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ktm 125 sx 2002 engine noise (video)

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Back story:
Bike purchased 1 year ago, noise was present so got it for a decent price. Top end was done as I suspected that is where the noise was coming from, rod checked and everything was good.

New top end, same noise! It's been a year since and approx 30 hours riding time and the noise hasn't got any worse but now it's come to selling it I need to fix it but not sure where to start, I suspect it is possibly the powervalve creating the noise.

Video: https://www.youtube.com/watch?v=7O5ZuHlfxU0

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that is the noise of the piston moving up and down at idle.

 

New to 2 smokers?  They sound funny to the untrained ear, especially at idle with the burping and pinging going on.

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7 hours ago, billtro11 said:

that is the noise of the piston moving up and down at idle.

 

New to 2 smokers?  They sound funny to the untrained ear, especially at idle with the burping and pinging going on.

 

It 100% is not correct, the noise is there when revving too and multiple people have viewed the bike and commented on the noise and it is very clear in person maybe the video doesn't show it properly. I am not new to 2 strokes.

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