S3 Cylinder Head Power Kit for RIEJU MR 250 & GasGas EC 250 Bikes (2018-2025) - (Titanium)
S3 Cylinder Head Power Kit in Titanium for Rieju MR 250 & GasGas EC 250. Improves torque, power delivery, and heat management for aggressive riding.
| Brand: S3 |
| Color: Titanium |
| Head Kit Type: Power |
| Engine Displacement: 250 cc |
Internal Reference:
S3-PWR-1058-250-T
Product Information
The S3 Cylinder Head Power Kit is designed for riders who want to optimize their Rieju MR 250 or GasGas EC 250 for more responsive performance. By modifying compression, this kit allows the engine to use one more gear, improving torque and overall power delivery without compromising reliability.
Its engineering also addresses heat management, reducing the common hot spots found on original cylinder heads. This makes the bike more capable under aggressive riding conditions, whether on trails, climbs, or fast enduro sections. The kit is particularly recommended for use at altitudes around 1000m, where standard heads may lose efficiency.
All components are designed for straightforward installation and precise fit, helping maintain consistent engine performance. Riders looking for strong, predictable power and smoother throttle response will find this kit an essential upgrade for spirited enduro riding.
Power Kit vs Extreme Kit
Feature | Power Kit | Extreme Kit |
|---|---|---|
| Compression | Modifies compression for one more usable gear, improving torque and mid-range power delivery | Modifies compression for smoother, progressive power, improving traction and control in technical sections |
| Heat Management | Reduces typical cylinder head hot spots | Reduces typical cylinder head hot spots |
| Riding Style | Aggressive enduro and fast trail sections | Extreme style riding, technical terrain, tight control |
| Throttle Response | Strong, predictable power delivery | Smooth, progressive power for better traction |
| Best For | Riders looking for more engine torque and an additional gear | Riders focusing on technical riding with precise engine control |
Both kits are engineered to maintain OEM-level fit and are easy to install on compatible bikes.
Tip: If you want strong torque and an extra gear for spirited enduro riding, stick with the Power Kit. For technical trails and precise throttle control in extreme conditions, check out the Extreme Kit.
Includes
- Cylinder head cover
- Cylinder head insert
- O-rings
Key Features & Benefits
- Improved Power Delivery – Adjusted compression allows use of an additional gear.
- Better Engine Torque – Smoother, more responsive mid-range performance.
- Heat Management – Reduces hot spots for safer, longer engine operation.
- Aggressive Riding Ready – Ideal for technical trails and fast enduro riding.
- Complete Kit – Includes all components needed for installation.
Fitment
GASGAS (2018–2020):
- EC 250
RIEJU (2021–Present):
- MR 250
Rider FAQ
Q: Will this kit work at low altitude?
A: Yes, but it is optimized for average altitude around 1000m to maintain compression balance.
Q: Does installation require engine modifications?
A: No major engine modifications are needed. The kit installs directly onto compatible cylinder heads.
Q: What comes in the kit?
A: Cylinder head cover, insert of your choice, and O-rings.
Q: Can this handle aggressive riding?
A: Yes. The design is made for strong, predictable performance under demanding trail conditions.
