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ENGINE
Single-cylinder, two-stroke engine, with lamellar suction and
mechanical control H.T.S. valve on the exhaust system.
Bore (250) ...............................................66,4 mm/2.61 in.
Bore (300) ..................................................72 mm/2.83 in.
Stroke (250) ................................................72 mm/2,83 in.
Stroke (300) ................................................72 mm/2.83 in.
Capacity (250) ....................................249,3 cm
Capacity (300) ....................................293,1 cm
Compression ratio (with closed ports) (250)......................8,4:1
Compression ratio (with closed ports) (300)......................6,9:1
FUEL FEEDING
Intake setting by lamellar valve.
PORT TIMING
TRANSFER: ................................................................116°
EXHAUST: .................................................................184°
Carburetor: ...........................................................Mikuni TMX 38
LUBRICATION
ENGINE
3% of oil-gasoline mix (during running) NOT LESS than 2%
when running is over.
SHIFTING and MAIN TRANSMISSION: Through the oil contai-
ned 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 start with variable advance.
Manufacturer .....................................................KOKUSAN
Ignition advance
(piston stroke before T.D.C.) ...............0,5 mm/0.0197 in. (8°)
Spark plug make and type: .................."NGK" BR8 EG (250);
Electrode gap.......................0,6÷0,7 mm/0.0236÷0.0275 in.
STARTING
Kick-start.
TRANSMISSION
Cluster constant-mesh gears.
Primary ratio ...........................................Z 27/69= 1:2,555
Gear ratios
1
st
Z 14/30=1:2,142
2
Z 16/28=1:1,750
nd
3
Z 16/23=1:1,437
rd
4
Z 19/23=1:1,210
th
5
Z 19/20=1:1,053
th
Final drive ratio (250) ...............................Z13/48= 1:3,692
Final drive ratio (300) ..............................Z14/50= 1:3,571
Gearing chain ................................... REGINA 135 ORN-A
Total ratios
250
1ª
....20,220
2ª
....16,513
3ª
....13,564
4ª
....11,422
5ª ......9,932
Oil-bath multi-disc clutch type.
A.6
3
/15.21 cu.in.
/17.87 cu.in.
3
or D.I.D. 520-V6(OR), 5/8"x1/4"
300
19,558
15,972
13,120
11,048
9,607
GENERAL
FRAME
Double cradle; rear frame. Made up of rectangular and square
high tensile steel tubes.
Steering angle .......................................................45° each
Steering axis angle.........................................................26°
Front fork caster ........................................114 mm/4.49 in.)
SUSPENSIONS
Front suspension
Telescopic-hydraulic up-side down fork with led pin, adjustable
in compression and rebound.
Manufacturer Kayaba (2010) .................MARZOCCHI (2009)
Legs diameter 48 mm/1.89 in (2010)- 50 mm/1.97 in. (2009)
Front wheel stroke(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
BRAKES
Front brake
Fixed disc "Wawe type" with hydraulic control and floating
caliper.
Disc diameter ..........................................260 mm/10.23 in.
Brake caliper .........................................................BREMBO
Pad area............................................33,4 cm
Rear wheel vertical travel ............................320 mm/12.6 in.
Rear brake
Floating disc with hydraulic control and floating caliper.
Disc diameter ..........................................220 mm/8.661 in.
Brake caliper .........................................................BREMBO
Pad area............................................29,5 cm
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"x18"
TYRES
Front
Make ................................. "Michelin"-"Pirelli"-"Dunlop"Type
ENDURO COMP. 3/ MT 83 SCORPION/54R-D907
Dimensions ....................................................... 90/90-21"
(*) Inflation pressure (cold) ..........0,9÷1,0 Kg/cm
(**) Inflation pressure (cold) ... ..............1,1 Kg/cm
Rear
Make ................................. "Michelin"-"Pirelli"-"Dunlop"Type
ENDURO COMP. 3/ MT 83 SCORPION/ 70R-D907
Dimensions ..................................................... 140/80-18"
(*) Inflation pressure (cold) ..........0,8÷0,9 Kg/cm
(**) Inflation pressure (cold) ............................1,0kg/cm
(*): Racing use (**): Road use
/5.18 sq.in.
2
/4.57 sq.in.
2
- 12.8÷14.2 psi
2
- 15.6 psi
2
2
- 11.4÷12.8 psi
- 14.2 psi
2
8000H1605 (07-09)
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