The Aprilia SXR50 is a sporty-looking moped, but its legally-limited performance is not going to set many pulses racing. So Italian tuning firm Polini has developed a range of performance-enhancing bits to add a bit more pep.
A big-bore cylinder kit will increase engine capacity to 80cc, with a commensurate boost to performance. It’s got a cast iron barrel, an aluminium cylinder body, a 49mm piston, and retails for £216.
The next recommended step is to fit a performance variator to improve acceleration, and Polini’s £67.40 kit promises improved top speed too. To get the best out of it, there’s a new ECU which comes with new valve springs that allow the rev limit to increase to 10,000rpm – SRP is £276.
To enjoy the benefits of all this extra power, a longer secondary gear kit can be fitted which will up the top speed by 20% thanks to a new 15-54 ratio. It costs £90 SRP.
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