405 Big Bore Kit 999-025



405cc Big Bore Kit. 999 025. All 348 Engine Variants.

For more information and to see the engine being assembled and then ran on the test bed click on the following link:


Kit comprises of:
405cc Nicasil Plated Cylinder

Sportax 405 Piston Kit. Includes Rings, Circlips and Pin

Base Gasket

3x Cylinder Head O Rings

Cylinders will be supplied in their bare metal finish and can be powder coated satin black for an extra £50.

Please email or call for further info regarding your new 405 upgrade kit specification.

Additional information

Exchange Item

Exchange Cylinder