Yamaha GT80F 1979 Owner's Manual page 72

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Model
GTSOF
Spark plug
B-7HS (NGK)
Carburetor
Y16P-3A, Y 16P-3H(AI)
Air cleaner
Oiled, foam rubber
Transmission:
Primary reduction system
Gear
Primary reduction ratio
68/19 (3.578)
Secondary reduction system
Chain
Secondary reduction ratio
41/14 (2.928), 41/15,(2.733)
(AI)
Clutch
Wet,multi-disc type
Gear box type
Constant mesh,4-speed forward
Gear ratio:
First
39/12 (3.250)
Second
34/17 (2.000)
Third
30/21 (1.428)
Fourth
27/24 (1.125)
Steering:
Caster
26° 30'
Trail
68 mm (2.7 in)
Tire size:
Front
2.50-15-4PR
Rear
2.75-14-4PR
Suspension:
Front
Telescopicfork
Rear
Swing arm
-65-

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