I,ve built numerous bikes eith the 49cc cag pocket bike engine. I doubt i'll build another after i use the last of the engines and parts that i already have.
while having less torque than the 70cc bicycle engine, with some porting, jetting , etc. thise things 'll scream up to 14000rpm!!!! but the heads/ pistons take a real beating.
Speaking of options, this is in my opinion, the motor to try . I know i'd sure like to . one day soon i'll get one and let you know. check it out 65cc with 6 speed gearbox, wet clutch pushin over 15 hp
made by morini
::. POWER - TORQUE - CONSUMPTION
ENGINE Two-Stroke Single Cylinder
CYLINDER Light alloy with nickel silicon carbide plated liner with7 scavenge ports plus double exhaust scavenge ports
INTAKE DISTRIBUTION By 4 blade fiber carbon reed valve in engine block
BORE 44,50 mm
STROKE 41,75 mm
DISPLACEMENT 64,93 cc
COMPRESSION RATIO 15,5 +/- 0,5:1
MAX POWER CRANKSHAFT 16,7 Hp (12,3 kW) at 12500 rpm
MAX POWER WHEEL 15,2 Hp (11,2 kW) at 12500 rpm
MAX TORQUE CRANKSHAFT 9,8 Nm at 12000 rpm
MAX RPM 15000 rpm
COOLING Liquid cooled forced circulation by pump
CARBURATOR Dell'Orto PHBL 24 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)
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 Z12 or Z13)
CHAIN ALIGNMENT 86 mm
SPARK PLUG Champion C53 / NGK B105EGV M14x1,25
FUEL EURO unleaded NC 623-02 R.O.N. 95
LUBRIFICATION OIL TYPE CASTROL TTS
OIL TYPE AGIP 2T or CASTROL 2T - TTS
DRY WEIGHT 13,2 kg
OIL CAPACITY TRANSMISSION 0,44 kg tipe SAE 15W/40