Lets start one at a time.
Pick the one you want to get fixed first. List your modifications, things youve done to try and troubleshoot it, symptoms etc.
Then we will do what we can. 2 strokes are pretty simple. You need fuel, spark, and compression (and to an extent timing) to run properly. Its pretty simple to test for all 3, so you should do a preliminary test for fuel (pull the line off the carb and if it flows freely with the petcock set to on its got flow there). The next test would be to connect fuel back to the carb, turn fuel to on, and let the bowl fill up. Then remove the carb or twist it so you can get the bowl drain plug off and if you get fuel draining out of it, the carb is most likely holding fuel. Guys on here will also tell you to remove the carb, clean everything out, make sure the slide moves freely, the needle goes into the jet hole properly, everything looks ok there.
Compression is easy to test. Just get a compression gauge and perform a compression test.
Test fuel and compression and come back and report and we will show you how to test spark. Electrical troubleshooting is a bit more tricky.