Yamaha F4A Service Manual

Water pump installation
NOTE:
9When removing or installing the impeller,
apply a thin coat of water resistant grease
to the entire surface of the drive shaft.
9Apply the grease to the impeller blades,
insert cartridge inner surface.
9Be sure to turn the drive shaft clockwise,
otherwise the impeller blade will be twist-
ed the other way. thus reducing pump
performance.
1. Install:
9Dowel pin 1 (drive shaft)
9Impeller 2
9Water pump housing 3 with insert
cartridge 4
9Plate 5
9Bolt 6
Impeller and insert cartridge inspection
1. Inspect:
9Impeller
9Insert cartridge
Crack/Distortion/Burning/Damage
® Replace.
E
WATER PUMP
LOWR
1
2
3
4
5
6
SERVICE POINTS
Water pump housing inspection
1. Inspect:
9Water pump housing
9Outer plate cartridge
Crack/Twist/Scratch/Damage
® Replace.
2. Inspect:
9Plate
Crack/Twist/Scratch/Damage
® Replace.
6-6

Yamaha F4A Specifications

General

Starting System	Manual
Fuel Induction System	Carburetor
Ignition System	CDI
Lubrication System	Wet sump
Max. Output	4 hp
Gear Ratio	2.08:1
Dry Weight	27 kg
Shaft Length	381 mm (S), 508 mm (L)
Steering	Tiller
Gear Shift	Forward, Neutral