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Join Date: Mar 2006
Location: sweden
Posts: 39
mechanic noies after topend rebuild sc 3.0

Hi

I got strange mechanic noies that I cant find the destination for.
I made a topend rebuild after a misshifting and bend all exhaust valve's and three broken rocker arm's.
The problem is that after couple times i got a mechanic nasty noies after a warmup.
I shut down the engine and restarted the engine and noies was gone.
Yesterday i got this noies again after warmup and it disappear after engine restart.
No engine performance degred as could fiel. I have not drive so many miles.
I have open the valve cover and didn't notice any problems.

Any suggestion on what could case this nasty noies?
It sounds like that the chain is touch the block some how after awhile and after engine restart it goes back into normal positions.

Regards
Tom

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/tom

911 sc -83
944 -86
KTM 125cc
Old 10-08-2012, 06:33 AM
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Join Date: Sep 2012
Location: Vilnius
Posts: 3,088
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Valve adjustment?
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“Of the value traps, the most widespread and pernicious is value rigidity. This is an inability to revalue what one sees because of commitment to previous values. In motorcycle maintenance, you MUST rediscover what you do as you go. Rigid values makes this impossible.”
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Old 10-08-2012, 06:47 AM
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There was an account on here quite recently about a failed tensioner and resulting chain slap...

Go here, listen to the clip in post #63.
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Old 10-08-2012, 06:48 AM
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Thanks for your suggestions.
But is not valve adjustment and dosent sound like the rattling sound in the chain slap.
The sound is more like continues noies, and it disappears after restart engine.
It's not so high sound and cant locate the source.

Regards
tom
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/tom

911 sc -83
944 -86
KTM 125cc
Old 10-08-2012, 07:50 AM
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Post up a sound file or chase it with a mechanic's stethoscope.
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'90C4
Old 10-08-2012, 11:32 AM
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Does it make the sound with the clutch pedal pushed to the floor?

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Old 10-08-2012, 03:53 PM
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