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  1. Engine/EFI/Drivetrain
    I upgraded a trx400ex engine to the highest possible power output without a 460 kit. A complete Wiseco bottom end, 440 13:1 Wiseco top end, Advanced aluminum sleeve, ported polished head, Kibblewhite valve set with +1mm springs, stage 3 Hotcams cam, trx450r carb, 105 octane fuel, a CDI with the...
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