KYMCO Bet & Win 250 User Manual

6. CYLINDER HEAD/VALVES
6-3
Bet & Win 2 50
TROUBLESHOOTING
• The poor cylinder head operation can be diagnosed by a compression test or by tracing engine
top-end noises.
Poor performance at idle speed White smoke from exhaust muffler
• Compression too low • Worn valve stem or valve guide
• Damaged valve stem oil seal
Compression too low
• Incorrect valve clearance adjustment Abnormal noise
• Burned or bend valves • Incorrect valve clearance adjustment
• Incorrect valve timing • Sticking valve or broken valve spring
• Broken valve spring • Damaged or worn camshaft
• Poor valve and seat contact • Worn cam chain tensioner
• Leaking cylinder head gasket • Worn camshaft and rocker arm
• Warped or cracked cylinder head
• Poorly installed spark plug
Compression too high
• Excessive carbon build-up in combustion
chamber
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KYMCO Bet & Win 250 Specifications

General

Displacement	249.4 cc
Cooling System	Liquid-cooled
Fuel System	Carburetor
Transmission	CVT
Front Suspension	Telescopic fork
Front Brake	Disc
Rear Brake	Disc
Fuel Capacity	12 liters
Ignition	CDI
Width	770 mm
Height	1, 370 mm
Seat Height	780 mm
Engine Type	4-stroke, single-cylinder