . . . . . . . . .12,600

5th . . . . . . . . . .10,934

6th . . . . . . . . . . .9,960

Chassis

Frame

Type - Double tube cradle with steel round tubes; rear frame with steel square tubes

Front suspension Type "Upside-Down" telescopic hydraulic fork with advanced axle

Fork legs dia                mm/in                40 / 1.57

Travel on legs axis mm/in                260 / 10.24

Front fork manufacturer                "MARZOCCHI"

Rear suspension Type Progressive "Soft Damp" type with single hydraulic shock absorber; spring preload adjustment

Wheel travel mm/in    282 / 11.1

Shock absorber manufacturer                "PAIOLI" - "SACHS"

Front brake

Type “BREMBO", disc type with floating caliper

Disc dia mm/in                260 / 10.24

Rear brake

Type "BREMBO", disc type with floating caliper

Disc dia mm/in                220 / 8.66

Front rim Material Light alloy

Size                 3,50"x17"

Rear rim Material Light alloy

Size                 4,25"x17"

Front tire

Type  "PIRELLII" MT R01 DRAGON

Size        120/70 - 17"

Rear tire

Type "PIRELLII" MT R01 DRAGON

Size 150/60 - 17"

Electrical equipment

Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 12 V

Lamps wattage

Head light . . . . . . . . . . . . . . . . . . . . . . . . 55/60 W

Pilot light . . . . . . . . . . . . . . . . . . . . . . . . . 3 W

Tail light . . . . . . . . . . . . . . . . . . . . . . . . . .5 W

Stop light . . . . . . . . . . . . . . . . . . . . . . . . . 21 W

Turn signals . . . . . . . . . . . . . . . . . . . . . . .10 W

Instruments light . . . . . . . . . . . . . . . . . . . .2 W

Warning light . . . . . . . . . . . . . . . . . . . . . . 1,2/2 W

Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 V - 3 Ah