So I'm working on a taotao type (no name or metal stickers) gy6 139qmb 50cc 4stroke and it was running fine then stopped running at all. After checking for the basics (spark, compression, fuel flow) I didn't have spark. So I got and installed new cdi, new ignition coil, new stator, new rectifier, new battery, new spark plug, new carburetor, and new fuel lines and new fuse. So after having replaced basically te entire ignition system I still don't have spark despite doing a valve job to .003 on intake and.005 on exhaust. I'm rattled af and can't seem to figure this out please help! What else could it be?