ISX 450 CM570 taking too long to start and using too much oil

[christiank77]

(01-19-2021 )tree98 Wrote:  I can't tell if that's just a lot of carbon buildup or if it's melted? What made you decide to remove the head to diagnose a hard start condition? Seems like there's gotta be more to the story.

That is not carbon buildup but actual "melting" of the piston or some form of erosion.We decided to open the engine as last part of the process to find the cause of excessive oil consumption after checking other possibilities.