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how do i find out what mods my SX 520 has?


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i just bought a 2001 520 sx and my friend that i bought it from says the original owner was a bigtime hillclimber.....he says he knows there is stuff done to it but he doesnt know what.....how do i find out? because it looks bone stock but i guess it could have a big bore kit?....please help..thanks

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You can measure the stroke with a straw in the spark plug hole, but you would need to pull the head to check the piston for the bore size. A compression check wouldn't help here, other than to determine if the engine needs rings and/or valves.

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