How much oil are you mixing with 1 gallon of gas?
It is a little confusing, One place in the manual it recommends 4% (5.12 ozs) another place 3% (4 ozs) and the gas cap has 2% stamped on it (2.5 ozs).
So you should not be using no more than 5 ozs of 2 stroke oil per gallon, for the first 300 miles .
The Kinetic gas tank does not hold a gallon of gas. It only holds .66 of a gallon so if you are not mixing in a separate gallon container and mixing the oil in the tank you may be adding too much oil which would cause your spark plug to foul.
If you mix in the tank you should only put in about 3.5 ozs of 2 stroke oil to a tankful of gas during the first 300 miles.
After the first 300 miles if you mix in the gas tank you should add about 2 ozs (1.7 ozs) of 2 stroke for a 2% mix or 2.5 ozs for a 3% mix