It seems to run absolutely beautiful otherwise
Perhaps I should check my starting procedure
How long do y wait for the float bowl to fill?.....I assume 30 seconds or less
The design of this thing is such a royal pain in the boules
Its a major undertaking just to pop the plug
That way, I would know for sure if I had too much gas or too little
Your solution is simplest and Karannies I will do after that
I have never cranked the throttle 3 or 4 times....I just assumed that would flood it
Maybe 2 times at the most
Bob....Krannie runs circles around me with his knowledge and experience on the WR450F and CRF450X, but one difference that I am thinking about with his technique is that he lives in Southern California where it is generally quite a bit warmer than Colorado (me) or Connecticut (you)...hence why I think the need to twist the throttle to squirt some fuel into carb throat when it is stone cold and hasn't been started for awhile. Try it. If it works...great....if not....move on to other variations
As far as how long to wait to fill up float bowl....not long maybe 5-30 secs. and that is assuming that it is empty or some fuel has evaporated since you last ran it You just want to make sure there is fuel in the float bowl so that the accelerator pump is actually squirting fuel into the carb throat when you twist the throttle.
I will say that every carbed bike or car sometimes has their idiosyncrasies and you might have to fine tune your starting technique. For example, most people say when hot don't twist the throttle at all when starting, but I found on my WR that if I just slightly open throttle (not enough to create a squirt from accel pump) it usually fires right away. If I open it 1/8th or more, it will not fire and can tend to flood. But, this technique does not work on my buddies '09 WR450F.
One thing I loved about my '10 Husaberg FE450 with fuel injection, is that no matter whether engine was cold, hot, or hadn't started in 2 weeks, 2 days, or 2 months, or I just dropped the bike, etc. it would start right away with no issues and no extended cranking. Never even had to charge the battery. At some point, I will pick up a used 2012+ WR450F and hopefully enjoy that same type of starting performance as my Husaberg with FI.
Lastly, if you are playing around with the fuel screw and changing out the pilot to a 45, make damn sure that you have the o-ring in there properly (and you don't have pieces and parts of a busted up old o-ring stuck up there or have a missing o-ring altogether). The order of the parts on the fuel screw from the tip down (e.g the part you are inserting into the fuel screw cavity is o-ring, washer, spring.
I also found that in winter time with the JD Jetting kit installed/adjusted per instructions in the kit (for high altitude) with the 45 pilot jet that my exhaust pipe was getting so hot that it was softening/melting the underside of the airbox because it was running so lean. I put in a 48 pilot jet (with JD needle at recommended setting) and it didn't run nearly as hot and runs great even at high altitude. And, of course everything I read says that I should be running the 45 pilot. And, my buddy runs the 45 pilot jet in his WR450 and works great for him. So, my only point is to play with it and find what works for you. And I also agree that instead of running the 48 pilot at 2.5 turns out, it would probably be better going down a size on the pilot and turning the fuel screw in (e.g. starting at 1 turn out and adjusting from there - at least on paper and based on everything I have read).
Good luck finding/resolving your issue.