knock knock knock ???

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JoKDX220r
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knock knock knock ???

Post by JoKDX220r »

Hi all,
After a ride in a lot of single track, my engine started to make a weird sound.... as the RPM goes down it always make the same 3 knock knock knock :shock: just before it get back to idle.
I never heard this sound before...
Piston or "kips sound" ??

Thank you!!!
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JoKDX220r
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Post by JoKDX220r »

Ok, so this morning I get the bike out, warm it up and made this short video

At 0:09 you can hear the knocking sound I'm worried about...
I didn't hear it when engine was cold... :?

http://vimeo.com/14336546
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Griffbones
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Post by Griffbones »

Hard to tell by the video. The best thing you can do is pull the top end and see what you can find before it is too late.
'83 CR60R Fully restored
'97 DR350 (407cc)
2005 KX85 (103.5cc)
2006 KDX 200 (Bone stock other than Jetting, Gnarley woods, Turbine Core II)
2007 250 XC-W (SX head)
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JoKDX220r
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Post by JoKDX220r »

Piston have a lot of carbon on top, kips valves also have a lot of carbon, I cleaned them on 2008-2009 winter, the type of deposite on valves are weird I'll take a picture of it...

Should I try the right side of the engine ? I removed the clutch cover to see the autoclutch, everything was ok...
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JoKDX220r
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Post by JoKDX220r »

Ok, I found it !!

thanks Griffbones for you're reply.

Here is what I believe is the problem.
http://vimeo.com/14393098
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Griffbones
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Post by Griffbones »

Yep that bearing is shot!
'83 CR60R Fully restored
'97 DR350 (407cc)
2005 KX85 (103.5cc)
2006 KDX 200 (Bone stock other than Jetting, Gnarley woods, Turbine Core II)
2007 250 XC-W (SX head)
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