Description:
Transform your Royal Enfield 650 Twin with this high-performance 90mm Big Bore Kit. This comprehensive kit increases engine displacement from the stock 648cc to a massive 865cc, significantly boosting torque and horsepower for track and performance street use. The kit features high-quality forged pistons and a precision-engineered cylinder block designed to handle increased stress and compression.
Important Installation & Tuning Clauses
NOTE: This kit is Plug n Play. The cylinder block is ready to install directly.
MANDATORY: You need to map the ECU or add a piggyback fuel controller. Due to the significant increase in engine displacement (648cc to 865cc), the stock ECU fuel map will not be sufficient. You must use a piggyback system or a re-mapped Race ECU to ensure proper fueling and engine safety.
| Displacement | 865cc (Stock: 648cc) |
| Bore Size | 90 mm (Stock: 78 mm) |
| Stroke | 67.8 mm (Stock stroke retained) |
| Compression Ratio | 11.0:1 (High Compression) |
| Piston Material | Forged Aluminum Alloy (High Strength) |
| Cylinder Material | Aluminum block with heavy-duty iron liners |
| Compatibility | Royal Enfield Interceptor 650 / Continental GT 650 /Bear 650/super meteor 650/classic 650/Shot gun 650 |
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