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View Results: What is the horrible noise?
Cam chain tensioner 2 5.13%
Camshaft rockers / bearings 10 25.64%
Big end 10 25.64%
Gearbox main shaft bearing 3 7.69%
Crankshaft bearings 8 20.51%
Other? 6 15.38%
Voters: 39. You may not vote on this poll

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Old 02-09-2013, 04:24 AM   #1
moto_psycho OP
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Eh? KTM 640 Horrible engine noise!!!!

http://www.youtube.com/watch?v=Avb-G...ature=youtu.be



Apologies about the camera, it's just a bit rubbish, but the sound is there.

Any ideas? Cam tensioner? Cam rockers? Big end? Gearbox main? Crankshaft bearings?
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Old 02-09-2013, 05:08 AM   #2
tallbob
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Sounds louder on the left side. I'd pull the left side case cover and take a look. Just lay the bike down on a couple of tires or something and you won't have to drain the oil. Pull the clutch cover and the clutch so you can see the main shaft bearing and take a good look at the balancer and bearings.

Make sure it's not something outside the engine vibrating. Exhaust, skid plate, kick starter etc. can vibrate and make a racket. Good luck hope it's not serious.

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Old 02-09-2013, 05:25 AM   #3
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I just pulled the right side and there is no play in the rotor.

There seems to be an accumulation of noises... perhaps I have every common lc4 fault there is. We have people coming round to view the house in a couple hours so I can't really do anything till 2moro :(.

There does seem to be a bit of a noise at the very front of the left side of the engine. Is that the balance shaft?
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Old 02-09-2013, 05:55 AM   #4
Kawidad
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Is this a new noise or has it been loud?

The LC4 engines make a lot of weird noises without being defective.

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Old 02-09-2013, 06:01 AM   #5
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If I remember right that's where the balancer is. It's been a long time since I've had mine opened up. Your bike probably has the upgraded main shaft bearing but it would be worth a look. If you haven't already, check your oil for metal debris which could mean a bearing problem.
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Old 02-09-2013, 06:31 AM   #6
It'sNotTheBike
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It is a bearing failing, possibly the crank main.

Quit running the bike, period. It is not going to
fix itself by running, but it may indeed destroy itself.

Tear the engine down, inspect and repair.
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Old 02-09-2013, 06:32 AM   #7
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[QUOTE=Kawidad;20684908
The LC4 engines make a lot of weird noises without being defective.
[/QUOTE]


NOT noises like this they don't !
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Old 02-09-2013, 06:39 AM   #8
gunnerbuck
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It is not the mainshaft bearing that is making that sound...

It is likely one of the bearings on the crankshaft, it actually sounds like the left side crank end bearing is having mini seizures... I would suspect you may also have some piston damage... I would not run the engine any more and start an investigative tear down... With any luck it will be just a seized up balancer, but to me it sounds much worse...
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Old 02-09-2013, 07:13 AM   #9
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That fills me with confidence! 1st viewing over, 1 to go, then I'll get that left cover off!
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Old 02-09-2013, 07:45 AM   #10
RideFreak
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Sounds too frequent to be the big end, I think it's in the topend.
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Old 02-09-2013, 08:41 AM   #11
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Counter balance shaft is slapping around like a turd in a bucket. I'm gonna try removing it
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Old 02-09-2013, 09:57 AM   #12
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Ok, I'm guessing you can't get the counterbalance off without removing the clutch basket and crank pulley?

Crank is solid and turns nicely, same with clutch...
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Old 02-09-2013, 11:11 AM   #13
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Quote:
Originally Posted by moto_psycho View Post
Counter balance shaft is slapping around like a turd in a bucket. I'm gonna try removing it
The counter balancer normally feels like it is overly sloppy when the clutch sidecover is off, it takes the second bearing in the cover to hold it steady...

Yes, you must remove the clutch and gears to get the balancer off... Once removed, you'll be able to see if the balancer is all scraped up from rubbing the cases as well as the cases being scraped up themselves to indicate shot bearings...
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Old 02-09-2013, 11:56 AM   #14
ericGSsti
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My 640 adv started sounding like this today after a run in the mountains. Sounds like a bag of spaners. Dropped it up to my machanic just before closing and he did a quick stethoscope check to try and pin point and it sounds like the clutch area to. So very interested in what you discover. Could be the same thing.
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Old 02-09-2013, 03:54 PM   #15
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Eek

PayPal have locked my account until 5 clears, so hopefully mid week I will have a strap wrench to take the clutch basket off, afterwards I will take the counter shaft out and start her up again, I'll make the same video again we'll see what wee get!
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