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Yellow film/buildup in intake ports

Discussion in 'Tech' started by moto316, Nov 18, 2023.

  1. moto316

    moto316 Well-Known Member

    Checking the bike over during the offseason and noticed something I haven't seen before. It was a brand new 2020 zx10r built up by KWS for Stock1000 and was crashed and then sold to me after the first round in Atlanta, so it had a few hundred miles with the VP MGP fuel in it. During my ownership its predominantly been run on 93 non-ethanol pump gas, apart from less than a handful of times when I had no choice but to put regular 93 ethanol. Bike has around 4000 miles now since I started racing it beginning of 2022.

    There's a buildup of some kind of yellow film right above the valve seats in the intake ports, tried scraping it with a pick but doesn't seem to come off. Almost looks and feels like the surface is pitted. Any ideas?

  2. regularguy

    regularguy Always Krispy

    That's from the MGP. All of our bikes have that in the throttle bodies and the intake ports. It should clean off with brake cleaner/carb cleaner.
  3. moto316

    moto316 Well-Known Member

    yep, as did mine, thanks
  4. RM Racing

    RM Racing Tool user

    They put dye in race fuels, it doesn't burn as well.

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