3. INSPECTION/ADJUSTMENT
3-1
SERVICE INFORMATION
GENERAL
！ WARNING
•Before running the engine, make sure that the working area is well-ventilated. Never run the
engine in a closed area. The exhaust contains poisonous carbon monoxide gas which may
cause death to people.
•Gasoline is extremely flammable and is explosive under some conditions. The working area
must be well-ventilated and do not smoke or allow flames or sparks near the working area or
fuel storage area.
SPECIFICATIONS
ENGINE
Throttle grip free play : 1～4 mm (0.04～0.16 in)
Spark plug gap : 0.6～0.7 mm (0.024～0.028 in)
Spark plug: Standard : 90 cc: NGK: CR7HSA
: 70 cc: NGK: CR7HAS
: 50 cc-4T: NGK: CR7HAS
: 50 cc-2T: NGK: R8HAS
Valve clearance : 90 cc: IN: 0.1mm (0.004 in)
EX: 0.1mm (0.004 in)
: 70 cc IN: 0.04mm (0.0016 in)
EX: 0.04mm (0.0016 in)
: 50 cc-4T IN: 0.04mm (0.0016 in)
EX: 0.04mm (0.0016 in)
Idle speed : 90 cc 1800±100rpm
: 70 cc 2000±100rpm
: 50 cc-2T 2000±100rpm
: 50 cc-4T 2000±100rpm
Engine oil capacity (90cc/70cc/50cc-4T):
At disassembly : 0.8 L (0.7 lmp qt , 0.85 US qt)
At change : 0.7 L (0.62 lmp qt , 0.74 US qt)
Gear oil capacity :
At disassembly : 0.12 L (0.11 lmp qt , 0.13 US qt)
At change : 0.11 L (0.1 lmp qt , 0.12 US qt)
Cylinder compression : 90 cc 16kg/cm²(1600kpa, 227.2psi)
: 70 cc 14kg/cm²(1400kpa, 198.8psi)
: 50 cc-4T 14kg/cm²(1400kpa, 198.8psi)
: 50 cc-2T 12kg/cm²(1200kpa, 170.4psi)
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