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  #1  
Old 06-27-2016, 09:20 AM
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Default KTM 125 sx 2009 loud rattle (video)

     

Bikes always had a little ticking noise hardly Noticeable when your let off the throttle when riding but just started this when riding Saturday. It's just had a new top end 5 hours ago twin ring vertex piston. Iv attached a link to video to hear or see what people think!

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Old 06-27-2016, 09:26 AM
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Could be a rod bearing.

Paw Paw
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Old 06-27-2016, 09:30 AM
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Big end? Did the little end when the piston was done! Is it a hard job?
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Old 06-27-2016, 10:31 AM
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You would need to be sure that is the problem before tackling it. You can check it by pulling the cylinder and checking to see if it has up and down movement. If so, it will need to be replaced. If not, then pull the stator cover and check the crank end bearings by doing the same movement. If it moves then it's the crank end bearings that need to be replaced.
There is one other possibility.....Does the rattle go away when you pull the clutch in with the engine running? If so, then it's the clutch basket bearing.
The answer to the question about how hard it is to fix....Yes it difficult as you will need special tools to do the job.

Paw Paw
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Old 06-27-2016, 10:46 AM
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Guessing the rod has to be taken out for that right ? And noo it still does it with the clutch in! Sent the video my friend who rebuild bikes for a living and he just said bottom end lol that helps lots! Thanks for your response paw paw much appreciated! I'll get the barrel off soon as I get chance n check it out! If the rod has movement is it just the bearing that needs replacing not the actual rod ?

---------- Post added at 05:46 PM ---------- Previous post was at 05:42 PM ----------

One more thing would the big end bearing cause a rattly noise like that my dads saying it would be more of a knocking than a rattle or does he not know what he's talking about lol he only knows car engines not motorbikes he hates them! This was his advice get rid of the thing and get a nice car lol
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Old 06-27-2016, 01:33 PM
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If the rod bearing has gone bad then in most cases the rod will have become out of round as well. The crank has to come out and either replace the complete crank assembly or if you can find a rod and a good shop to install it then it can be replaced.

Paw Paw
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Old 06-27-2016, 01:45 PM
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Okay thanks buddy I'll get barrel off tomorrow and check the rod for play! I have a local shop that do that at a good price! Do you know if ktm125 2009 have a power valve? Sounds stupid but there's something on the front of cylinder near the exhaust port that wasn't on my old bike lol
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Old 06-27-2016, 03:44 PM
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Yes....You sure need a service manual.

Paw Paw
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Old 06-27-2016, 07:06 PM
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I know I do lol I'll get one ordered I'm gunna take the cylinder off tomorrow and check out the rod! Been doing a little internet searching quite a few people are saying power valves are quite common for being loud and rattly any signs that would say it could be that ?
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Old 06-28-2016, 09:25 AM
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before you proceed with removing the cylinder check as PawPaw said the crank bearing from the stator side for any play, is much easier than removing the cylinder.
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