The athena big bore cylinder kit for hm moto cre-f 450r 2005-2007 is part of the latest collection from athena.Features: all the cylinders are entirely engineered in italy by athenaâ s r&d department which has a strong internal know-how and cutting-edge tools to design and test each piece they are coated with motor-nicksil, a nickel-silicon coating developed by athena to obtain smoothness and optimal wear resistance the kit includes the high-quality aluminum cylinder with increased bore, the complete piston with the piston pin and rings, and all the necessary gaskets this cylinder kit can be installed without making any changes to the engine crankcase specifications: bore size: 100.00 Mm color finish: silver compression ratio: 11.6 Displacement: 490 cc engine type: 4-stroke product name: cylinder kit style: big bore units: kit to fit: hm moto cre-f 450 r 2005 european models hm moto cre-f 450 r 2006 european models hm moto cre-f 450 r 2007 european models hm moto crm-f 450 r 2007 european models honda crf 450 r 2002 all models honda crf 450 r 2003 all models honda crf 450 r 2004 all models honda crf 450 r 2005 all models honda crf 450 r 2006 all models honda crf 450 r 2007 all models honda crf 450 r 2008 all models manufacturer part number: p400210100001view all athena. View all parts and spares.