N° 8000A1730 (03-03)
A.6
ENGINE
Single-cylinder, two-stroke engine, with lamellar suction in the
crankcase and mechanical 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
3
/7.61 cu.in.
Compression ratio (with closed ports) ............................8,8:1
FUEL FEEDING
Intake setting by lamellar valve.
DISTRIBUTION DIAGRAM
TRANSFER: ................................................................128°
EXHAUST: .................................................................184°
Carburetor ........................................................Mikuni TMX 38
LUBRICATION
ENGINE
4% (1:25) of oil-gasoline mix (during running) NOT LESS than
3% (1:33)when running is over.
SHIFTING and MAIN TRANSMISSION
Through the oil contained in the engine block.
COOLING
With liquid circulation through a pump. Two radiators are pro-
vided in the thermal assembly front.
IGNITION
Capacity discharge electronic ignition with variable advance;
analogic for WR125, and digital for CR 125.
Make ................................................................KOKUSAN
Ignition advance (piston stroke before T.D.C.)
WR ..............................................1,2 mm/0.047 in.(15°)
CR ...........................................0,08 mm/0.0031 in. (4°)
Spark plug ........................ Champion QN 84 or NGK BR9 EG
Electrode gap .........................................0,6 mm/0.0236 in.
STARTING
Kick-start.
TRANSMISSION
Cluster constant-mesh gears.
Primary ratio ...........................................Z 22/71= 1:3,227
Gear ratios CR WR
1st ............................Z 14/33=1:2,357......Z 11/28=1:2,545
2nd............................Z 15/28=1:1,866......Z 14/28=1:2,000
3rd ............................Z 19/30=1:1,579......Z 16/27=1:1,687
4th ............................Z 20/27=1:1,350......Z 18/25=1:1,388
5th ............................Z 22/26=1:1,181......Z 19/23=1:1,210
6th ............................Z 21/21=1:1,000......Z 21/21=1:1,000
Finale drive ratio..........Z 13/50=1:3,846......Z 13/50=1:3,846
Gearing chain (CR 125)........REGINA 135 RX -5/8”x1/4”
or D.I.D. 520-DS 5/8”x1/4”
(WR 125) ................REGINA 135 ORN-A
or D.I.D. 520 V6
Total ratios CR WR
1st................................29,258 ......................31,596
2nd ..................................23,170 ......................24,825
3rd
..................................19,599 ......................20,946
4th
....................................16,757 ......................17,240
5th
....................................14,669 ......................15,026
6th
....................................12,412 ......................12,412
Oil-bath multi-disc clutch type.
BRAKES
Front brake
Perforated fixed hydraulic control and floating caliper.
Disc diameter ..........................................260 mm/10.23 in.
Brake caliper .........................................................BREMBO
Pad area............................................33,4 cm
2
/5.18 sq.in.
Rear brake
Perforated fixed disc hydraulic control and floating caliper.
Disc diameter ..........................................220 mm/8.661 in.
Brake caliper .........................................................BREMBO
Pad area............................................29,5 cm
2
/3.94 sq.in.
FRAME
Single beam with closed twin cell, made of high strenght stain-
less steel tubes. Made up o rectangular and square high tensile
steel tubes.
Steering angle .......................................................43° each
Steering axis angle.........................................................25°
Front fork caster...................................104 mm/4.1 in. (WR)
107 mm/4.21(WR)
SUSPENSIONS
Front suspension
Telescopic-hydraulic up-side down fork with led pin, adjustable
in compression and rebound.
Producer .........................................................MARZOCCHI
Legs diameter ..............................................45 mm/1.77 in.
Front wheel bulb position
(on the sliding axis) ....................................300 mm/11.8 in.
Rear suspension
Light alloy swinging fork with progressive leverage suspensions
(SOFT DAMP system) and hydraulic single-damper with helical
spring. The hydraulic brake compression (double), extension,
and the spring preload can be adjusted.
Damper make .........................................................SACHS
Rear wheel vertical travel ............................320 mm/12.6 in.
WHEELS
Light alloy front rim.
Manufacturer and type ...............................TAKASAGO Excel
Dimensions .........................................................1,60"x21"
Light alloy rear rim.
Manufacturer and type ...............................TAKASAGO Excel
Dimensions ........................2,15"x19" (CR); 2,15”x18” (WR)
TYRES
Front
Make .....................“Pirelli” (CR); “Michelin” or “Pirelli” (WR)
Type ........................................................51R-MT 32A (CR);
Enduro Competition 3 or MT83 Scorpion (WR)
Dimensions .....................80/100-21” (CR); 90/90-21” (WR)
Inflation pressure (cold):...........0,9÷1,0 Kg/cm
2
(12,8÷14,2 psi)
Rear
Make ...................... “Pirelli” (CR); “Michelin” or “Pirelli”(WR)
Type ................................................NHS (57) - MT 32 (CR);
Enduro Competition 3 or MT83 Scorpion (WR)
Dimensions ...................100/90-19” (CR); 120/90-18” (WR)
Inflation pressure (cold):...........0,8÷0,9 Kg/cm
2
(11,4÷12,8 psi)
GENERAL
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