Crankshaft tuning RMS for scooters equipped with 50cc vertical air-cooled Minarelli engines - Aprilia Amico / Italjet Pista 2 AC / Scoop / Yankee / MBK Booster / Stunt / Sorriso AC / Target / Rex Escape / Rexy / Silverstreet / Yamaha BW's / Bump / Beluga / Slider / Spy / Zuma.
Recommended for big bore kits or for increasing the performance of the original setup.
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