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- Parts /
- Engine /
- Rebuild Kits
Product Description
Product Details
Displacement 125CC | Displacement 140CC | Displacement 140CC |
Engine Type 4-Stroke | Engine Type 4-Stroke | Engine Type 4-Stroke |
Measurements size 18 1/4 in x 11 in x 11 in | Measurements size 470mm x 275mm x 280mm | Measurements size 470mm x 275mm x 280mm |
Type single-cylinder, horizontal, OHC air cooled | Type Single cylinder, horizontal, 2 valves, OHC racing head, oil cooled | Type Single cylinder, horizontal, 2 valves, OHC racing head, oil cooled |
Gears 4 speeds (primary reduction: 3.722manual, 4.059 Auto) | Gears 0-1-2-3-4 (START IN ANY GEAR 4 up) | Gears 3+1, Auto clutch, reverse |
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Sprocket: 428 15T 20mm
Gear Ratios: 2.833/1.706/1.238/0.958
Bore & Stroke: 54mm x 54mm
Compression ratio: 9.47:1
Displacement: 123.7cc
Max. HP: 8.72 HP/7500 RPM
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Measurements: 18 1/4 in x 11 in x 11 in
Max. Power & Corresponding Speed: 8kw (7500±375)
Max. Torque & Corresponding Speed:9.5N.M (5000±250
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154FMI engine
Idling Speed: 1500 RPM
Engine Oil Capacity:900ml (15w/40-SE)
Fuel Type:Gasoline
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upgrade for XR50 CRF50, CT70 CRF70
Spark plug: A7TC or NGK C6HSA
Plug Gap:. 28 or 0.6-0.8mm
Weight: 44.1/4 lbs
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Easy to hook everything up
Lubrication: Pressure / Splash
Gears: 4 speeds (primary reduction: 3.722manual, 4.059 Auto)

Replacement / upgrade for XR50 CRF50, C70 CT70 ATC90 CT110 XR and other dirt bikes
Specification
Type | Single cylinder, horizontal, 4-stroke, 2 valves, OHC racing head, oil cooled |
Clutch Type | Manual clutch |
Ignition | CDI |
Sprocket | 428-15T-17MM |
Gear | 0-1-2-3-4 (START IN ANY GEAR 4 up) |
Displacement | 140cc |
Fuel Type | Gasoline |
Engine Oil Capacity | 900ml, 15W/40-SE |
Max.Power&Corresponding Speed | 8kw (7500±375) |
Max.Torque&Corresponding Speed | 9.5N.M(5000±250) |
Compression Ratio | 8.8:1 |
Dimension | 470mm x 275mm x 280mm |
Weight | 23kg |
Starter | Kick/Electric Start |

Replacement / upgrade for Trail Bike CT70 90 110 125 and other popular bikes
Specification
Displacement | 140cc |
Type | Single cylinder, horizontal, 4-stroke, 2 valves, OHC racing head, oil cooled |
Bore x Stroke | 55mm x 59mm |
Max.Power&Corresponding Speed | 8kw (7500±375) |
Max.Torque&Corresponding Speed | 9.5N.M(5000±250) |
Clutch Type | Auto clutch |
Starter | Semi auto | Electric starter |
Ignition | CDI |
Compression Ratio | 8.8:1 |
Engine Oil Capacity | 900ml, 15W/40-SE |
Fuel Type | Gasoline |
Gears | 3+1, Auto clutch, reverse |
Sprocket | 14T 428 17mm chain |
Dimension | 470mm x 275mm x 280mm |
Weight | 23kg |

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