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Which piston to use/buy 02 EXC 300?

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The KTM guys all seem to go OEM, but no one ever seems to give a good explanation of why OEM is better. I'm going to have to do my first top end on a KTM soon, and I have never used anything other than Wiseco in all kinds of Japanese bikes (street, dirt, big, small). I've never had a piston failure of any type (even with the extreme abuse my mini racer son dishes out). I'm probably going to go with a Wiseco for my KTM, as I like the idea of a forged piston for durability.

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Wisco pistons are forged where as stock or Vertex and Athena are a cast piston which do not expand as much so have a tighter fit with less rattle. I tried a Wiseco in my 2000 300 rode it one ride took it out because it rattled way too much sounded louder that my worn out stock piston. You can do what you want but that was my experience.

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