Does the new engine have the same stator as the old one? The voltage regulator/rectifier must be changed if it does not have the same stator. Voltage regulators are sold by the number of "poles" a stator has. You must use the correct VRR.
Also; attach a heavy-gauge wire to one of the valve-cover bolts and connect the other end to a known ground on the fame. For some reason this "primary ground" is not mentioned on gy6 wiring diagrams, and is often omitted.
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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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