I never ride mine at WOT as it would be going 65 to75 mph and that is unnecessary as I am not allowed on limited access highways.
A gy6 150cc should easily do 50mph at 6500rpm. Riding at WOT is extreme;y bad for ANY engine, not just scooters, NOTHING is designed to run at WOT.
And no, it is not true that 'every scooter owner' will need to replace/rebuild their engine at 6000 to 7000 miles, I've broke 10k miles on three gy6 bikes, and had no inner engine problems at all.
The key to engine longevity is proper maintainence and not abusing it. A 232 is FAR more sensitive and fragile than a stock 157, and will be even more susceptible to inner engine damage if ridden at WOT. It also isn't that much more powerful than your stock engine, only about 6hp, it will not make your bike have a higher top-speed as that is determined by the FINAL DRIVE gears, which limit these bikes to around 75mph maximum.
My current bike has no internal engine mods and easily hits 60+ mph.
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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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