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It's slow because you were trying to go in a straight line. To go fast on one i think you need to turn alot, at least thats what the other z owners say. Or you made a mistake and rode another sport quad first , in that case your screwed and it will always seem slow. J/K
Do what you have done to your DS to your Z....for example...new carb (FCR 40mm), new ignition (Dyna/Vortex), new exhaust, air filter, ported intake, and then come back and say its slow.