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2001 yz 125 normal wear or not?

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I bought a 01 yz 125 a couple weaks ago and within 30 minutes of riding it blew up. Now I have boughten a used cylinder and a wiesco piston. When I started it made this ratling noise but then it quit once I put the choke on , but now the bike has run for probably 1 minute and when I took the pipe of to look and the piston there were marks. Are these normal or not? My finger nail doesn't catch in them the last to are if the old piston and cylinder, the exhaust port was cracked all the way throughimage.jpgimage.jpgimage.jpgimage.jpgimage.jpgimage.jpg

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