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2000 Honda 400EX Backfires

Trent Finnessey

By Trent Finnessey
in Honda ATV Forum

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Trent Finnessey

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I’ve got a 2000 400ex with a dg slip on muffler, it came with he stock muffler on it but the previous owner had the dg in a box so I put it on. I’ve been riding it for the past month and a half and every time I let off it backfires, and the other day the backfires got way louder, 2x louder! I’m concerned that I may hurt my motor? Why does is backfire??? Thanks

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