Hi I need the firing order for my 1985 fz400r, I don't have a manual

Same as any other il4 I'd say, 1 3 2 4
Coils serve 1+4 2+3

Use a 1wg manual

To be sure, take the cam and genny covers off hand crank the engine and watch the inlet valves open. You can check the valve clearances at the same time.