I don't know much about it. I won't be getting my shop manuals until I get my next second shift paycheck, next week.
Anyhow, on cars there are two ways to check timing, static and dynamic(running)
I expect thats what this means too.
Usually on a car you use static timing to get the thing running and dymamic to make sure the spark advances enough at speed.
On a sled I don't have the SLIGHTEST idea how you'd do it.
I do know that there is a website http://www3.sympatico.ca/ve2fch/page2.html where you can download a form to send off for the manuals for your sled.