Lean condition?

[Ieat4strokes]

Buddy of mine I recently met had his right cylinder go down. He tore it down and told me there was a hole in his piston on that side. I told him it was due to a lean condition on that side. Sound about right? Something wring with his right carb or what? He said he checked boots and no cracks or airleaks that he knows of.

[Ieat4strokes]

So noooooooobody knows what will cause a hole in one piston?

[bbcmudtruck]

Yes, a lean condition could cause a hole in the piston. What does the plug look like?