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new motor year?

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The single overhead cam "RFS" engine introduced in 400 & 520cc models in 2000, in 02 they added a 250, in 03 the 400 continued in Europe, the EXC/MXC got stroked to 450, the 520 (really 510) they relabeled 525 and they built a big bore short stroke 450SX.

The twin overhead cam "SXF" Engine was introduced in 250CC model in late 2005

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