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Old 12-23-2012, 03:57 PM   #1 (permalink)
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Default Engine suddenly stops making noise?

I've passed 30,000 miles on my 07 ZX6R now... I've had it into several shops and dealerships for the noise from the top end. It's sounded this way for 2 or 3 years now, like it's starving for oil. Just a metallic clackity-clack that's extremely loud on a cold start, and gets quieter as the engine warms up but is still present when warm, along with a persistent vibration from the engine.

5 days ago I walked outside to warm her up (my usual procedure I started *because* of the noise, despite living in FL), and I thumb the starter and nothing. Quiet as a whisper. Engine sounds healthier, doesn't make a single tick or clack despite being started at 38 degrees outside yesterday.

And the vibrations are virtually gone, all but what I'd consider "normal" are present. As if overnight, some dodgy mechanic had taken my engine apart and repaired it, leaving no signs of his handywork. I'm baffled. I've put new running gear on it but it's not that. The only "change" I made with the engine is having the dealership do my oil change (it was in for the valve cover recall) and they put on an OEM filter and Kawasaki Full Synthetic oil.

But I've always run ONLY full synthetic in it, usually with a K&N filter. Furthermore, the oil change was done several weeks ago and this just happened in the past 4 days.

I've been thinking CCT...do you think the CCT was stuck and finally adjusted correctly? Or that something broke, perhaps a chain guide, and is jamming the thing up tight? First thing I did was take it out and rev it over 10...not to the moon..but enough to say that I don't hear any sort of whine or anything that feels off.

Gift horse, or Trojan horse?
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Old 12-23-2012, 06:14 PM   #2 (permalink)
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Cct. probably has happened multiple times through the duration of ownership. You noticed it this time because you are looking for something to go wrong due to the service.

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Old 12-23-2012, 06:22 PM   #3 (permalink)
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It hasn't been quiet in about 3 years. Even when I thought it might've gone up a notch, it still clacked and made noise. When I let someone test drive it, the response was always the same 'Dude, SELL that thing, the motor's gonna let go.'

This is the first time it's not made noise since like 12,000 miles.
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Old 12-23-2012, 09:16 PM   #4 (permalink)
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At 30k miles your cam chain probably stretched a tad, which was enough for the cct to click teeth and remove the slack
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Old 12-23-2012, 09:53 PM   #5 (permalink)
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It's probably piston knock. The pistons are just sloppy in the cylinders and as it heats up the clearances get smaller as the rings expand. With it being 38 degrees out the cylinder sleeves had probably thermally contracted consuming the clearance. As the ambient air heats up again I suspect the knock will come back.

It's just your engine wearing out, but it's not going to explode under you or anything.
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Old 12-23-2012, 10:05 PM   #6 (permalink)
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It's probably piston knock. The pistons are just sloppy in the cylinders and as it heats up the clearances get smaller as the rings expand. With it being 38 degrees out the cylinder sleeves had probably thermally contracted consuming the clearance. As the ambient air heats up again I suspect the knock will come back.

It's just your engine wearing out, but it's not going to explode under you or anything.
Or will it? O_o

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Old 12-23-2012, 10:06 PM   #7 (permalink)
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Originally Posted by cookiebug79 View Post
It's probably piston knock. The pistons are just sloppy in the cylinders and as it heats up the clearances get smaller as the rings expand. With it being 38 degrees out the cylinder sleeves had probably thermally contracted consuming the clearance. As the ambient air heats up again I suspect the knock will come back.

It's just your engine wearing out, but it's not going to explode under you or anything.
Great idea and I would think you'd be right except the fact that this weather snap happened quite suddenly, and for the first day and a half it was quiet, it was in the high 70s, and then plunged to 38 over night, got a little colder the 2nd day, then started warming up...

It's not a sloppy noise so much as it is a scraping and clicking one. Like when I first heard it, I thought bad cam bearing. I've been thinking maybe a chain guide was hitting and just came off.... I just would've thought the dealer would notice something like that if they had the valvecover off for the warranty repair.
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Old 12-23-2012, 10:19 PM   #8 (permalink)
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Its better now than it was, take it for what it is man. You are the first person I have seen that is worried by improvement!

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Old 12-23-2012, 11:23 PM   #9 (permalink)
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i'll put my money on CCT self adjustment.
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Old 12-24-2012, 12:43 AM   #10 (permalink)
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Could always listen around the engine with a screwdriver for anything untoward.
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