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rebuilding yz125 piston damage

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Rebuilding a 2006 and this piston is in horrible shape as well as the cylinder any explanation on how this happened?

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Detonation, lean, Namura piston. 

Langcourt.com they are worldwide as I no not your location.

Just have them supply a Vertex or Wiseco piston with replace to stock bore.

Strip the head of all PV and studs. 

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20 hours ago, P84ONE said:

Detonation, lean, Namura piston. 

Langcourt.com they are worldwide as I no not your location.

Just have them supply a Vertex or Wiseco piston with replace to stock bore.

Strip the head of all PV and studs. 

How can I richen it up? As I do not really know how to adjust the carb.

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59 minutes ago, Ian Arnold said:

How can I richen it up? As I do not really know how to adjust the carb.

Top of the page is a look before you post "sticky". inside there is muliple threads on jetting, personal bike set up, pipes, suspension, etc. etc. etc.

You will find everything you need in there and on here for any specific questions you may have.

Carb is adjustments and jets "brass" swaps to find what works best in your area, has to do with your altitude, fuel mix, etc. etc. etc. 

And never put a Namura in your bike. Go what you can afford: OEM, Vertex, Wiseco, Wossner-although others will say different. 

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