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NOTES: #1: WHEN MOUNTING THE PISTON ON THE HEAD OF THIS ONE IS MARKED (IN) OR (N) PLACE IT TOWARDS THE TOP OF THE CARBURETOR SIDE #2: WHEN ADJUSTING THE TIMING (5.26) ON YOUR BELL PLACE YOURSELF ON THE MARK (T) (I was testing an ignition advance adjustment) part: 1 disassembly tutorial: • mechanics tutorial: changing a piston / disassembly... valve adjustment tutorial: • mechanics tutorial: checking / timing / r... Facebook: https://www.facebook.com/Moto63-by-li... This tutorial explains how to disassemble a dirt bike top engine and change a piston, it's the same process for 125, 140, 150, pit bike and dax. I hope you like this video, feel free to comment and like the video ;-)