Turn the key on, take a screw driver or a pair of pliers and jump across the 2 terminals, if the bike starts, it's the relay. Be careful, there's a lot of amps going thru there, might see some sparks too. use insulated tool
...and make sure the bikes in Neutral when you do this. Jumping the relay, bypasses all of the safety features to prevent your scoot from leaving before your ready.
If it is the relay, replace it, and get a set of Erbs Full Flow Power Wires for the bike. It'll help take the heat off the relay, and make it last longer.