2 Stroke Tune Up Kit. Fits: (1993-2002 YZ80) (2002-2025 YZ85). Includes: 2 (16oz) Bottles Of Castor 927 2 Stroke Oil (1 Quart Total), 1 Quick Mix Ratio Bottle, 1 OEM Spark Plug BR10EG, 1 Pre-Oiled ProFilter Air Filter, 1 Pair Of Disposable Gloves. Quick Mix Bottle Includes Ratios From 24:1 to 100:1. Simply choose the ratio of oil you wish to use and the amount of gas you are going to mix. Fill oil to the mark corresponding to the amount of gas you will use. For example: To mix 4 gallons of gas at 32:1, fill oil to the 4.0 gallon mark under 32:1 ratio. To mix 6 gallons of gas at 50:1, fill oil to 6.0 gallon mark under 50:1 ratio. etc... If you are using liters of gas, follow the same procedure. Bottle also features ounce and CC calibrations--located on the right side. Use these for you own custom ratios, filling transmission oil, fork oil, etc.