4
Technological parameters for main performance
Items
Type
YF300
Type
LX178MN
Style
Single cylinder, 4 stokes, standing type engine,
water cooled, 4 air valves, double OHV
Main
parameters
for
performance
Max. power and its
rotation speed
(19.3±5%)kW/(8500±1.5%)rpm
Max. torque and its
rotation speed
（
24.5±5%
）
N·m/
（
7000±1.5%
）
rpm
Min. fuel consumption
≤
340 g/km·h
Min. steady rotation
speed of idling
（
1500
±
150
）
rpm
Main
parameter
for structure
Cylinder bore
78mm
Piston stroke
61.2mm
Total displacement
292.4ml
Compression ratio
11.0
：
1
Air intake
OHV
Ignition
CDI
Lubrication
Pressure and splash
Cooling
Water
Transmission
device
Type of clutch
Manual operation clutch, wet and plates
Gearshift
International gearshift
Primary ratio
2.864
1
st
gear
3
2
nd
gear
2
3
rd
gear
1.5
4
th
gear
1.25
5
th
gear
1.05
6
th
gear
0.905
Starting
Foot and electrical
Carburetor
Vacuum and diaphragm MV34-5A
Ignition advance angle curve or
working-set point
1700±200r/min when 0˚ ± 1˚
5000± 200r/min when 25˚ ± 1˚
Spark plug
Resistive B8RC
Lockage angle for air intake
valve
Open
BTDC 0
°
（
Open is 1
）
Close
ABDC 40
°（
Close is 1
）
Lockage angle for air exhaust
valve
Open
BBDC 37
°（
Open is 1
）
Close
ATDC 2
°
（
Close is 1
）
Brand of lubricant
15W/40-SE
Capacity of lubricant (mL)
1500±100mL
Net weight of lubricant (
㎏
)
34±1kg