# S&S Cycle Royal Enfield 650 Twin High-Compression 11 To 1 Piston Kit

These high compression pistons feature a 7cc raised dome to achieve a compression ratio of 11:1 (from 9.5:1). Higher compression is a key factor in increasing performance.

-   Stock Bore X Stroke = 78 x 67.8mm, S&S 650 HC Kit = 78 x 67.mm
-   Stock Compression Ratio = 9.5:1, S&S 650 HC Kit = 11.0:1

This Part Fits:

Year

Make

Model

Submodel

2019-2022,2024

Royal Enfield

INT650

Base

## Details

- **Price:** 752.54 CAD
- **Vendor:** S&S Cycle
- **Type:** Piston Sets - Powersports

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 752.54 CAD | In stock |

## Images

- Photo - Primary

---

> Source: [Standard Auto Part](https://www.standardautopart.com/products/s-s-cycle-royal-enfield-650-twin-high-compression-11-to-1-piston-kit)
> Updated: 2026-07-13