Since I am a little bigger now, I decided to convert one of my KX85 dirtbikes into a Super-Mini. Basically, I would need a bore kit, aftermarket pipe, larger rims, tires, tubes, and a longer swingarm. The hardest part of the whole conversion is increasing the size of your engine. If you are working on a KX85, you can get parts from a KX100. The KX85/100s have not changed much, if any, since 2001. One way to convert the engine is to order the complete top end from a KX100. If you do this, you will need everything. The piston, cylinder, power valves, and cylinder head will all have to come from a KX100. If you get lucky, you might get a whole top end for cheap on e-bay. There is a problem though, the stock Kawasaki chrome in the bore is not very good and the porting is aimed at beginner level riders on the KX100 cylinder, so it won’t rev out like most racers want.