BARREL AND PISTON SET BIG BORE 12/18HP > CONVERT 425CC TO 530CC, 66MM BORE TO 74MM BORE, NEARLY 25% INCREASE

With this 74mm 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 1200 mile run-in period during which you should avoid exceeding 45mph and 4,000 rpm. This gradual break-in process is crucial for optimal performance and longevity.

Additionally, it may be necessary to upgrade the carburettor fuel jetting.