I need help! I have a chinese made 150cc that i bought recently for my son. While riding it, it just quit running! I have changed the spark plug,coil, and cdi box with none of this solving the problem. It turns over fine but seems like not getting any fire. I have taken the plug out and looks like not throwin any spark. My boy gettin impatient! Any suggestions?  

if you have replaced the cdi box and the coil then the only thing left is the stator.

check all of your connections and check the fuse as well.
but barring that i'd be looking at the stator.  

Would the stator cause no spark though? I thought the stator had to do with the charging system?  

You may well have sorted out your problem by now, but the same thing happened to my scooter (same engine) and the problem was caused by the flywheel shorting out two wires that come from the magneto. Identifying the problem took a couple of days, the fix took about 30 seconds and a few inches of insulation tape.  

yes the stator also tells the coil when to spark by lifting the ground as the magneto's contact point passes the stators' contact.  

Ok! Does anyone know where I can get a flywheel puller for this motor?  

i used one i picked up at a autoparts. it has 3 arms