im just wondering what the advantages are or whether i need to run my bike on 50/50.i know alot of 2stroke proddie lads do mix it,but as its going to be my first go at production 250 im not sure.the bike is tuned but is running on unleaded at the moment.also ive found in the spares a hrc jet kit and needles,are these worth fitting or are they just a bit of a gimick. thanks.