Barrel and piston set big bore 12/18hp > 530cc

With this Big Bore cylinder kit, you can increase the displacement to 530cc, achieving a compression ratio of 8.5:1. This enhancement results in a significant boost in horsepower and torque for the engine. The piston and cylinder dimensions adhere to Citroën's original specifications, ensuring proper fit and performance. Notably, the cylinders are newly cast and not retrofitted or drilled-up old cylinders.

Please be advised: the installation of a new cylinder set requires a careful run-in period. We recommend a 2,000-kilometer run-in period during which you should avoid exceeding 70 km/h and 4,000 rpm. This gradual break-in process is crucial for optimal performance and longevity. Additionally, there is generally no need to replace the carburetor nozzle with this upgrade.