Jetprime - Precision Control, Supreme Quality Jetprime High Compression Pistons for BMW R1200GS Bore: 101mm Bore: standard Capacity: 1200cc Compression ratio: 12.5:1 Piston weight: 352g These high performance pistons are made from specially selected materials of the lightest alloy metals to ensure a minimum level of product expansion and a very high level of product reliability. The pistons have been produced so that no other modification is necessary and they retain the same low noise levels. The lower unit weight of these products allows for an exciting level of acceleration with greater compression which increases the pull in the lower revs by keeping them more even as you accelerate. The kit is supplied with all necessary fittings. Part No. JPPHC003 Model compatibility BMW R1200GS 2010 - 2013 BMW R1200GS Adventure 2010 - 2013