Won't stay runing when I twist the throttle

I own an 87 myself and excellent bike...i had a similar problem but it didnt die right away it just bogged down...it was the fuel pump! i looked in my manual and dont see anything that would cause this particular problem, but im thinking that the throttle is attached to the starter and kill switch assembly....maybe something is shorting out in there?

Fouled plug or wrong gap. Bad wire.

I Also have a 600 hurricane, and mine did the same thing, so if i were you id check the fuel lines going from the tank to the fuel pump,

mine would do the same, idle, then die

i found my line going from tank to fuel pump was cracked, so there was an air leak going on, i was back to full strength as soon as i replaced the fuel line