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Not talking about tearing the engine down for a big bore kit. Just making the engine produce a little more power and changing the rollers in the cvt for lower gear ratio. It's not a hard task and the only special tool needed is an impact gun to remove the variator. Larger dia. tires will create a higher speed ratio making it harder to get under way from a stop. Lighter rollers will keep the cvt in low gear for longer. A combination of lighter rollers and stiffer main spring behind the clutch works best. A performance DC-CDI will really wake that engine up along with a UNI air filter and larger main jet in the carb. I know it's for your son and you probaly don't want to mod it to much for his saftey, but you don't want him to get bored with it either. There are plenty of members on here along with upgrade vids that can walk you through it.
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DITTO what WJL said...
...i don't know if i would want to chance the sheet metal screws in the tires plan... 
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07 HH250SS
UNI
HIT CLUTCH
DR. PULLEY VARIATOR
RED MAIN
17g ROLLERS
12T/45T SPROCKETS
IRIDIUM PLUG
HP CDI & COIL
LED LIGHTS
ASW CARBIDE
UNI
12g SLIDERS
RED MAIN
39T SPROCKET (coming soon)
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