Hi I'm new to this site but need some help

FITTED 70 KIT ON NRG AND WAS RUNNING FOR HALF AN HOUR AND NOW WON'T START. THE KICK START IS PUSHING BACK AT ME AND YOU CAN HERE THE EXHAUST BACK FIRING. ANY IDEAS TO Y AND IT'S GETTING FUEL BUT CAN'T SEE A SPARK

 

remove the spark plug keep ignition turn off and pop a rag down where the spark plug fits, now kickstart the bike to get rid of the excess fuel . if its locking the kickstart its possible its flooded and hydro locking .

OIL ? are you still using the standard autolube feed ? usually with a 70 kit we would blank off the oil feed and run a direct to tank-fuel oil mixing . your 70 kit needs extra oil as its a larger bore and higher capacity now. 33:1 is a good start ( 1 gallon fuel and add 156-160ml of oil to it and give it a mix )

 

I do mix oil with fuel mate on mine it's the only way, do you think the piston could be nakered already. My mate said it sounds like it's not sparking enough so going to try a new plug tomorrow and try what you said