Try letting it idle with choke ON for about 4-5 minutes.
Then set choke to 50% and test with a little throttle slowly and gently.
When it gets some revs up, you can take off.
Turn OFF choke 2-3 blocks away when you're moving at good speed.
Should also test petcock, I've seen many that's bad right out of box.
1. unplug fuel inlet line from carbs
2. unplug vacuum-hose going into petcock
3. plug 1-2 foot long vacuum hose into petcock's vacuum-inlet
4. aim fuel line from tank into measuring-cup
5. apply vacuum to petcock's vacuum-inlet
6. let fuel flow for 30-seconds
How much fuel did you collect?
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