Hero
Hero Genuine Cylinder Kit for Passion Pro | Bore Kit / Block Piston Kit with Piston | 21K220S
Hero Genuine Cylinder Kit for Passion Pro | Bore Kit / Block Piston Kit with Piston | 21K220S
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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 Kit for Passion Pro | Bore Kit / Block Piston Kit with Piston | 21K220S
Product Description
If your Hero Passion Pro has low compression, piston noise, smoke from the silencer, weak pickup, or high oil consumption, this Hero Genuine Cylinder Kit is the correct OEM rebuild option for restoring the top end of the engine.
This is genuine Hero part number 21K220S. Your actual stock box clearly mentions CYLINDER KIT (PASSION PRO), so this listing is built as a Passion Pro-specific cylinder kit, not as a broad HF or Splendor family kit. In buyer language, customers may search this as a cylinder kit, bore kit, block piston kit, piston-cylinder kit, or engine rebuild kit.
This kit is ideal when the old cylinder and piston are worn and the bike has started losing power, burning oil, or producing piston slap noise. Compared with local aftermarket bore kits, a genuine Hero kit gives stronger buyer confidence for machining accuracy, part matching, and rebuild reliability. Public seller references also support a Passion Pro-specific positioning for 21K220S, which aligns with the printed box description on your stock.
This listing stays tightly focused on Passion Pro to reduce wrong orders and improve buyer confidence.
Key Features
- Genuine Hero part number 21K220S
- Box-marked as Cylinder Kit (Passion Pro)
- OEM top-end rebuild kit for Passion Pro
- Common buyer search terms covered: bore kit, block piston kit, cylinder kit
- Useful for low compression, smoke, power loss, and worn bore rebuilds
- Better trust and fitment confidence than generic aftermarket kits
- Complete rebuild-style pack with cylinder, piston-related parts, and gaskets
- Good search intent match for Passion Pro cylinder kit and Passion Pro bore kit
Confirmed Compatibility
| Model | Compatibility Status | Notes |
|---|---|---|
| Hero Passion Pro | Compatible | Box clearly says CYLINDER KIT (PASSION PRO) |
| HF Dawn | Not listed | Do not sell from this listing without separate verification |
| HF Deluxe | Not listed | Do not sell from this listing without separate verification |
| Splendor Plus | Not listed | Do not sell from this listing without separate verification |
| Passion Plus / other Hero commuters | Not confirmed | Match old part and verify separately before sale |
| 1 | HF Deluxe (Nov, 2013) |
|---|---|
| 2 | Passion Pro (Jan, 2014) |
| 3 | Splendor iSmart (Dec, 2013) |
Parts List for "21K220S"
| S.No | Part No | Description | Qty | Part Image |
|---|---|---|---|---|
| 1 | 12251-KST-94099 | GASKET CYLINDER HEAD | 1 |  |
| 2 | 12391-AAH-00099 | GASKET CYL HEAD COVER | 1 |  |
| 3 | 13011-KCC-942 | RING SET, PISTON (STD) | 1 |  |
| 4 | 13101-KCC-901 | PISTON | 1 |  |
| 5 | 13111-087-000 | PIN, PISTON | 1 |  |
| 6 | 13115-001-000 | CLIP, PISTON PIN | 2 |  |
| 7 | 12101-KST-940 | CYLINDER | 1 |  |
| 8 | 12191-AAH-F0099 | GASKET CYLINDER | 1 |  |
What’s in the Box
Based on the printed contents on your box and what is visible in the photos:
- Cylinder – 1
- Gasket cyl head cover – 1
- Gasket cyl head – 1
- Gasket cylinder – 1
- Piston set (STD) – 1
- Ring set piston (STD) – 1
- Pin set – 1
- Piston pin clip – 2
Technical Details
- Brand: Hero Genuine Parts
- Part Number: 21K220S
- Product Name on Box: Cylinder Kit (Passion Pro)
- Type: Engine cylinder / bore kit with piston components
- Net Quantity: 1 number
- MRP on box: ₹1719.00
- Manufacturing Date on box: 03/2026
- Specification visible on pack: STD
Installation / Fitment Note
This is an engine rebuild part and should be installed by a mechanic. Before ordering, match:
- bike model as Passion Pro
- old cylinder/piston application
- bore specification
- engine rebuild requirement
Because this is a precision engine part, buyers should not order only by visual similarity.
FAQs
Q1. What is 21K220S?
It is a genuine Hero cylinder kit / bore kit for Passion Pro.
Q2. Is this really for Passion Pro?
Yes. Your actual stock box clearly says CYLINDER KIT (PASSION PRO).
Q3. What comes inside this kit?
The box shows cylinder, piston set, piston ring set, pin set, pin clips, and gaskets.
Q4. Is this a full bore kit?
Yes. It is sold as a complete cylinder kit for top-end rebuild work.
Q5. What does STD mean here?
The pack markings visible in your photos show STD, indicating standard-size application.
Q6. When do I need this kit?
Usually when the bike has low compression, oil burning, smoke, weak pickup, or cylinder-piston wear.
Q7. Can I order this for HF Deluxe or Splendor Plus?
No. This stock should be sold as Passion Pro only unless separately verified.
Q8. What should be matched before ordering?
Match the old cylinder/piston application and confirm with your mechanic before purchase.
Verify Fitment on Official Brand Portals
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
