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Old 11-05-2013, 06:08 PM   #4 (permalink)
euromodder
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GasDwarf - '13 Volkswagen up! EcoFuel CNG
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If it feels smooth as an electric yet tops out at a mere 55mph, the gearing will be on the short side.

I wouldn't change the intake or exhaust, but make the gearing a bit longer and sacrifice acceleration for higher speed and lower rpm throughout.

I'd expect a modern 125cc to top out around 65-68 mph.
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