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climaxx dirtbikes

New 07 450 knocking...?

15 posts in this topic

I changed the oil for the third time with non-syn recently and put a new aluminum skid plate on. I expected a little more engine noise but not this loud knock. Is this normal because of the skid plate. Oil level is perfect and still really fresh only 4 hrs on it.

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I'll go out on a limb here and gurantee that what you are hearing is your chain slapping on the swingarm slider. Make sure your chain is properly adjusted.

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My '09 WR450 sounds like a rock crusher at idle compared to other bikes...but runs like a dream. Seems all 4 stroke Yammies are like that. I've had Yamahas for 30+ years and they all sound like that.

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Mine sounds like a rock crusher too. The sticky says this is normal unless there is a big hole in the case to let rocks in.

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I have a new 2008 (about 12 hrs) with an aluminum skid plate - with the same noise. Kind of a heavy knocking which is worse when the clutch is engaged (lever out). Took the plate off for the oil change - rode around the yard and it was much quieter.

Figure it's the normal noise- and I'll have to get used to it (or get some ear plugs!)

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