1. GENERAL INFORMATION
1-2
SPECIFICATIONS
Mongoose 90/MXER 90R
Model No. LA20
Overall length 1430 mm (57.2 in)
Overall width 905 mm (36.2 in)
Overall height 910 mm (36.4 in)
Wheel base 965 mm (38.6 in)
Engine type O.H.C.
Displacement 89.9 cc (5.5 cu-in)
Fuel Used
92# nonleaded gasoline
Front wheel 58 kg (127.6 lbs)
Rear wheel 56.5 kg (124.3 lbs)
Net weight
Total 114.5 kg (251.9 lbs)
Front wheel 61.5 kg (135.3 lbs)
Rear wheel 58.5 kg (128.7 lbs)
Gross
weight
Total 120 kg (264 lbs)
Front wheel 18*7-8
Tires
Rear wheel 18*9-8
Ground clearance 104 mm (4.16 in)
Starting system Motor & Kick starter
Type Gasoline, 4-stroke
Cylinder arrangement Single cylinder
Combustion chamber
type
Semi-sphere
Valve arrangement O.H.C., chain drive
Bore x stroke
47X51.8 mm
(1.85X2.04 in)
Compression ratio 10:1
Compression pressure
1600 kPa (16
kgf/cm², 227.2 psi)
Intake Open 2° (ATDC)
(1mm) Close 26° (ABDC)
Exhaust Open 44° (BBDC)
Port
timin
(1mm) Close -17° (BTDC)
Intake 0.1 mm (0.004 in)
Valve
clearance
(cold)
Exhaust 0.1 mm (0.004 in)
Idle speed 1800 rpm
Lubrication type
Forced pressure &
Wet sump
Oil pump type
Inner/outer rotor type
Oil filter type Full-flow filtration
Oil capacity
0.8 L (0.7 lmp qt,
0.85 US qt)
Lubrication System
Oil exchanging
capacity
0.7 L (0.62 lmp qt,
0.74 US qt)
Engine
Cooling Type Air cooling
Air cleaner type Sponge
Fuel capacity
5.5 L (12.1 lmp gal,
1.45 US gal)
Type PTE
Main jet No. #80
Venturi
dia.(mm)
φ16
Fuel System
Carburetor
Throttle type PISTON
Type CDI
Ignition timing 13°BTDC/1800rpm
Contact breaker Non-contact point type
Spark plug NGK CR7HSA
Ignition System
Spark plug gap
0.6～0.7 mm (0.024～
0.028 in)
Electrical Equipment
Battery Capacity 12V4AH
Clutch Type CVT
Type Helical gear
Transm
is-sion
Gear
Operation
Automatic centrifugal
Type
Type V-Belt
Primary
reduction
0.8~2.5
Power Drive System
Reduction
Gear
Final
reduction
9.255
FR/RR tire rolling
circumference
1436 mm (57.44 in)
Front
25 kPa (0.25 kg/cm²,
3.6 psi)
Tire pressure
Rear
25 kPa (0.25 kg/cm²,
3.6 psi)
Left 35°
Moving Device
Turning angle
Right 35°
Rea
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