1
GENERAL INFORMA
TION
12
GB
ENGINE
Version
EVO 250
EVO 300
Type
Single-cylinder, 4-stroke
Single-cylinder, 4-stroke
Bore x stroke
77 x 53,6
84 x 53,6
Displacement [cm
3
]
249,6
297
Pressure ratio
11,5:1
11,4:1
Fuel system
carburetor
carburetor
CARBURETOR
EVO 250
EVO 300
Version
Homologated Competition* Homologated Competition*
Carburetor type
SE BSR33-79
SE BSR33-79
Main jet
120
127,5
120
120
Slow jet
17,5
27,5
17,5
27,5
Start jet
60
60
60
60
Needle
5D132
5D132
5D132
5D132
Needle position
(from top)
2°
3°
2°
3°
Air screw turns
(from all closed)
3+1/2
2+1/2
3+1/2
2
Spacer
YES
NO
YES
NO
* Such modification makes the vehicle non-compliant with the road regulations
in force. Its use must be limited to the sole private circuits which are closed to
circulation.
Cooling system ......................................... forced liquid circulation by pump
Spark plug ............................................................................NGK CR7EB
Clutch ..................................................................................wet, multidisc