1985 TRX250 Fourtrax / no fire

1985 TRX250 Fourtrax / no fire ——— I lost fire to the plug , and it won’t spin over from the starter button but will spin if I jump the solenoid , no voltage to solenoid wire from the starter button , seems the two problems are related as it seems to have happened at the same time , all fuses are good and hot , new hot battery , neutral light is lit , the old coil looked like it got hot and melted around the terminal , swopped out the coil for another used one —– how would "you" troubleshot this problem