[Clint]

Why prime? It's usually only for after storage when the carbs are dry. If your plugs are being fouled, it probably means you need carb work or your valvetrain is leaking oil.

30 weight oil is reeeeaaaally heavy for a motorcycle engine. Check your manual or elsewhere on this. It won't likely help your starting problem, but it'll turn over a lot easier.

To pop start it, don't bother trying to shift. Put it in first (second if the engine compression is causing the rear wheel to drag), hold the clutch, run, pop the clutch. MAKE SURE THE KEY IS ON. Don't ask how I know.

If it takes that long to fire with the battery charged, though, you likely won't get it to fire with the few seconds a pop-start offers. Sounds like you have a fuel or spark issue.

You won't foul the plugs much using the choke to warm it up. Only if you leave it on to aid idle. If you need to do that, the carb(s) need work. How old are the plugs? Old plugs not only get dirty, but the gap wears open. Eventually, you won't have enough juice to create a proper spark.

Try new plugs of the correct type and with the proper gap. Check fuel filters for cloggagenessation. Get the correct oil in 'er. Clean the carbs, synchronize them and tune them.

How's that for a bunch of random whatnot? Good luck.