Don't use synthetic oil for break-in. It's too slippery. Also, over here YamaLube has a bad reputation. We use RotellaT4 for break-in, and 2 oil changes after that. Then either continue with it or switch to RotellaT6, is a synthetic. I think it's made by Shell and may be what you're talking about, but whatever you use be sure it's "wet clutch" compatible, labeled as JASO as Morphrider says.
There is a sticky about float adjustment called "clear tube method". No need to remove carbs to check the float level.
Listen to Morph about batteries as I have no clue what's good or bad.
I purchased a 4L yamalube oil bottle, put half in for the breaking and now the first oil change i think ill have enough as i have 2.5 litres left in that same bottle. I will just use that.
I also checked the oil bleed hole at the top head and when it was started i unscrewed the bolt a little bit and oil poured out ! PERFECT it has oil where it needed to be.
I will adjust the floats then give the quad a proper break in and assemble all the lights, plastics back on.