x2 what MBHD and 70nova said but I'd add:
1. Some of those later carbs like the MV like the choke ALL the way shut when you go to start em, IIRC the MV likes this especially if jetted lean. Pop the hood and check it, after U pump the pedal but before cranking.
2. Easier than pulling the top off the carb is
2a. Make sure its getting pump shot, give it a couple squirts (key off of course).
2b. Pull the fuel line off, use a squeeze bottle to "fill" the carb. It will always take some in the morning, but if it takes a whole bottle it means the carb was empty. It should just take a little bit, an ounce or two maybe. If more, its either leaking or boiling off so theres no gas in the bowl after that.
