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04WR450man

WR450 Engine noise - Help!

9 posts in this topic

Hi all :smirk:

My 04 WR450 has developed a strange noise, I was wondering if anyone can suggest anything to check before stripping her down? Its a clatterery type noise that is most noticeable holding the engine at constant revs ie. riding at 30-40mph in 5th gear.

Basically, it has only done a handful of rides after being apart due to a 5th gear problem (dogs worn out). It is still running perfectly but it has developed this strange vibration/noise.(It came all of a sudden). I cant tell where its coming from, So far I have checked the valve clearances, they were fine.

Next I checked the primary nut on the clutch side, seemed nice and tight but the shaft does have in/out play in it and the clutch hub/basket has play too. My manual doesn't say much about this, could this be my problem? How much, if any, is a normal amount of play in this area?The noise is the same with the clutch depressed.

Could it possibly be a bad little end, or big end/crank???

Any suggestions would be greatly appreciated!!!!

Many thanks

Trev

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Hi,

Thanks for the reply :smirk: Yes I do, always have had one. Unfortunately the noise does not go away when you take it off, already tried that!

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Hi, thanks for the reply :smirk:

No, the vibration really is not that bad, its more the noise. I know they are naturally quite noisy anyway but this a step above that. (I have had two WR's)

I have been playing with it today and when you rev the engine in neutral, i am sure I can hear a tap tap tap as the revs come back down, which it definitely did not do before.

Many thanks

Trev

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Hi, thanks for the reply :smirk:

No, the vibration really is not that bad, its more the noise. I know they are naturally quite noisy anyway but this a step above that. (I have had two WR's)

I have been playing with it today and when you rev the engine in neutral, i am sure I can hear a tap tap tap as the revs come back down, which it definitely did not do before.

Many thanks

Trev

Rattles, knocks, or vibrations on deceleration usually indicate a rod bearing or wrist pin problem. Has this engine ever been apart?

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Hi,

Yes it was apart not that long ago to replace 5th gear. There was zero play in the bearings, but I suppose anything could of happened since then.

Looks like stripping it down is the only way I can go. I take it play in the clutch basket & movement in the primary shaft is considered normal then?

Thanks

Trev

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Hi,

Yes it was apart not that long ago to replace 5th gear. There was zero play in the bearings, but I suppose anything could of happened since then.

Looks like stripping it down is the only way I can go. I take it play in the clutch basket & movement in the primary shaft is considered normal then?

Thanks

Trev

A little end play in the mainshaft and countershaft is normal but if it's much more than .010" (.25mm) I'd be looking closely at that too.

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