re: My 13 1/2 year old son wants a 450 four-wheeler…

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The size of the 4-wheeler isn't that big a deal. It's more about their ability to operate a wheeler safely. A 250 can jack a kid up same as a 450 if they don't know what they're doing.

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This is the answer you are looking for.

Both of my sons have grown up riding 4-wheelers and dirt bikes. I could let them ride my Honda Foreman 500 when they were 7-10 (under supervision).