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400ex weird sound

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I just bought a used 2007 Honda 400ex. Every since I tightened the chain I hear a weird rubbing sound that speeds up as I accelerate. It is tightened to spec. Any ideas?

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Your question is too vague, it could be anything. Take a close look at the chain and see if it is rubbing on anything. Also, check for proper chain alignment. Your axle may not be aligned straight and if it is at an even slight angle, you will get the sounds you are describing.

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It almost sounds like the chain is rubbing on the guard. Also, on the 400ex there are four carrier bolts and a large adjuster nut. I was under the impression (from the manual) that this setup was specifically designed to not allow misalignment?

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Check the torque roller bearing on the bottom front of the swingarm. Also if your trying to pull to high of a gear and lugging it, the chain will slap the top of the swingarm.

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