Knocking when cold at idle rpm's - Honda Motorcycles - FireBlades.org
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post #1 of 28 Old 10-08-2008, 3:48 PM Thread Starter
 
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Knocking when cold at idle rpm's

This just started a couple weeks back. I get this knocking noise on cold start-up. It only does it when it sits a couple hours then start it again. After its warm and Im off riding it quiets down almost all the way, if not completely. Its pretty loud and kinda scares me. The sound pretty much came from nowhere. It sounded normal one day then noisy the next. Ive read numerous posts on noises. Might go ahead and replace the CCT just for kicks. The bike has almost 28,000 miles on it. I wrecked the bike back in Nov 07. Put 6,000 miles since then. After the wreck it sat for a couple months and it sounded like more noises were around than before the wreck. It might just be a paranoia thing. Anyhow if you have any suggestions I would greatly appreciate it as I am going to my first track day at Putnam on Oct 19th. I might just wait till after then to start tearing into it so I dont screw something up. Thats how my luck goes...


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post #2 of 28 Old 10-08-2008, 4:41 PM
 
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Re: Knocking when cold at idle rpm's

Is it coming from one side of the engine or equally from both sides or what?
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post #3 of 28 Old 10-08-2008, 4:56 PM Thread Starter
 
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Re: Knocking when cold at idle rpm's

It sounds like its coming from both sides, the middle or something. But I haven't took the fairings off to investigate further yet.

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post #4 of 28 Old 10-08-2008, 5:00 PM Thread Starter
 
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Re: Knocking when cold at idle rpm's

I didn't mention it but I also have this buzzing noise around 4k rpm or so in every gear. Like its coming from a loose fairing. Doesn't sound like its coming from the motor though. But that sound is like right under the front of the gas tank. I replaced the spark plugs about 10,000 miles ago. I had a spark plug come loose on my F3 a long time ago and blow out the cylinder. I need to make sure they are tight, that might just end up being this buzzing noise....

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post #5 of 28 Old 10-08-2008, 9:13 PM Thread Starter
 
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Re: Knocking when cold at idle rpm's

Ok scratch the buzzing. I put on a carbon front fender on a few weeks ago and found out that its the buzzing. But the more important knocking noise, well I cant figure it out. I started it up a minute ago and the knocking sounded like it it was coming from the lower case. Exactly what I didnt want to hear. I bought the bike with 4900 miles on the odo. Ive kept the maintenence up on great. Other than not checking valve clearances. Synthetic oil since I bought it.

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post #6 of 28 Old 10-09-2008, 2:20 PM
 
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Re: Knocking when cold at idle rpm's

Is it really knocking like predetonation of your gas or is it the loud clicking of a chain or what? Can you describe the sound any more specifically?
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post #7 of 28 Old 10-09-2008, 2:32 PM Thread Starter
 
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Re: Knocking when cold at idle rpm's

Is there anyway to post a video? Hmm I hate describing sounds. It might be like a predetonation. It sounds like something is loose and banging around. Maybe like a hammer hitting the case. There is no pattern to the sound. Real random knocks.

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post #8 of 28 Old 10-09-2008, 2:34 PM
 
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Re: Knocking when cold at idle rpm's

If you can, just post the vid on youtube and link it here. If noone else responds, you may also want to post this in the general discussion thread also, alot more mechanically inclined people frequent that thread.
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post #9 of 28 Old 10-09-2008, 2:36 PM Thread Starter
 
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Re: Knocking when cold at idle rpm's

One more thing. When I whack the throttle open theres a knock type noise. If I roll the throttle from idle real smooth theres nothing.
These are seperate noises btw. At least thats what I think.

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post #10 of 28 Old 10-09-2008, 2:41 PM
 
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Re: Knocking when cold at idle rpm's

I would suggest a video of the sound at this point. Knocking, tapping, clacking, ticking, etc are all different noises....
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post #11 of 28 Old 10-09-2008, 10:09 PM
 
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Re: Knocking when cold at idle rpm's

what octane gas are you running? the throttle roll on you describe reminds me a little of predetonation.
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post #12 of 28 Old 10-10-2008, 12:22 AM Thread Starter
 
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Re: Knocking when cold at idle rpm's

I use premium all the time. 91 or higher. Ill try and get a video tomorrow and post it.

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post #13 of 28 Old 10-10-2008, 5:03 AM
 
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Re: Knocking when cold at idle rpm's

if the nose goes away at hi rpms then chances r its the timin tenchener (im not a good speller lol ) replac it with a a.p.e one its ajustable .............im a bike mechanic and that happens alot with the 954 929s the part is only 65 bucks thtas it for shore if u call me and put the phone n ere the bike i can really give u a better diegnos 732 921 6378
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post #14 of 28 Old 10-10-2008, 3:55 PM
 
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Re: Knocking when cold at idle rpm's

I had a buddy that when get got under throttle it would knock...eventually leading to a blown motor on his R1. I would suggest you have a mechanic take a listen just to be sure.
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post #15 of 28 Old 10-10-2008, 5:32 PM Thread Starter
 
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Re: Knocking when cold at idle rpm's

Well I got a video. Actually 2. This is the first one. Of course when I take a video its not really present. You can kinda hear it near the end of the vid. The second video Ill post in a minute. In the second one I just hit the throttle and you can hear the weird noise. Thats what it sounds like when I start it up usually but all the time not just when I hit the throttle.
YouTube - 954 knocking issue

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