Description
OEM rocker arm 64mm two-valve assembly for Type 1 139QMB engines, including Chicago Scooter Company go, go MAX, Pug 50, Nitro Sport 50 and Bella Classic 50 scooters.
Type 1 engines have a shorter head and 64mm long valve stems. If you have 69mm valve stems and a taller cylinder head, you have the Type 2 engine made by Zhejiang ZhongNeng aka ZNEN. This product does not work with Type 2 engines.
Specifications:
- Rocker Arm Holder L: 66mm / W: 66mm / H: 26mm / Holes: 7.4<9mm / Space: 50mm
- Shaft Inlet L: 51.3mm / OD: 8.8<12.9mm / ID: M5
- Shaft Outlet L: 43.5mm / OD: 10mm / ID: M5
- 2 Rocker Arms L: 52.7mm / W: 22.2mm / H: 18.6mm
- 2 Tappets L: 18.53mm / OD: M5x0.5mm
- 2 Nuts L: 4.2mm / ID: M5x0.5mm / OD: 9mm
Compatibility:
| CSC Bella Classic 50 | CSC Nitro Sport 50 |
| CSC Pug 50 | CSC go |
| CSC go MAX |
139QMB-based 50cc / 80cc engines with the following engine codes:
| 139QMA | 139QMB | 1P39QMB | 1P39QMA-2 |
| YN139QMB | JJ1P39QMB | 139FMA-2 | BD1P39QMB |
| BN139QMB | 147QMD | Other QMA models | Other QMB models |
Don’t see your engine listed? If the engine code includes “QM” or “FM”, and you’re running a Type 1 engine, this product is compatible with your vehicle.
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