CZ 125 Specs
  71-72 "Yellow Tank" 125 73 "Radial" 125 74 "Red Frame" 125
Engine/Frame ID 984 through 984.3 984.5 984.5
Bore/Stroke (metric) 55mm X 52mm 55mm X 52mm 55mm X 52mm
Stock Carb N/A N/A N/A
Horsepower 19 19 19
Compression Ratio 13:01 13:01 13:01
Primary Drive 2.304:1 (23/53) 2.304:1 (23/53) 2.304:1 (23/53)
1st Gear Ratio 3.1:1  (9/28) 3.1:1  (9/28) 3.1:1  (9/28)
2nd Gear Ratio 2.16:1  (12/26) 2.16:1  (12/26) 2.16:1  (12/26)
3rd Gear Ratio 1.64:1  (14/23) 1.64:1  (14/23) 1.64:1  (14/23)
4th Gear Ratio 1.31:1  (16/21) 1.31:1  (16/21) 1.31:1  (16/21)
5th Gear Ratio 1.111:1 (18/20) 1.111:1 (18/20) 1.111:1 (18/20)
Teeth: C/S Sprocket 14 14 14
Teeth: Rear Sprocket 62 62 62
Susp Travel - Front 6.7" 6.7" 190mm
Susp Travel - Rear 3.5" 3.5" 90mm
Weight 220 Dry 220 Dry 220 Dry
Tires 2.75X21, 3.50X18 2.75X21, 3.50X18 2.75X21, 3.50X18
Rims 1.60X21, 1.85X18 1.60X21, 1.85X18 1.60X21, 1.85X18
Ignition ADV. 2.4 BTDC 2.4 2.4
Fuel Capacity (Stock) 1.8 Gal 2.5 Gal 2.1 Gal
Std Bore 54.93mm 54.93mm 54.93mm
1st Over (+.25) 55.18mm 55.18mm 55.18mm
2nd Over (+.50) 55.43mm 55.43mm 55.43mm
3rd Over (+.75) 55.68mm 55.68mm 55.68mm
4th Over (+1.00) 55.93mm 55.93mm 55.93mm
Price (MSRP) N/A N/A N/A
  75-76 Falta 125 77-83 Model-511 H20 Cooler
Engine/Frame ID 984.9 511 519
Bore/Stroke (metric) 55mm X 52mm No Data Available No Data Available
Stock Carb N/A
Horsepower 21
Compression Ratio 14.5:1
Primary Drive 2.304:1 (23/53)
1st Gear Ratio 3.1:1  (9/28)
2nd Gear Ratio 2.16:1  (12/26)
3rd Gear Ratio 1.64:1  (14/23)
4th Gear Ratio 1.31:1  (16/21)
5th Gear Ratio 1.111:1 (18/20)
Teeth: C/S Sprocket 14
Teeth: Rear Sprocket 62
Susp Travel - Front 7.87"
Susp Travel - Rear 5.0"
Weight N/A
Tires 2.75X21, 3.50X18
Rims 1.60X21, 1.85X18
Ignition ADV. 1.8 - 2.0
Fuel Capacity (Stock) 2.1 Gal
Std Bore 54.93mm
1st Over (+.25) 55.18mm
2nd Over (+.50) 55.43mm
3rd Over (+.75) 55.68mm
4th Over (+1.00) 55.93mm
Price (MSRP) N/A