Piston Crown Discoloration

Discussion in 'Tech Questions' started by jake_1213, Jan 18, 2016.

  1. jake_1213

    jake_1213 Member

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    When I took my motor apart this year I've noticed the underside of some of the piston crowns are turning a slight tint of brown. Looks like she might be getting a little warm. I don't know weather to blame the Sunoco fuel but I never had anything like this before with C25. I'm using the same timing and jetting that I was before with C25. I'm not sure weather to put more fuel in it or back down the timing a little. Any advise or tips tuning with the SR18 in the area of jetting and timing would be appreciated... Maybe this is normal
    Thanks Jake
     

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