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CHAPTER 4

FUEL SYSTEM

FUEL SYSTEM...........................................................................................................4-1

EXPLODED DIAGRAM ........................................................................................4-1

CLEANING AND INSPECTION ............................................................................4-3

INSTALLATION.....................................................................................................4-5

CARBURETTOR ........................................................................................................4-6

EXPLODED DIAGRAM ........................................................................................4-6

REMOVAL AND DISASSEMBLY ..........................................................................4-7

INSPECTION........................................................................................................4-8

ASSEMBLY...........................................................................................................4-9

INSTALLATION...................................................................................................4-10

CHAPTER 5

POWER UNIT

EXPLODED DIAGRAM ..............................................................................................5-1

PREPARATION FOR THE OVERHAUL ....................................................................5-2

REMOVAL ..................................................................................................................5-2

DISASSEMBLY ..........................................................................................................5-3

CHECKING THE CRANKSHAFT .......................................................................5-14

INSPECTION ............................................................................................................5-15

CYLINDER HEAD...............................................................................................5-15

CYLINDER BLOCK ............................................................................................5-16

PISTON...............................................................................................................5-17

PISTON RING ....................................................................................................5-19

PISTON PIN AND SMALL END BEARING ........................................................5-20

CRANKSHAFT....................................................................................................5-20

REED VALVE......................................................................................................5-21

THERMOSTAT....................................................................................................5-22

BALL BEARING..................................................................................................5-22

ASSEMBLY AND ADJUSTMENT ............................................................................5-23

BEARING, OILSEAL AND O-RING ....................................................................5-23

PISTON...............................................................................................................5-23

SMALL END BEARINGS AND PISTON ASSEMBLY.........................................5-24

CRANK CYLINDER ASSEMBLY ........................................................................5-25

CYLINDER HEAD AND EXHAUST COVER ......................................................5-25

INTAKE MANIFOLD ...........................................................................................5-26

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Yamaha 20C Service Manual

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