Firing order 89 d50

[TLady]

Hi, I'd like to know firing order on 89 d50 and any help vacuum lines.

[FMS88]

Firing order for the G54b engine is 1-3-4-2. Cylinder #1 is closest to the radiator. Assuming you have the Mikuni carburetor, look at this thread and its attachments for the vacuum line diagram that applies to the 87-88 models which should be the same for your '89.
http://www.mightyram50.net/vbulletin/showthread.php/8147-1988-mighty-max-carburetor-vacuum-diagram-needed(actual-photos)?highlight=vacuum+diagram

If you have a Weber carb, you only need a line to the vacuum advance. All other lines can be eliminated and the ports capped.