bobcat - welcome to the forum. :hello2:
Why don't you take the opportunity to introduce yourself in the 'Who are you, where are you from' section and it would also be quite useful if you could update your profile with a location.
If the engine has been out of service for a while then it may take some cranking to achieve a start.
You clearly know what you are doing, no one would tackle a non runner if they were not!
My suggestions would be to ensure you have a tip top battery and maybe even consider using a slave for the initial crank and warm up.
I would try spraying a wee bit of oil through the spark plug holes, trying as best you can to get it on top of the top rings.
Connect a car battery to the bike battery using jump leads and give it another go - this should maintain a good spark and the required cranking speed for an extended period of attempted start.
It would not take long to whip the covers off and check the valve operation makes 'timing sense'.
Let us know how things proceed.