1.OK- its a 2 stroke engine, so warming up is vitally important with this type of engine (good 5 mins)- if you are doing this already- good! 2.check the spark plug- look for fouling- this will give an indication of the mix, if it has been set too rich or too lean http://www.4secondsflat.com/Spark_plug_reading.html shows a few examples 3.ensure you have clean/new fuel- drain & replace 4.same with oil- ensure feed is correct 5.Air filter- remove, inspect, clean with 50/50 petrol & 2 stroke oil ( petrol evaporates leaving a thin film of oil to catch extar rubbish...only do his if the air filter is SPONGE- if paper then examine & replace if neccessary. 5.The carb "may" be dirty/not set up, although, I would not attempt this unless you feel confident If you got it from a dealer- take it back and ask them to help- they will be more than keen to help- but not always on a Saturday. Let us know how you get on