Yamaha F4A Service Manual

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E
SPEC
MAINTENANCE SPECIFICATIONS
Item Unit
Model
F4A/F4
TEST PROPELLER
Test propeller Parts No. YB-1630/90890-01630
Specific revolution r/min 5,250~5,450
LOWER
Item Unit
Model
F4A/F4
IGNITION SYSTEM
Ignition timing Degree BTDC 28~32
T.C.I. system output peak voltage
(W-B)
@ cranking (300 r/min) open V 126
T.C.I. air gap mm (in) 0.4~0.6 (0.016~0.023)
Spark plug gap mm (in) 0.6~0.7 (0.024~0.028)
Spark plug cap resistance
(with resister type) k½ 4.0~6.0
Ignitor ass’y resistance
Primary coil (W-B) ½ 0.56~0.84
Secondary coil
(W-Hi-tension cord) k½ 11.60~17.40
ELECTRICAL

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