Motorcycle Questions? Ask a Mechanic.
Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, consider (re-)starting back with the basics on the issue of "...won't crank..."; inspect the battery, fusible links and ground lines and/or check/clean the battery cables + terminals, connectors and wiring as a preliminary consideration.
Have the battery externally charged and then LOAD TESTed (even if new and just for the purpose of eliminating it as a suspect).
Locate with the starter solenoid. To locate the starter solenoid, start by following the big cable from the + terminal of the battery as it always ends up tied to 1 of the 2 big terminals of the starter solenoid. Jump the 2 big terminals of the starter solenoid. If it still will not crank, then possibly a cable and/or terminal fault or in some instances, a starter motor issue.
If it will crank and have spark, then wet the sparkplug tip with raw fuel. Attempt to start again.
What happens if "...wet the sparkplug tip with raw fuel..." ?
Is there suction at the carb mouth when attempting to start?