Is this a fresh rebuild or a motor all ready broken in and just sat for a while? What did you modify or up grade if any thing?
Mine has two carbs and what I was told was I need use the original single carb to break it in, then I could install the 2 two carb system.
If yours a fresh rebuild you will need to prime the oil system and if the cam was replaced you need to follow the cam manufacture break in procedures.
fresh start up If your "Bringing a dead engine back to life" here's one in the tech tips
bringing back a dead engine This is for starters I am sure some more bolters will be able to give more pointers that have a lot more experience. ohhhh don't rush anything if something does not seem right its a good idea to double and triple check it and ask specific questions
