1
GENERAL INFORMATION
22
GB
ENGINE
Type ................................................. Single cylinder, 4-stroke, liquid-cooled
with countershaft and electric starting
Bore x stroke RR 390 ........................................................... 88 x 63,4 mm
Bore x stroke RR 430 ........................................................... 95 x 60,8 mm
Bore x stroke RR 480 ......................................................... 100 x 60,8 mm
Displacement (cm
3
) RR 390 ...........................................................386 cm
3
Displacement (cm
3
) RR 430 ...........................................................430 cm
3
Displacement (cm
3
) RR 480 ...........................................................478 cm
3
Compression ratio RR 390 ..............................................................12,5:1
Compression ratio RR 430 ..............................................................11,9:1
Compression ratio RR 480 ..............................................................11,9:1
Fuel system ............................................................................... carburetor
Carburetor
RR 390 RR 430 RR 480
Version
Homolog.
Competition*
Homolog.
Competition*
Homolog.
Competition*
Carburator type Keihin FCR-MX 39 Keihin FCR-MX 39 Keihin FCR-MX 39
Main jet 162 170 162 170 162 180
Idling jet 42 40 42 45 42 45
Starter jet 85 85 85 85 85 85
Needle OBDVS NCVS OBDVS NCVS OBDVR OBDVR
Needle position (from above) 1° 4° 2° 3° 3° 3°
Main air jet 200 200 200 200 200 200
Idling air jet 100 100 100 100 100 100
Mixture control screw 1 1 + 1/2 1 1 + 1/2 1 + 1/2 1 + 1/2
(from fully closed)
Intake jet 50 40 40 40 40 40
Stop YES NO YES NO YES NO
* - This change makes the vehicle not complying with the Highway Code. Use should be limited
to private circuits and routes closed to traffic.
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