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Old 03-03-10, 03:37 PM   #1
Richie Gelder
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Cool knock noise?

Hi just started my 2001 curvy for the first time since buying it as a none runner and their seems to be a knocking noise coming from by the back cyclinder just above the clutch area seems to go when i take the revs up a bit is this a normal noise? any help cheers gents Richie.
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Old 04-03-10, 02:02 PM   #2
Alpinestarhero
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Default Re: knock noise?

a knocking noise is not normal. It could be something simple like incorrect air/fuel mixture or bad fuel causing pre-detonation ("knocking"). Or it could be some bearing faliure or something on the crank. Is there enough oil in the engine? Is the oil fresh?

Matt
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Old 04-03-10, 02:20 PM   #3
keith_d
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Default Re: knock noise?

Check that Josef Fritzl wasn't the previous owner... otherwise there might be a secret compartment back there.

But seriously, knocking noises aren't a good thing.

A regular knocking that varies with oil pressure could be the big end bearings.

Pinking (knocking) due to timing or fuelling issues is most noticable at low revs and high throttle openings because that's when the cylinder pressure is highest

Loose engine mounts and dangling exhaust systems can show up at a variety of RPMs

So, definitely worth tracking it down.

Keith.
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Old 04-03-10, 08:17 PM   #4
Red Herring
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Default Re: knock noise?

Quote:
Originally Posted by Richie Gelder View Post
Hi just started my 2001 curvy for the first time since buying it as a none runner ......
Could the knocking perhaps be the reason it was sold as a non-runner?
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Old 04-03-10, 08:25 PM   #5
Alpinestarhero
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Default Re: knock noise?

Quote:
Originally Posted by keith_d View Post
Check that Josef Fritzl wasn't the previous owner... otherwise there might be a secret compartment back there.
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Old 04-03-10, 09:42 PM   #6
rotax81
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Default Re: knock noise?

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Originally Posted by Red Herring View Post
Could the knocking perhaps be the reason it was sold as a non-runner?
sounds about right.
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