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Piston Pin Retaining Circlip for CSC TT250 SG250
Original replacement component for CSC TT250 and SG250. This part is identified by CSC ZT63-101 and Zongshen manufacturer code 100100587.
What This Part Does and Why You Might Need It
This retainer holds the wrist pin axially inside the piston. Reusing a deformed retaining ring risks internal engine damage; fit a correct new retainer fully in the groove during piston service.
OEM Identification and Specifications
- CSC SKU: ZT63-101
- Zongshen manufacturer reference (2026 stock export): 100100587
- Product type: Piston wrist-pin retaining ring
- Position: Piston pin groove in piston
- Zongshen 100100587 piston-pin check/retaining ring; one clip sold; diameter/groove measurement not provided
Fitment and Important Ordering Details
Cataloged CSC applications: TT250 and SG250. This is one individually sold component, unless the description explicitly identifies a multi-piece assembly. Match the original part number, shape and dimension before ordering. Similar CG125/CG200/CG250 parts can vary by design and production revision; no unverified model compatibility is claimed.
- Brand: Pirate Mfg
- Condition: New
- SKU: ZT63-101
- Manufacturer Part Number: 100100587
- Part Type: Piston wrist-pin retaining ring
- Model: TT250; SG250
- Make: CSC Motorcycles
- Fitment Notes:: Factory parts books identify ZT63-101 / 100100587 for CSC TT250 and SG250. Confirm exact model, year and manufacturer number before purchase. Do not equate similar dimensions with verified interchange.
- Country of Manufacture: China
- Performance Part: No
- Items Included: Piston wrist-pin retaining ring
- Number of Pieces: 1
- Country of Origin: China





