• Hero Genuine Cylinder STD Kit / Block Piston Kit for CD 100 SS (formerly CD 100 SS Mar 2005) – 21K120LS
  • Hero Genuine Cylinder STD Kit / Block Piston Kit for CD 100 SS (formerly CD 100 SS Mar 2005) – 21K120LS
  • Hero Genuine Cylinder STD Kit / Block Piston Kit for CD 100 SS (formerly CD 100 SS Mar 2005) – 21K120LS
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Hero

Hero Genuine Cylinder STD Kit / Block Piston Kit for CD 100 SS (formerly CD 100 SS Mar 2005) – 21K120LS

Hero Genuine Cylinder STD Kit / Block Piston Kit for CD 100 SS (formerly CD 100 SS Mar 2005) – 21K120LS

Rs. 1,780.00
Rs. 1,982.00 Rs. 1,780.00
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Important Order Policy
Please order only after confirming the part number, model, variant, year, side, connector type and compatibility. All orders are non-cancellable once placed. Correctly shipped spare parts are not eligible for return, exchange or refund due to wrong selection, wrong diagnosis, fitment mismatch, mechanic recommendation or change of mind. Electrical/electronic items are additionally non-returnable once opened, installed, plugged in, tested or used. Wrong item, damaged item or missing item claims require a complete unboxing video within 24 hours. Read full Return & Warranty Policy

Hero Genuine Cylinder STD Kit / Block Piston Kit – 21K120LS

The Hero Genuine 21K120LS is a Cylinder STD Kit, sold by Hero as a complete OEM engine rebuild / engine cylinder block kit with piston for the CD 100 family. Independent seller references tighten the application more precisely to 100 SS / formerly CD 100 SS. The part is sold as 1 unit and is positioned as a top-end engine rebuild component.

For buyer-language SEO, this product should target both OEM and market terms such as cylinder std kit, block piston kit, bore kit, block piston assembly, and cylinder kit. Independent references use these alternate names for the same SKU, which helps broaden search coverage without changing the actual product identity.

Because this is a major top-end engine repair part, the listing stays tight and model-specific. The strongest match is 100 SS / CD 100 SS, not a broad all-Hero commuter fitment claim. Buyers should verify 21K120LS against the old part, engine build requirement, or mechanic recommendation before ordering.

Key Features

  • Genuine Hero OEM part with part number 21K120LS.
  • Official Hero naming centers on Engine Cylinder Block Kit with Piston / Cylinder STD Kit.
  • Strongest supported fitment is CD 100 / 100 SS / formerly CD 100 SS.
  • Also commonly searched as Block Piston Kit, Bore Kit, Block Piston Assembly, and Cylinder Kit.
  • Sold as 1 unit.
  • Suitable for stock-spec engine top-end rebuild or cylinder replacement work.
  • Best ordered by exact part number match on older Hero/Hero Honda applications.

Compatibility Table

Model Variant / Family Compatibility Status Notes
CD 100 Official Hero listing Confirmed Hero shop presents it as CD 100 rebuild kit.
100 SS Formerly CD 100 SS Confirmed Strong seller-side fitment wording.
H.H. CD100SS Legacy naming Supported Seen in independent dealer reference.

Fitment caution: The safest merchandising position is CD 100 SS / 100 SS, because official shop wording is broader while independent seller and dealer references narrow it more precisely.

Variants

  • No LH/RH variant found.
  • Sold as 1 unit.
  • No color variant indicated.

What’s in the Box

  • 1 x Hero Genuine Cylinder STD Kit / Engine Cylinder Block Kit with Piston

Installation / Fitment Notes

  • Match 21K120LS with the old kit before ordering.
  • Recommended for engine rebuild, top-end repair, or standard-bore cylinder replacement.
  • Best suited to CD 100 / 100 SS applications supported above.
  • Professional installation is recommended because this is a major engine internal / top-end component.

FAQs

Q1. Is 21K120LS a genuine Hero part?
Yes, Hero’s official shop lists 21K120LS as a genuine Hero engine cylinder block kit with piston.

Q2. What is 21K120LS called?
It is commonly called Cylinder STD Kit, Block Piston Kit, Bore Kit, or Cylinder Kit.

Q3. What bike does 21K120LS fit?
The strongest supported application is 100 SS / formerly CD 100 SS, while Hero’s own shop broadly presents it as a CD 100 kit.

Q4. Is this a full engine rebuild kit?
No Hero markets it as an Engine Cylinder Block Kit with Piston.

Q5. Does it fit all CD 100 variants?
That should not be stated broadly. The safer fitment position is CD 100 SS / 100 SS, verified by exact part number.

Q6. How many pieces are included?
The current official and seller listings show 1 unit.

Verify Fitment on Official Brand Portals

For selected genuine spare parts, you can cross-check the part number on the official brand portals before ordering.

Royal Enfield Official Spares Portal

Hero MotoCorp Official eCatalogue

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