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A "restricted" exhaust will not cause a lean condition. You really need to get your fuel mixture richer. "Soft seize" is overheating which these engines really hate. Even a slight overheat can nuke the lower end (bearings). If this bike has overheated to the point of stalling, you should IMMEDIATELY change the oil!
I highly doubt your jet is equivalent to a 1.190mm (#120) jet, as it would be super rich, and it would bog terribly and reek of gas.
spend the $3 on a #75 to #85 jet and get your shroud right, cooling is super-crucial to the JOG
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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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