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That's not a "B" variant, the two variants are "P" and "B" and they read like this " 1B57" or "1P57". The "b" engine is also called an "extra-longcase" as it is significantly longer than a "longcase" to fit 16" wheels. The 'P' variant has larger valves and a taller head, resulting in nominal low-end power gains over a regular 157.
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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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