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Everybody has an opinion on 400ex's burning oil. As my dad would say because ur to hard on it kid! No No No! 400ex is a very robust engine i personaly dont think you can hurt one by being to hard on it! There built for racing! The reason they burn oil is because to start with they run very very HOT! There a 400cc moter thats a big ass moter to be cooled by air! And over time the heat wears things out and worrps parts. If its burning oil temparary solution run thicker oil like 15w-50 but you will eventualy need a top end rebuild (rings, valve seats) bout 200 bucks if you do the labor yourself! thats why your 400ex burns oil so fast u need a fresh top end.

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13y ago

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