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Aussie_650

Rattle on Start up?

4 posts in this topic

Could anyone tell me if they sometimes notice when their 650R, is first booted over in the morning a real distict tinny rattle coming from crank/clutch? It seems to disappear within ten seconds or so. Doesn't always do it. New donk only 3400 kilometres. If anyone can point out a reason/remedy it would be much appreciated. Once runnig everything is sweet, clutch etc.

Thanks in advance,

Aussie 650

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Thats hard to say what the problem is if any. Maybe lack of oil pressure at start up? I had a noise on my XR600 that bothered my for years. I took the motor apart and found it was the back lash in the crank to counter balance gears, No Problem. It just sounded like a bad rod.

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There have been several posts about this subject, and I believe the consensus was that the ticking that you are hearing is actually from the automatic compression release mechanism. If i remember correctly, the engine has to reach a certain rpm before it resets. Mine does it also, but goes away if you blip the throttle...which really isn't recommended on a cold engine, but I just barely crack it to make the ticking stop.

You might try a search on this forum and you'll probably come up with a lot more info.

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Does the rattle only occur at very low revs? (ie stalling point?) .The XR6 used to get a ticking noise happening at really low revs, this was caused by the auto decomp on the cam cutting in.

So if this rattle is only happening at a very slow idle it's probably your auto decomp. :)

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