Check for power at ign switch which being it turns over you have power but check anyway to be certain what color wire is hot. Then turn the key to on and check for power to ign. I can only tell you is most overlook the ign. switch because the engine turns over but the switch could be bad for not supplying 12v. to the cdi even though it supplies power to the starter solenoid. If no power to ign. at switch then switch is bad, if 12v. is present at the switch follow the wire to the cdi and make sure the cdi has 12v. power if not you have a break in wire from ign. switch to CDI. You mentioned you replaced the CDI, stator and pickup and I assume by RR you are referring to the regulator/rectifier so for now we will assume these are OK. The last thing to check will be the spark plug. If it looks good don't mean it's good. Years ago from tip to electrode there was a solid copper rod about 1/8" diameter however today they only use a fine wire and if a Chinese brand not a major brand the copper will be recycled and much more brittle. If the copper burns through it will not provide spark. So bottom line when checking for spark check wire to ground directly and if using plug to check make sure you have a working plug you definitely know is good. Hope something here helps, keep us posted.
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