Knocking noise from engine - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 22 (permalink) Old 04-06-2012, 09:33 PM Thread Starter
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Knocking noise from engine

http://www.youtube.com/watch?v=1RnOg...ature=youtu.be

Idle part in the video 2:40

Hi Guys, i have a knocking noice from the engine, im not sure if its serious or can it be ignored, im suspecting shim replacement, if you guys can give me your thought form the engine sound it will be great, Thanks guys..
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post #2 of 22 (permalink) Old 04-06-2012, 10:52 PM
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Honestly so hard to tell from the vid...my guess is it's top end? Cam or follower maybe the gear drive assembly.

No so sure though I think your best bet is a qualified tech.



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post #3 of 22 (permalink) Old 04-07-2012, 07:25 AM
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Without hearing it in person, I'd guess valve adjustment. How many miles are on this bike and have you ever had them adjusted?



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post #4 of 22 (permalink) Old 07-01-2012, 07:30 AM
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Curious if you found the source of the knock? I have an 00 RC51 with the same noise. Just had the Honda shop shim the valves and the noise is still there. They think its a bearing in the lower end or worn gear.
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post #5 of 22 (permalink) Old 07-01-2012, 08:54 AM
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Hopefully your hide will outlive your engine...

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post #6 of 22 (permalink) Old 07-01-2012, 08:34 PM
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From what I can understand from the video, which is very bad audio quality, this noise comes definitely from the bottom end. It's either a con rod bearing or the clutch basket's connection with it's primary drive gear attached to it.
Either way it is time to take the engine apart I think.....I know I would.
Maybe you take it to another couple of dealers to hear it out too.
Good luck with that....


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post #7 of 22 (permalink) Old 07-01-2012, 09:34 PM
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I've actually had it at (2) dealers. First one said it was a normal sound (all RC51's are loud etc etc), second one said bottom end noise. Doesn't sound right to me, seems like the noise is coming from the clutch area. Trying to find another RC close to me to listen to before I tear it open. Any chance it could be a worn gear?
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post #8 of 22 (permalink) Old 07-01-2012, 09:44 PM
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When you pull the clutch lever in, is there any difference?

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post #9 of 22 (permalink) Old 07-01-2012, 09:48 PM
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Nope. Oil changes have been clean too. Sound does not get louder when you rev it like a rod knock would.
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post #10 of 22 (permalink) Old 07-01-2012, 10:55 PM
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Quote:
Originally Posted by MakisRC51 View Post
From what I can understand from the video, which is very bad audio quality, this noise comes definitely from the bottom end. It's either a con rod bearing or the clutch basket's connection with it's primary drive gear attached to it.
Either way it is time to take the engine apart I think.....I know I would.
Maybe you take it to a couple o other dealers to hear it out too.
Good luck with that....
The audio in the video is too vague to determine the source of the sound.
But I do hear some sort of repetitive sound in the under-tones.
My first thought was con-rod as well. Then I wondered if the clutch basket needle bearing might be bad as well.
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