Beta RR 250 - Engine and Carburetor Details

1
GENERAL INFORMATION
22
GB
ENGINE
Type ................................................. Single-cylinder, 2-stroke, liquid cooled
and electric start
Bore x stroke RR 250 ........................................................... 66,4 x 72 mm
Bore x stroke RR 300 .............................................................. 72 x 72 mm
Displacement (cm
3
) RR 250 ...........................................................249 cm
3
Displacement (cm
3
) RR 300 ........................................................293,1 cm
3
Compression ratio RR 250 ..............................................................12,8:1
Compression ratio RR 300 .................................................................12:1
Fuel system ............................................................carburetor without mixer
Carburetor
* - Such modifi cation 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.
RR 250 RR 300
Version Certif.
Competition* Certif. Competition*
Carburetor type PWK 36S AG PWK 36S AG
Main jet 118 165 118 165
Slow jet 35 35 38 35
Start jet 50 85 50 85
Needle N84K N0ZK N84K N2ZJ
Needle position (from top) 3°+1/2 2° 4° 3°
Air screw turns (from all closed) 1 + 3/4 1+1/4 2 1+1/4
Striker YES NO YES NO