Beta RR 4T 450 - Page 12

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Workshop manual RR 4T - 250 - 400 - 450 - 525
SPECIFICATIONS - ENGINE
CARBURETTOR TUNING
250 400/450 525
Carburettor type Keihin FCR-MX 37 Keihin FCR-MX 39 Keihin FCR-MX 39
Carburettor code 3700A 3900A 3900B
Main jet 160 178 178
Jet needle OBEKT OBDVR OBDVT
Idling jet 42 42 42
Main air jet 200 200 200
Idling air jet 100 100 100
Needle valve position 3. 3. 3.
Starting jet 85 85 85
Fuel mixture adj. screw open by 0,75 turns 1,25 turns 1,25 turns
Throttle valve 15 15 15
Power reduction throttle valve stop throttle valve stop throttle valve stop
Pump diaphragm stop 858 / 2,15 mm 858 / 2,15 mm 858 / 2,15 mm