Forklift help?

we have this forklift at work that is temorarly not working and i was wondering if anyone had some advice on how to fix it.



its a 4 cylinder. Komostu

we changed the Battery, Spark plugs, plug wires, distributer cap, everything inside the cap. and it still won't start. the carb. is a bit drty, but i would not think that would hurt it too much.Forklift help?
The way to determine whats wrong is check these things in this order. First check for spark. Use a tool, or get a co-worker to hold the coil wire while starting.(you'll know if theres spark or not by thier reaction) Next check fuel. Spray some starting fluid into the carb. If it starts with the starting fluid and wont stay running, you have a fuel problem. If both of those things check out check compression. You'll need a guage for that. Auto Zone will let you borrow one for free. You just have to put a deposit on it.

After you check these things you'll have a good idea on what to fix.Forklift help?
one thing you didnt tell us was what type of fuel it used.

regular unleaded gas, deisel, or lp gas? if its lp gas there is a lp gas regulator between the tank and the carb, it will have a button right in the middle of it. push it and see if it spits out air, sometimes these lp gas forklifts get are in the fuel lines, and they wont fire for nothing until u relieve the air.