| Black Bull Racing

MORINI

73cc / 90cc - 2 Stroke - 6-Speed

M75-C / M90-C

ENGINE: Two-Stroke Single Cylinder

CYLINDER: Light alloy with nickel silicon carbide plated liner with 7 scavenge
ports plus double exhaust scavenge ports

INTAKE DISTRIBUTION: By 8 blade fiber carbon reed valve in engine block

BORE: 47,00 /52,00 mm

90cc

STROKE: 41,8 mm

DISPLACEMENT: 72,5 / 88,77 cc

COMPRESSION RATIO: 15,5 +/- 0,5:1

MAX POWER CRANKSHAFT: 19,7 Hp (14,3 kW) at 12500 rpm / 26,3 Hp (19,3 kW) at 12500 rpm

MAX POWER WHEEL: 16,2 Hp (11,9 kW) at 12500 rpm / 23,2 Hp (17,0 kW) at 12500 rpm

MAX TORQUE CRANKSHAFT: 14,3 Nm at 12000 rpm / 19,2 Nm at 12000 rpm

COOLING: Liquid cooled forced circulation by pump

CARBURATOR: PWK 28 with manual starter by lever

LUBRIFICATION: Petrol with + 2% oil mixture sinthetic (Castrol TTS)

IGNITION:                           Electronic magnetic flywheel with internal rotor D 36mm and
                                         microprocessor ignition timing management.External ignition coil.
                                          Ignition advance 33° +/- 2° a 4000 rpm

STARTER: By kick starter (backwards kick) and elctrical starter engine

CLUTCH: Multiple disk type in oil bath

TRANSMISSION TYPE: 6 speed

PRIMARY TRANSMISSION: With helical gears Ratio sprocket/crown Z 21/74 = 3,524

                                 1. speed = 11/40=3,636
                                 2. speed = 15/37=2,466
                                 3. speed = 18/34=1,889
                                 4. speed = 20/30=1,50
                                 5. speed = 23/28=1,217
                                 6. speed = 25/27=1,08

SECONDARY TRANSMISSION: By chain ½” x 3/16” roll 8,51mm (chain sprocket Z10 to Z15)

SPARK PLUG: NGK Iridium IX BKR9EIX M14x1,25

LUBRIFICATION OIL TYPE: CASTROL TTS

OIL TYPE: AGIP 2T or CASTROL 2T - TTS

DRY WEIGHT: 13,2 kg

OIL CAPACITY TRANSMISSION: 0,44 kg / 0,5 lilter tipe SAE 15W/40