Malossi uses the best materials for its shaft seals. They consist of steel cores covered with fluorinated rubber (FKM/FPM). The inner running surface, which has direct contact with the sealing surface of the crankshaft, is made of PTFE (polytetrafluoroethylene). Both materials are known under the trade names FKM and Teflon of the manufacturer DuPont. PTFE is extremely resistant to all acids, oils, greases, alcohols and fuels. Due to the increased alcohol content in today's fuel, shaft sealing rings with this material are recommended. In addition to their enormous wear resistance, they run with low friction, which makes them a must for all engines with higher speeds. Piaggio uses PTFE rings as standard in 125-180cc two-stroke engines such as the Runner or SKR. Also in the PX engines, the clutch side large shaft seal of the crankshaft is made of such a material (brown sealing lip).
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