Is your fuel pump working? are you getting fuel to the carb?
1. check for spark
2. check for compression in all cylinders
3. check carb (if it's been a long time since it was last started, you will need to just take the carb apart and clean it or get a carb rebuild kit. rebuild kit is easiest route and once you do that, you are done fussing with it.
4. Diagnose the problem.
a. try starting fluid directly into the carb. If it fires up then quits you have a fuel delivery problem. Once you figure out that, you can trace the problem back from the motor to the tank.
5. If you don't have any spark, try new plugs, then try new wires, then start going over your electrical system
Btw, I’m available to help over the phone in case u need at
https://www.6ya.com/expert/matthew_d24b835e574ef6ca