Quiet knocking at temp???

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Quiet knocking at temp??? - 3/12/2005 3:13:22 AM

mach9

Posts: 192
Joined: 3/12/2005
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I have a '99 F4 and its currently making a odd sound. When the bike is first started and is warming up there are no odd noises...at least none I have heard so far, however, once the bike is warmed up I can hear a knocking sound...very faint at idle but more pronounced at higher RPM's. The higher the RPM the faster the knocking. I have heard a few possible causes but I was hoping someone else would have some ideas. I have heard it could be a lean fuel mix, carbon buildup, valve clearance. The bike currently has 30,000 miles on it, valves were adjusted by a dealer at 20,000. Any thoughts??? If you think its one of the above mentioned problems, any ideas on solutions, or possibly ways to eliminate causes? Would a faulty CCT cause this sound? Ive heard those seem to be a common problem among CBR owners.

< Message edited by mach9 -- 3/12/2005 3:18:27 AM >

Post #: 1

RE: Quiet knocking at temp??? - 3/12/2005 7:16:05 AM

mach9

Posts: 192
Joined: 3/12/2005
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What no one is up at this un-natural hour that has the answers to my problems?

(in reply to mach9)

Post #: 2

RE: Quiet knocking at temp??? - 3/20/2005 1:05:35 AM

mach9

Posts: 192
Joined: 3/12/2005
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Everyone seems to be an expert on things till I ask a question. Would a sound byte help? This is beginning to get annoying, I'm starting to think im gonna have to go talk to the dealer since I dont seem to have a mechanic friend around to ask. Perhaps ill just go enroll myself in UTI's program and learn the ins and outs of the whole damn bike.

(in reply to mach9)

Post #: 3

RE: Quiet knocking at temp??? - 3/22/2005 2:48:10 PM

JAA600

Posts: 10
Joined: 3/12/2005
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I'm thinking cam chain tensioner but without hearing it......

(in reply to mach9)

Post #: 4

RE: Quiet knocking at temp??? - 3/26/2005 3:10:38 AM

mach9

Posts: 192
Joined: 3/12/2005
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I'll post a sound byte when I get a chance..what gets me is that it doesnt make any noise when its cold, only after the temp comes up....that i can hear anyhow.

(in reply to JAA600)

Post #: 5

RE: Quiet knocking at temp??? - 3/29/2005 11:37:51 AM

Twowheeljunkie

Posts: 19
Joined: 3/16/2005
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my '95 F3 is doing something similar, at least by what you described. It sounds like a loose bolt/rattle but it only seems to happen when the bikes warmed up and is worst at idle (highest engine vibration). I was told its the cam chain tensioner which im replacing as soon as it comes it. Ill let you know what happens, do post a sound byte if you get a chance. Ill do the same if the weather isn't too nice adn im not in too much of a hurry

(in reply to mach9)

Post #: 6

RE: Quiet knocking at temp??? - 3/29/2005 12:02:27 PM

ride red

Posts: 11
Joined: 3/27/2005
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My guess is CCT. I have an 02 f4i and just last week changed the CCT and it cured my noise which was a similar noise to what you are describing. Does it seem to be coming from the right top side? You can take a long screwdriver if you don't have a stethoscope and put the handle to your ear and the metal end on different parts of the engine to attempt to locate where the noise is actually coming from. If it is the CCT, it was a tedious process to change out, but with average skills, you can do it yourself. Good luck and keep us posted.

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Post #: 7

RE: Quiet knocking at temp??? - 4/2/2005 5:06:27 PM

crossy

Posts: 5
Joined: 1/4/2005
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try cam chain tensioner anyway my f4 rattled at 3000 to 5000rpm AND on the backoff from a high rpm sprint (sounded like a big end bearing thumping) it was just the CCT what a relief i tell you~! crossy

(in reply to mach9)

Post #: 8

RE: Quiet knocking at temp??? - 4/3/2005 1:18:54 AM

rEdLyNeR

Posts: 244
Joined: 1/9/2005
From: Decatur,IL
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Definitely CCT or you might need to re-lash your valves. They may be fine at cooler temps (i.e. startup/warmup) but tolerances change when it gets hot. Thats where I would start anyway. Keep us posted....

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(in reply to crossy)

Post #: 9

RE: Quiet knocking at temp??? - 4/18/2005 8:36:27 PM

mach9

Posts: 192
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Well I ordered a CCT. Hopefully that will solve the problem. This is starting to piss me off....its 70 degrees outside and my bikes hiding from the sun in the garage.

(in reply to rEdLyNeR)

Post #: 10

RE: Quiet knocking at temp??? - 5/6/2005 2:43:54 AM

mach9

Posts: 192
Joined: 3/12/2005
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Bloody hell, i JUST got the CCT delivered...i swear that shouldnt have taken near as long to get ahold of....anyhow, havent had a chance to install it yet, have a week off work starting tuesday, so it will probably be then. Doesnt seem all that difficult to do. Hardest part will be pulling the valve cover and setting #1 to top dead center. The rest looks like a breeze. I'll let you know how it goes......

(in reply to mach9)

Post #: 11

RE: Quiet knocking at temp??? - 5/13/2005 4:02:48 PM

mach9

Posts: 192
Joined: 3/12/2005
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CCT is in, but naturally when I finished last night and went to turn it over it was dead as can be. Its been sitting on a charger all night, ill update this later and let you know if the CCT solved the problem....

< Message edited by mach9 -- 5/13/2005 4:03:31 PM >

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Post #: 12

RE: Quiet knocking at temp??? - 5/16/2005 4:03:05 AM

mach9

Posts: 192
Joined: 3/12/2005
Status: offline

Well that cured the problem, or seems to anyhow. Went for a couple quick sprints up the street and back, and it sat idling in the driveway for 10 minutes with no odd noises...i think my baby is fixed and back on the road. I'll know tuesday when i have the day off....

(in reply to mach9)

Post #: 13