Cylinder Set 50ccm 38mm Sachs 504 505 | Hercules Optima Prima M Tuning | Gasket Included
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IN STOCK - Delivery time 1-3 working days
- Item no: 103129
- EAN: 4060861201813
- Manufacturer: Citomerx
- Manufacturer no.: 103129
Citomerx Cylinder Set 50ccm 38mm (Optima 40-50km/h Version) + Gasket for Hercules Optima / TUNING Prima M 2 3 4 5 Sachs 504 505 – Part No. 103129
Your Hercules Optima or Sachs 504/505 engine isn’t running smoothly anymore? This high-quality 50ccm cylinder set (38mm) from Citomerx will get your moped back in top shape! Perfect as a replacement for the original cylinder or as a performance-enhancing tuning upgrade for your two-wheeler.
Product Features & Benefits:
✅ Precision fit for Hercules Optima and Prima M 2-5 with Sachs 504/505 engines
✅ Optimized performance for a higher top speed of around 40-50 km/h
✅ High-quality materials for durability and reliability
✅ Complete set including a matching gasket – easy installation without extra parts
✅ Perfect for tuning or as a spare part – ideal for restoration or repair
Scope of Delivery:
- Cylinder 50ccm (38mm) for Sachs 504/505
- Matching gasket
Compatibility:
- Hercules Optima 40-50 km/h Version
- Prima M 2 / 3 / 4 / 5
- Sachs 504 / 505 engines
Customers often searched for this item using these keywords:
50cc moped cylinder, Sachs 504 505 cylinder, Hercules Optima tuning, Sachs Prima M cylinder, 38mm moped cylinder, Sachs 50cc cylinder kit, Hercules spare parts, Sachs 505 tuning cylinder, Hercules Prima M4 cylinder
Product type: | Cylinder set |
Piston pin diameter: | 12 mm |
Displacement: | 50 cc |
Tuning & Styling Part: | Yes |
Piston ring profile: | Rectangular ring |
Vintage part: | Yes |
suitable for crankshaft: | 44 mm Hub |
Surface finish: | Matt |
Inlet inside dimension: | 13.5 x 23.5 mm, angular (connection ASS: straight) |
OE/OEM reference number(s): | 0213146376, 0213 146 376 |
ATTENTION!: | Tuning for moped models! |
GTIN: | 4060861201813 |
Inlet stud spacing: | 32 mm |
Inlet stud bolt thread: | M6 |
Diffuser internal dimension: | 26 mm |
Cylinder dimensions (LxWxH): | 130 x 130 x 120 mm |
Outlet Stud distance: | 50 mm |
Scope of delivery: | Decompression valve screw plug, Gasket set, Piston, Piston rings, Cylinder |
Outlet stud bolt thread: | M6 |
Cylinder stud distance: | 56 x 56 mm |
Cylinder stud bore: | 8 mm |
Manifold connection type: | Flange |
Color: | Grey |
Spark plug thread: | M14 x 1.25 |
Number of piston rings: | 2 |
Features: | Durable, Corrosion resistant |
Engine type: | 2-stroke |
Scope of delivery: | 1x cylinder set |
Manufacturer number: | 103129 |
Country and region of manufacture: | China |
Type of motorcycle: | Moped & Mokick |
Offer package: | Yes |
Units quantity: | 1 |
Description of the package content: | Cylinder + piston + gasket set |
Manufacturer warranty: | 2 years |
Weight: | 1.70 kg |
Material: | Gray cast iron |
Type: | Optima 40-50km/h version |
ZS 2Radteile GmbH
Unterbibracherstr. 3
95519 Vorbach
Web page https://www.citomerx.de
Email: [email protected]

Citomerx stands for quality, precision, and performance for motorcycles, scooters, mopeds, and quads. As a renowned manufacturer, Citomerx offers a broad range of parts and accessories designed for both DIY enthusiasts and professional workshops. With cutting-edge manufacturing technology, strict quality controls, and innovative design, Citomerx sets new standards for durability and performance.
From cylinder kits and variator weights to exhaust systems and brake components, Citomerx reliably delivers solutions that meet the highest demands. Known for precise fit and excellent value for money, Citomerx parts are the first choice for maintaining and enhancing two-wheelers.
Citomerx understands the needs of riders and offers products engineered for maximum durability and efficiency. Constantly evolving to keep pace with market trends and technological advances, Citomerx is a trusted name for those who value performance, safety, and modern design.
Choose Citomerx – for uncompromised riding pleasure and reliable technology.