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ATMX

Category: Motocross
Manufacturer: Yamaha show models
Hits: 729
Year 1973
Engine Class 125
VIN Prefix AT1
Known VIN Range (Vehicle ID Numbers) 325101 to 336470
Tank Color(s) Silver Dust
Country of Sale USA
Bore (MM) 56
Stroke (MM) 50
Displacement (CC) 123
Compression Ratio (to 1) 7.8
BHP @ RPM 20 @ 8,500
Torque (kgm) @ RPM 1.7 @ 8,000
Autolube Injection? Yes
Engine Cooling Air
Carburetor Model VM26SC
Ignition Type Magneto
Ignition Timing MM (BTDC) 2.0
Primary Drive Gearing 3.9
Final Drive Gearing (Sprockets) 45/14
Box Gearing First 2.83
Box Gearing Second 1.86
Box Gearing Third 1.37
Box Gearing Fourth 1.1
Box Gearing Fifth 96
Fuel Capacity (L) 7
2 Stroke Oil Tank Capacity (L) 1.23
Gearbox Oil Capacity 0.75
Fork Oil Capacity (CC/Fork Leg) 120
Front Tire (stock) 2.75 X 21
Rear Tire (stock) 3.50 X 18
Front Brake Type Drum
Rear Brake Type Drum
Rear Suspension Twin Shock
Overall Width (mm) 910
Ground Clearance (mm) 240
Wheelbase (mm) 1,290
Dry Weight (kg) 92
Spark Plug NGK B9ES
Carburetor Type VM26SC
Main Jet 190
Needle Jet N-8
Jet Needle 5F3-3
Slide Cutaway 2.5
Pilot Jet 60
Air Screw (turns out) 1.0
Float Level (mm) 25.0

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