8 or 9g weights are stock on the 1p40, regardless of bike size.
I found 5g to be the best for my E-Ton. My 139qmb bikes like 6g, and my kymco Yup 50 2t likes a mixture of 4 and 5g weights.
I run strictly sliders as they grant you more low and mid-range acceleration.
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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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