Husqvarna 2006 SMS 125S, Workshop Manual, Page: 18 / 269

ENGINE
Single-cylinder two-stroke engine, with lamellar suction in the
crankcase and electronic control H.T.S. valve on the exhaust
system.
Bore ............................................................54 mm/2.12 in
Stroke.......................................................54,5 mm/2.14 in
Capacity .........................................124,82 cm
2
/7.61 cu.in
Compression ratio (with closed ports) .............................8,8:1
FUEL FEEDING
Intake setting by lamellar valve.
DISTRIBUTION DIAGRAM
TRANSFER: ...............................................................114°
EXHAUST: ...............................................................175°
Carburetor:
..........................................................Dell'Orto PHBH 28
LUBRICATION
ENGINE
By an automatic mixer.
SHIFTING and MAIN TRANSMISSION
Trough the oil contained in the engine block.
COOLING
Whit liquid circulation trough a pump. Two radiators are provi-
ded in the thermal assembly front.
IGNITION
Electronic.
Make ................................................................KOKUSAN
Ignition advance: ....1,5 mm 0.059 in. (piston stroke before T.D.C.
corresponding to 17° before T.D.C.)
Spark plug...........type “NGK” BR9 EG/“CHAMPION” QN 84
Electrode gap .........................................0,6 mm/0.0236 in.
STARTING
Kick-start.
TRASMISSION
Cluster constant-mesh gears.
Primary ratio ..........................................Z 22/72= 1:3,272
Gear ratios
1st ..........................................................Z 13/35=1:2,692
2nd ........................................................Z 15/27=1:1,800
3rd .........................................................Z 18/24=1:1,333
4th..........................................................Z 20/22=1:1,100
5th..........................................................Z 22/21=1:0,954
6th..........................................................Z 23/20=1:0,869
Final drive ratio
(wre ) ..............................Z 13/49=1:3,769
Final drive ratio (sms) ............................. Z 14/49=1:3,500
Gearing chain ..............REGINA 135 RX - 5/8” x 1/4”
or DID 520-DS-5/8” x 1/4”
Total ratios
1st........................................33,211 (wre) - 30,839 (sms)
2nd ......................................22,204 (wre) - 20,618 (sms)
3rd ......................................16,447 (wre) - 15,273 (sms)
4th ......................................13,569 (wre) - 12,600 (sms)
5th ......................................11,775 (wre) ) - 10,934 (sms)
6th ........................................10,727 (wre) - 9,960 (sms)
Clutch........................................oil-bath multi-disc clutch type
BRAKES
Front brake
Perforated fixed disc, with hydraulic control and floating caliper.
Disc diameter ...........................................260 mm/10.23 in
Brake caliper .........................................................BREMBO
Pad area.............................................................33,8 cm
2
/
5.24 sq.in
Rear brake
Perforated fixed disc, with hydraulic control and floating caliper.
Disc diameter ...........................................220 mm/8.661 in
Brake caliper .........................................................BREMBO
Pad area.............................................................33,5 cm
2
/
5.19 sq.in
FRAME
Double-cradle; rear frame. Made up of rectangular and square
high tensile steel tubes.
Steering angle....................................................45° for side
Steering axis angle ........................................................26°
Front fork caster..........................................104 mm/4.09 in
SUSPENSIONS
Front
Telescopic-hydraulic up-side down fork with led pin.
Producer .........................................................MARZOCCHI
Legs diameter .............................................40 mm/1.574 in
Front wheel bump position (on the sliding axis) ..........260 mm/
10.23 in
Rear
Steel swinging fork with progressive leverage suspensions
(SOFT DAMP system) and hydraulic single-damper with helical
spring. the spring preload can be adjusted.
Damper make............................SACHS
(wre) PAIOLI (sms)
Rear wheel vertical travel ................290 mm/11.41 in (wre)
282 mm/11.1 in. (sms)
WHEELS
Light alloy front rim.
Dimensions ..............................................1,60"x21" (wre)
Dimensions ..............................................2,75"x17" (sms)
Light alloy rear rim.
Dimensions ..............................................2,15"x18" (wre)
Dimensions ..............................................4,25"x17" (sms)
TYRES
Front
Manufacturer and type ......"DUNLOP" D 208-F (sms) “PIRELLI”
MT21 (wre)
Dimensions ............... 110/70-17" (sms) - 90/90-21” (wre)
Inflation pressure (in cold conditions):
driver only............................................1,2 Kg/cm
2
(17,1 psi)
with passanger......................................1,5 Kg/cm
2
(21,3 psi)
Rear
Manufacturer and type ..................."DUNLOP" D 207-TL (sms)
“PIRELLI” MT83 (wre)
Dimensions ..............150/60-17” (sms) - 120/90-18” (wre)
Inflation pressure (in cold conditions):
driver only............................................1,5 Kg/cm 2 (21,3 psi)
with passanger......................................1,8 Kg/cm
2
(25,6 psi)
GENERAL
8000 A7190 (03-06)
A.6
IMP. A 30-03-2006 10:37 Pagina 4
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