without a base gasket, i doubt it will fire at all. but you will still need to get a compression reading. it needs to be 120 lbs or higher. put that gasket on and then try this.
spray carb cleaner in the carb throat and then try to start the engine. if it fires, you havea fuel problem. if it does nothing, you have either an electrical,or compression problem. so pull the plug and test for spark. try a new plug too. if you have good spark then you need to check compression readings.