Poor Medium And High Speed Performance; Compression System - Yamaha YSR50T Service Manual

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POOR MEDIUM AND HIGH SPEED PERFORMANCE
F G 1 . 1
COMPRESSION SYSTEM PROBABLE CAUSE
Cylinder and cylinder head *Loose spark plug
Broken cylinder head gasket
*Broken cylinder gasket
*Loose cylinder head or cylinder
*Worn, damaged or seized cylinder
Piston and piston ring
Improperly installed piston ring
*Worn, fatigued or broken piston ring
.Seized piston ring
.Seized or damaged piston
Crankcase and crankshaft
*Improperly seated crankcase
Improperly sealed crankcase
(Damaged oil seal)
*Seized crankshaft
Reed valve *Deformed reed valve stopper
*Improperly adjusted reed valve stopper height
elmproperly seated reed valve
*Loose intake manifold
*Broken gasket
*Broken reed valve