Here's the deal with BBKs;
1) You'll have THE SAME top-end, you'll just reach it faster, you WILL NOT climb hills better or faster.
2) The 139 engine is NOT stable with a 100cc BBK, it is TOO THIN in the "jug" and prone to over-heating, GREATLY reducing longevity of engine.
3) It's not an easy job to do a BBK. In fact, I have seen only two people without engine/mechanical backgrounds succeed in installing a BBK.
4) Most BBKs are very low quality. There are good kits, like the Tadia and the Malossi, but most are serious garbage.
5) A BBK is a complete waste of time without all other mods done FIRST. A BBK will not improve your bike's performance without properly tuning the engine, carb, and CVT. Therein lies the rub; as you gain a whole lot of performance with modded ANCILLARIES. I'd do the ancillaries FIRST, then determine if you want a BBK.
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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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