The prime lets it fill the carb bowl. With the newer petcock we have to crank-pause-crank-pause-crank-pause , until we get it to fire. Crank makes the petcock open, pause lets the gas fill the carb. Beats cooking the battery and starter.
Right side carb always dries out in about 5-7 days, worse on the sidestand.
Had to change brake fluid on one of my cars last Fall, stuff looked like black coffee, with grounds in it. Totally filthy, original from 2000.
Need the plug boots changed on mine, one is arcing on the throttle cable and at least one other leaks. Clearing up voltage leaks should help your spark and starts. I know mine would bite me, but I can't like electrocution, I jump too hard when shocked, could snap a bone.
Did you get the NGK boots off ebay, or somewhere else? I need to shop.
LOL, Me no likey sparky, not when on my hand. Yes, I bought all 4 NGK boots on Ebay. Cost me about $20 for all 4 with the rubber grommet to seal both ends. Been chilly and rainy again here, so haven't hit the road with them yet. My wires were replaced last fall, so didn't need those.
Also, I always use my side stand when I pull into the garage. I do exactly as you, crank, wait a sec, crank, and it usually fires right up on the front cylinder until right bowl gets fuel. Hate that piston knock sound! It comes out of it quite quickly though once carb gets fuel, then the RPM's climb right up. Too much of a PITA to use center stand every time I drive into garage, knowing it'll be out in a day or two. Ahh yes, the quirks of the mighty VN750. LOL