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u/Upset_Position_9256

Image 1 — YZ250 30 Hour Piston Failure
Image 2 — YZ250 30 Hour Piston Failure
Image 3 — YZ250 30 Hour Piston Failure
Image 4 — YZ250 30 Hour Piston Failure
Image 5 — YZ250 30 Hour Piston Failure
Image 6 — YZ250 30 Hour Piston Failure
Image 7 — YZ250 30 Hour Piston Failure
▲ 16 r/2Strokes+1 crossposts

YZ250 30 Hour Piston Failure

Any ideas why this 30-hour piston failed?

91 octane CA pump gas mixed 40:1 with Yamalube 2R

My jetting is:

  • 175 Main
  • N3EW Pos 2
  • Pilot 50
u/Upset_Position_9256 — 5 days ago