| hey mate!
1. try taking apart your carbie and then re-assembling it, but make sure this time round, there will be no air leaks!
2. a loose spark plug will make you loose all your compession, so make sure shes tight, but not too tight.
3. as for the head, well i hope you sealed that good and proper?!
4. the ignition, make sure its not touching the flywheel, about a ATM cards distance off it is good stuff! do you have a good ground?
to check if you got spark, take out the spark plug, still conected to the lead.. put it up against the head and give your bike a pull! you want a nice blue-purple spark!
also could just be your fuel? you can kinda see this by the amount of smoke, or on the spark plug its self.. soz but ive forgoten what colour means what haha!
well i hope you get it going! if not, ask again! | 
