ya it is friday payday not working on anything tonite except a few barleypops!
1. pull the plug and put a little gas in the plug hole to help prime the engine. Replace the plug and see if you start the engine. If no start, good possibility it is a Magneto or CDI problem.
2. change the plug out, the China Girl Plugs are not that good. Replace with a NGH BP6HS plug with about a .25 gap
3. do the spark plug test as some one mentioned here, plug on top of motor, move bike forward, see if you see any spark from the plug.
4. a real good consideration is to put a neoapreme "O Ring" between the the carb tube and the intake tube, to insure ther is no air leak so the cylinder. "O Ring" dimentions are 5/8 ID X 3/4 OD X 1/16 wall. The cylinder will not suck gas from the the carb, if there is an air leak. When you reattach the carb to the intake tube, press carb tube on firmly to get a good seal, and tighten the carb clamp
5. You may not be getting any engery from the Magneto, or the CDI. I had that problem resulted in no spark on the spark plug.
6. MOST IMPORTANT do not give give up. Take your time, stop and think it thru. You need fuel, compression, and spark to start the engine. My engine did not start at first. I tried all the comments and suggestions on this site. I had to replace the Magneto, and then the engine started with in 100 feet. It sure is fun when she runs, be sure you do not over speed the engine during the 1 st tank of fuel, break in the engine slowly.
GOOD LUCK WITH IT, HANG IN THERE, NEVER, NEVER QUIT. (Quote by Winston Churchill at a College Graduation Commencement Address)
Dave
Lakeland, Florida