you should have fixed the pull start first of all really,the nut will be on the end of the crankshaft and there are a couple of ways to get it off i would use a special tool made by snap on that removes rounded off nuts but your not going to have a set of these so you can either split the nut by drilling into it avoiding drilling into the crankshaft and then split it with a sharp chisel or you could try knocking a slightly smaller socket onto it but be careful not to bend the end of thr crankshaft or you will get alot of vibration when it goes again.the starter motor will more then likeley be at the front of the engine underneath on this engine its basically a strimmer engine if you want a pull start assembly tell me and ill put one on ebay for you i have a spare one in my garage.
adam bike doctor, January 2010