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The crankshaft oil seal leaking is 9 times out of 10 due to excessive play in the crankshaft bearing. This is a very common problem, found when engines oil starve, especially on the 139. You can attempt to replace the crankshaft seal, but I highly doubt it will fix the leaking.
Your engine is most like ruined, crank wobble, of even 1/1000" is enough to ruin the engine case bearing journals
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2011 Roketa MC-23-150
4T 150cc 157 qmj
24mm carb w 115 main jet and paper cone air filter
Manual petcock w Tygon fuel lines
Scrappy Dog Scooters Retro-slash stainless straight-thru exhaust
RED spring clutch
Adjustable CDI (brand unknown, it's blue and red and works great!)
KOSO high performance variator w 12g sliders
Gates Powerlink 835-20-30 belt
GPS verified 65mph on flats.
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