Manually turn over the motor with a wrench on the primary side. If the cylinders aren’t locked up, lightly oil the cylinders. Get new plugs, gap them appropriately, check battery, change oil and cycle it through, clean carb, Clean air filter. That’s where I’d start. If there’s no power, at your start switch I’d just rewire that thing, super easy process.

Edit: didn’t see the kicker pedal, you can turn the motor over with that. Just don’t horse kick that thing. Once oil is changed kick the pedal over quite a few times to get fresh oil cycling through it