[krbreton]

*Careful with the jump - be sure you know how the cables connect. Too many people get hurt just connecting Black/Black, Red/Red.*

If the jump doesn't work - next thing to check in the debugging chain is fuel delivery. If it's not catching at all, check the petcock (we've all made that mistake), then drain a little gas from the carb bowls (use a small piece of tubing so you don't drain it right onto the engine). If the carb bowl is dry (or close to it), you aren't getting fuel into the engine.

A clear inline fuel filter is a godsend here - you can easily check if fuel is flowing while you try to crank it.