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Sounds to me like you didn't break it in right and you mis-seated the rings. You really gotta break them in correctly ESPECIALLY with a BBK.
My brother put a BBK on a 139, and decided to "whomp on it" and "break it in hard", commonly going at full-throttle, riding two people, and just generally riding very hard BEFORE he had 500 miles on the BBK. Blew the rings, and smoked and then lost compression steadily, which got worse everyday until the engine wouldn't start anymore and has 45lbs compression.
People keep saying ignorant things about break ins, but you do it wrong=waste your BBK, and that's a FACT.
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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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