929 Metal Knocking sound - Honda Motorcycles - FireBlades.org
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post #1 of 25 Old 07-10-2013, 4:05 PM Thread Starter
 
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929 Metal Knocking sound

Hi everyone!

I bought a 2000 CBR 929 RED/BLUE/WHITE. The bike needs a lot of TLC

Work I already did:

- Fairing bolt upgrade
- new oil pan ( old one was cracked near the drain bolt)
- front brake new seals and pads.

but now, I noticed a loud metal knock on the upper engine side, side of the rear brake. Near the air box.

I uploaded a YouTube movie, which clearly lets you hear the noise.


The longer the bike runs, and gets hotter, the less frequent the noise appears.

When cold, every 3 - 8 seconds.

When hot, above 85 degrees celcius its every 15 - 30seconds.

I don't notice the sound when riding, might be because the helmet/street is louder than the knocking sound.

I can not hear the noise when engine is revving 4k+, Might be because exhaust note is very loud.

My main suspects are the CCT, because of the CBR 929 CCT history. But the knocking should be louder/more frequent when rpm's rise, right?

Other suspect is fuel pressure, as the noise appears less frequent when engine temp rises.

I can check the CCT but the position of the CCT on a 929 RR is pretty hard to reach.

Hope you guys/girls can help me.
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post #2 of 25 Old 07-12-2013, 10:19 AM Thread Starter
 
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Re: 929 Metal Knocking sound

Nobody?
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post #3 of 25 Old 07-12-2013, 1:28 PM
 
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Re: 929 Metal Knocking sound

assuming the bike was in neutral with the clutch lever out? does the sound go away if you pull the lever in?
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post #4 of 25 Old 07-12-2013, 2:12 PM Thread Starter
 
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Re: 929 Metal Knocking sound

No it does not go away when pulling the lever.
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post #5 of 25 Old 07-12-2013, 4:09 PM
 
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Re: 929 Metal Knocking sound

If it is the CCT it will disappear when the engine is revved. The CCT is nothing more than an auto-chain adjuster, these are known for making noise at idle when the system is not fully engaged. I have never heard one knock like that though. I would highly suggest getting it to a bike shop to have them check it out.

/**Serenity**\ 2002 Honda CBR954RR Fireblade

"But risks must be taken, because the greatest risk in life is to risk nothing. Only the person who risks is truly free."
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post #6 of 25 Old 07-12-2013, 6:03 PM Thread Starter
 
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Re: 929 Metal Knocking sound

It might be gone when I am revving hard to tell with all that noise and vibrations. Never noticed it while riding.

What would be the next thing on your suspect list if it is not the CCT?
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post #7 of 25 Old 07-12-2013, 6:27 PM
 
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Re: 929 Metal Knocking sound

something with the thermostat perhaps? a stuck spring maybe. or maybe the HTEV servo/cable is loose, or something else in the exhaust. maybe a baffle in the muffler rusted and fell off. or, you left a screw or a rock in the oil pan when you installed it.... just kidding on the last one.
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post #8 of 25 Old 07-12-2013, 6:28 PM Thread Starter
 
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Re: 929 Metal Knocking sound

Can you please elaborate about "something with the thermostat" ?
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post #9 of 25 Old 07-12-2013, 6:31 PM
 
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Re: 929 Metal Knocking sound

thermostats have a spring to hold them closed, then once they warm up they get pushed open by a wax pellet (at least on cars) so if there were something wrong there, perhaps it is opening then snapping back shut? or something mechanically inside it that is binding. i am totally guessing here, reaching quite a bit.
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post #10 of 25 Old 07-12-2013, 6:34 PM Thread Starter
 
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Re: 929 Metal Knocking sound

I'll check the service manual to see how it works and what moving parts can misbehave. Thanks
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post #11 of 25 Old 07-12-2013, 11:10 PM
 
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Re: 929 Metal Knocking sound

I was thinking a rod... but it's not consistent as it would be with a rod. Could be rockers, but again I would think this would be more consistent. Sounds like metal on metal which is never good... Rev it up just a little bit while parked, the CCT should kick in at almost anything above idle. Hell, it could just be a dead CCT chain hitting the cover...

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post #12 of 25 Old 07-17-2013, 8:38 AM Thread Starter
 
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Re: 929 Metal Knocking sound

A dead CCT chain hitting the cover? Then the engine would not run I guess?

Today I received a new CCT + gasket. But during installation I noticed a deteriorated fuel line which had to be replaced ASAP.

When I receive that new fuel line, I will try and see if the new CCT is able to fix the ticking noise. I'll keep you all posted.
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post #13 of 25 Old 07-17-2013, 11:34 AM
 
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Re: 929 Metal Knocking sound

or it could of been a stunt bike before and part of the motor wasnt getting oil due to wheelies
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post #14 of 25 Old 08-13-2013, 1:09 AM
 
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Re: 929 Metal Knocking sound

Dafu, any update? Is knock present with new CCT? My 929 makes exact same sound since almost new, but not as often. Has 34k mi now, so i'm not worried. It's not the HTEV, since my bike sans HTEV. Sometimes the rpm drops at same time as knock.

There have been posts that sound similar , like this https://www.fireblades.org/forums/honda-fireblade/89613-wierd-clunking-noise-honda-cbr-954rr.html or https://www.fireblades.org/forums/honda-fireblade/93261-929-knocking.html


...2bits

Last edited by 2bitsamile; 08-13-2013 at 2:37 AM.
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post #15 of 25 Old 08-13-2013, 8:46 AM Thread Starter
 
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Re: 929 Metal Knocking sound

I replaced CCT and knock is still present. I have not noticed rpm drops when he "knocks".
I looked into the oilpan and noticed a lot of metal "dust/grind".

I'm thinking broken cams or something wrong with the valves. The noise comes from the upper right side of the engine. Location of the cam chain,the cams and the valves.

I have no idea what to do next,without spending too much money.
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