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Old 07-29-2014, 07:13 PM   #1
LXnastynotch93 OP
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KTM LC4 Engine Noise...

So my LC4 decided to start making this lovely symphony of sound:

https://www.youtube.com/watch?v=Ok644ZH1cJ0

I'm thinking that something is wrong here. Any suggestions?
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Old 07-29-2014, 10:00 PM   #2
Alik
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Does the strange sound come from the right side of the engine?
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Old Yesterday, 05:11 AM   #3
LXnastynotch93 OP
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Originally Posted by Alik View Post
Does the strange sound come from the right side of the engine?
Not sure but it sounds like its louder from the shifter side of the motor.
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Old Yesterday, 08:50 PM   #4
bmwktmbill
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Check the valve clearances, if it's excessive remove the engine top cover to check the cam followers out.

If that doesn't show anything drop the oil and check the oil plug magnet for debris.

If that's all good ride it some more.

b
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Old Today, 04:11 AM   #5
T3/T4 Hybrid
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Mine had a noise very similar to that. I replaced the spring under the decompression mechanism on the camshaft, cam rocker rollers and adjusted the valve clearance properly. The noise is now gone.

I found the decompression spring had gone weak and the intake side cam roller was starting to seize. My bike has 17,000 miles on it.
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Old Today, 05:42 AM   #6
LXnastynotch93 OP
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Quote:
Originally Posted by T3/T4 Hybrid View Post
Mine had a noise very similar to that. I replaced the spring under the decompression mechanism on the camshaft, cam rocker rollers and adjusted the valve clearance properly. The noise is now gone.

I found the decompression spring had gone weak and the intake side cam roller was starting to seize. My bike has 17,000 miles on it.
Interesting. Is the decompression lever supposed to spring back into place? Mine just stays put and I have to manually move it back to the closed position.
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Old Today, 05:59 AM   #7
Kawidad
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Quote:
Originally Posted by LXnastynotch93 View Post
Interesting. Is the decompression lever supposed to spring back into place? Mine just stays put and I have to manually move it back to the closed position.

Houston, we have a problem.......
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Old Today, 06:48 AM   #8
LXnastynotch93 OP
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I figured that was not a good sign. I'm thinking about removing the motor and possibly rebuilding the head while it's out.

Also I have a kind of specific question. The previous owner said he didn't use a torque wrench to tighten down the jug but that he did it by feel (500 miles).

Would it be okay once I had the cylinder head off to back those base nuts off and re-torque them down, or would that disrupt the seal at the base of the cylinder?
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