POLINI oil seal overhaul kit 285.0007 crankshaft PTFE/FKM 15 X 24 X 5 for minibikes

POLINI oil seal overhaul kit 285.0007 crankshaft PTFE/FKM 15 circulation. Perfectly interchangeable with the originals, they can be mounted both on the crankshaft and on the primary shafts of CVT transmissions. Made of FKM (fluorocarbon rubber) to resist the highest thermal stress, they have a sealing lip coated in PTFE (polytetrafluoroethylene); this feature, in addition to making them more durable than standard sealing rings, means that they have a significantly lower friction coefficient, thus guaranteeing less dispersion due to friction and at the same time maintaining lower temperatures. These sealing rings were designed for racing engines but are also perfectly suited to standard engines without upgrade kits where, due to the low power available, the reduction in friction allows higher rotation speeds to be reached. TECHNICAL FEATURES Body in FKM. Steel metal armor. Internal lip coated in PTFE with very low friction coefficient