ProX Crankshaft Bearing and Seal Kit KTM250/350EXC-F 17-23 CRANKSHAFT BEARING and SEAL KITS: ProX crankshaft bearings and seals are manufactured at leading OEM factories, mainly in Japan. All bearings and seals are made to exact OEM specifications, to ensure maximum quality and performance. ProX uses respected brands like Koyo, NTN, NOK and ARS to ensure quality. These brands are used by OEM brands like Yamaha, Kawasaki, Honda, Suzuki and KTM. ProX bearings offer high durability and the seals make sure to keep the oil in and dirt out of the engine. ProX Crankshaft Bearing and Seal Kits offer you reliability and carefree driving. The sets contain all parts you need for rebuilding your crankshaft and can be used in combination with all other ProX or OEM crankshaft related products. Next to the high quality ProX connecting rod kits the Crankshaft Bearing and Seal Kits are completing the crankshaft parts program. These new sets will be the easiest and best replacement for your Dirt bike, ATV and PWC.