rope-plugs are perfectly fine for scooter tires. But if you wanna get fancy, you can use a metal and rubber plug, but those must be installed from the inside of the tire so you have to dismount one side of the tire from the rim to install them.
No the 70's will not fit a gy6 longcase, they are too tall.
And lastly 70's will not increase your top speed.
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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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