KTM 640 Horrible engine noise!!!!

moto_psycho · 02-09-2013, 04:24 AM

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?

tallbob · 02-09-2013, 05:08 AM

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.

Tallbob
99 LC4E

moto_psycho · 02-09-2013, 05:25 AM

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?

Kawidad · 02-09-2013, 05:55 AM

Is this a new noise or has it been loud?

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

tallbob · 02-09-2013, 06:01 AM

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.

It'sNotTheBike · 02-09-2013, 06:31 AM

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.

It'sNotTheBike · 02-09-2013, 06:32 AM

[QUOTE=Kawidad;20684908
The LC4 engines make a lot of weird noises without being defective.
[/QUOTE]

NOT noises like this they don't !

gunnerbuck · 02-09-2013, 06:39 AM

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...

moto_psycho · 02-09-2013, 07:13 AM

That fills me with confidence! 1st viewing over, 1 to go, then I'll get that left cover off!

RideFreak · 02-09-2013, 07:45 AM

Sounds too frequent to be the big end, I think it's in the topend.

moto_psycho · 02-09-2013, 08:41 AM

Counter balance shaft is slapping around like a turd in a bucket. I'm gonna try removing it

moto_psycho · 02-09-2013, 09:57 AM

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...

gunnerbuck · 02-09-2013, 11:11 AM

Quote:

Originally Posted by moto_psycho

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...

ericGSsti · 02-09-2013, 11:56 AM

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.

moto_psycho · 02-09-2013, 03:54 PM

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!

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

02-09-2013, 04:24 AM	#1
moto_psycho ^OP Nob. Joined: Nov 2008 Location: ipswich, england Oddometer: 122	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? __________________ AR50,TS125X,DTR125,MTX125,KDX200,KL250,DR400S,DRZ4 00S,XJ400N,XR400R,CBR600F,DR650,XS650,GSX750F all helped me whittle myself down to a KTM640E perfect bike!

02-09-2013, 05:08 AM	#2
tallbob Studly Adventurer Joined: May 2005 Location: Butt Mt. VA Oddometer: 511	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. Tallbob 99 LC4E __________________ Twin Valley Riders

02-09-2013, 05:25 AM	#3
moto_psycho ^OP Nob. Joined: Nov 2008 Location: ipswich, england Oddometer: 122	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? __________________ AR50,TS125X,DTR125,MTX125,KDX200,KL250,DR400S,DRZ4 00S,XJ400N,XR400R,CBR600F,DR650,XS650,GSX750F all helped me whittle myself down to a KTM640E perfect bike!

02-09-2013, 05:55 AM	#4
Kawidad Beastly Adventurer Joined: Jul 2005 Location: Central Coast, Cal Oddometer: 3,812	Is this a new noise or has it been loud? The LC4 engines make a lot of weird noises without being defective. __________________ "Deeply flawed people make deeply flawed decisions."

02-09-2013, 06:01 AM	#5
tallbob Studly Adventurer Joined: May 2005 Location: Butt Mt. VA Oddometer: 511	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. __________________ Twin Valley Riders

02-09-2013, 06:31 AM	#6
It'sNotTheBike Banned Joined: Jul 2011 Oddometer: 704	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.

02-09-2013, 06:32 AM	#7
It'sNotTheBike Banned Joined: Jul 2011 Oddometer: 704	[QUOTE=Kawidad;20684908 The LC4 engines make a lot of weird noises without being defective. [/QUOTE] NOT noises like this they don't !

02-09-2013, 06:39 AM	#8
gunnerbuck I.Hopp. Joined: Nov 2005 Location: N.V.I, B.C. Oddometer: 3,078	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... __________________ 640 A x 2

02-09-2013, 07:13 AM	#9
moto_psycho ^OP Nob. Joined: Nov 2008 Location: ipswich, england Oddometer: 122	That fills me with confidence! 1st viewing over, 1 to go, then I'll get that left cover off! __________________ AR50,TS125X,DTR125,MTX125,KDX200,KL250,DR400S,DRZ4 00S,XJ400N,XR400R,CBR600F,DR650,XS650,GSX750F all helped me whittle myself down to a KTM640E perfect bike!

02-09-2013, 07:45 AM	#10
RideFreak Torque Junkie Joined: Apr 2009 Location: County Lockup Oddometer: 3,544	Sounds too frequent to be the big end, I think it's in the topend. __________________ *Chris* VIDEOS

02-09-2013, 08:41 AM	#11
moto_psycho ^OP Nob. Joined: Nov 2008 Location: ipswich, england Oddometer: 122	Counter balance shaft is slapping around like a turd in a bucket. I'm gonna try removing it __________________ AR50,TS125X,DTR125,MTX125,KDX200,KL250,DR400S,DRZ4 00S,XJ400N,XR400R,CBR600F,DR650,XS650,GSX750F all helped me whittle myself down to a KTM640E perfect bike!

02-09-2013, 09:57 AM	#12
moto_psycho ^OP Nob. Joined: Nov 2008 Location: ipswich, england Oddometer: 122	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... __________________ AR50,TS125X,DTR125,MTX125,KDX200,KL250,DR400S,DRZ4 00S,XJ400N,XR400R,CBR600F,DR650,XS650,GSX750F all helped me whittle myself down to a KTM640E perfect bike!

02-09-2013, 11:56 AM	#14
ericGSsti Gnarly Adventurer Joined: Oct 2009 Location: Dublin, Ireland Oddometer: 253	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. __________________ 2008 KTM 640 adventure. Africa Twin XRV750 RD04 IBA membership no.35934 "In the spirit of adventure, open to all riders and carrying a message of friendship between all men"- Thierry Sabine 1977 founder of the Paris Dakar -

02-09-2013, 03:54 PM	#15
moto_psycho ^OP Nob. Joined: Nov 2008 Location: ipswich, england Oddometer: 122	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! __________________ AR50,TS125X,DTR125,MTX125,KDX200,KL250,DR400S,DRZ4 00S,XJ400N,XR400R,CBR600F,DR650,XS650,GSX750F all helped me whittle myself down to a KTM640E perfect bike!

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