(UPGRADE) High Temp+Double-Lipped Crankshaft seals.
Not only do the stock ones wear out like erasers, but they only have one sealing lip and (Worst!) pop in/out of their holes way too easily! Without enough press fit, they constantly slide out of place without anyone knowing if the motor ever pops/backfires- causing air leaks, (ie. bad idle suddenly!) and/or the drive gear to eat up the rubber seal.
Even the small attraction from the magnetic ignition rotor sometimes slides regular ones loose!
These have plenty of press fit (don’t worry, still easy enough to install with a socket and piece of wood/hammer!) and I wouldn’t mind refunding anyone if one does ever slide out! I’ll just have to trust your installation haha
[Thinner seal goes on the left (magneto) side of the bike]