Detonation in my SXZ

Wow!!! :eek: Takahiro san.

The last time I was anything like this was a racing two-stroke that holed a piston. I've read that the detonation shock wave had the same force as a hammer blow. But never seen the proof until viewing your pictures. So it was running lean on that cylinder?
Hi Darryl san.

I don't know for sure, but it might be running lean on that #2 cylinder. The mechanic told me that the #2 cab body was worn. Until this engine failure I used D8EA, but I may need to change to D9EA like E27.
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