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54mm Piston Ring Kit for 125cc Horizontal Engine ATV Dirt Bike | 14mm Pin
54mm Piston Ring Kit for 125cc Horizontal Engine ATV Dirt Bike | 14mm Pin
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Product Overview
Restore compression and reliable engine performance with this 54mm piston and ring kit, designed for select 125cc horizontal engines commonly used in Chinese ATVs, dirt bikes, pit bikes, quads, and other small powersports vehicles.
Featuring a 54 mm piston diameter, 14 mm piston pin, and 40.8 mm pin length, this kit is compatible with many horizontal-engine applications from brands such as SSR, BMS, NST, JCL, TaoTao, Baja, Kazuma, SUNL, Coolster, and Jetmoto.
This kit is specifically designed for horizontal 125cc engines and is not intended for vertical 125cc engines. Because different 125cc engines can use different piston and wrist-pin dimensions, always measure your original parts before ordering.
Product Compatibility
| Brand / Application | Engine | Fitment Notes |
|---|---|---|
| SSR | Select 125cc | Horizontal engine only |
| BMS | Select 125cc | Verify 54mm piston and 14mm pin |
| NST | Select 125cc | Horizontal engine only |
| JCL | Select 125cc | Verify original piston |
| TaoTao | Select 125cc | Horizontal engine only |
| Baja | Select 125cc | Verify dimensions |
| Kazuma | Select 125cc | Horizontal engine only |
| SUNL | Select 125cc | Verify original piston |
| Coolster | Select 125cc | Horizontal engine only |
| Jetmoto | Select 125cc | Verify dimensions |
| Other Chinese ATVs | Select 125cc | 54mm / 14mm horizontal applications |
| Dirt / Pit Bikes | Select 125cc | Horizontal engine only |
Important Fitment Requirements
This piston kit is intended for compatible 125cc horizontal engines using:
- 54 mm piston diameter
- 14 mm piston pin diameter
- 40.8 mm piston pin length
Do not order based on engine displacement or brand alone.
There are multiple types of Chinese 125cc engines. Some use a horizontal cylinder layout, while others use a vertical layout. Even among horizontal engines, piston-pin diameter and piston design can differ.
Specifications
| Specification | Details |
|---|---|
| Product Type | Piston & Ring Kit |
| Engine Displacement | Select 125cc |
| Engine Type | Horizontal Engine |
| Piston Diameter | 54 mm / 2.13 in |
| Piston Pin Diameter | 14 mm / 0.55 in |
| Piston Pin Length | 40.8 mm / 1.61 in |
| Application | ATV / Dirt Bike / Pit Bike / Quad |
| Installation | Engine Top-End Replacement |
| Vertical Engine Compatibility | No |
Key Features
- 54mm Piston for Select 125cc Engines – Designed for compatible horizontal 125cc ATV and dirt bike engines.
- 14mm Wrist Pin – Uses a 14 mm piston-pin diameter for more precise fitment identification.
- Top-End Repair Solution – Suitable for replacing worn or damaged piston and ring components during an engine rebuild.
- Wide Chinese Powersports Application – Compatible with select SSR, TaoTao, Baja, Kazuma, SUNL, Coolster, BMS, JCL, NST, Jetmoto, and similar machines.
- Easy Fitment Verification – Clearly specified piston and wrist-pin dimensions help reduce incorrect orders.
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