tHE DIO MOTOR IN THE ZX 50 IS MADE BY HONDA,90 MPH IS THE EXTREME,FOR A GOOD SWIFT KICK IN THE AS...,A 70 CC KIT WILL DO GREAT,AND IT WILL BANG 55-60 DEPENDING ON YOUR WEIGHT,BUT THE 110 CC KIT IS A BOLT IN KIT ,EXPENSIVE?YES,WORTH IT ON A STREET SCOOTER?NO, BIG BRAGGING RIGHTS?YES,TOO FAST? YES, GAS HOG,YES,FUN? WELL IF 20 HP SOUNDS LIKE A BLAST COMPAIRED TO THE 3.5 HP IT CAME THEN THERE YOU GO.....