ATHENA Cylinder Kit Ø77mm Yamaha YZ250F (14 15) WR250F (15 18) This high quality gear lets you This high quality gear lets you feel nimble yet has durability that destroys those flimsy 'race graphic pajamas' offered in this category by other brands Honda CRF150 07 16 CR80 85 98 07 CR125 250 92 03 CRF450 02 03 the barrel with nickel silicon coating pressures and stresses and have been validated by Athena technicians with severe bench and road tests