Will not start unless primed thru sparkplug, than stops when that fuel is gone. repeated this several times,will not try 2 stay runing even with choke fully on.

I would say it's fuel supply problem. Most bike carbs have a screw in the bottom of the floatbowl to drain it. Loosen it and see if fuel runs out . If not remove the fuel hose from petcock and see if fuel runs out when you try to start the bike if it's vacuum operated petcock otherwise you have to select reserve by moving pointer to straight up. If the bike has been sitting for several months you need to drain the fuel tank, remove the petcock and clean the screens on it, remove and clean the carburetor. If the petcock has a vacuum hose connected to the back of it check it for cracks. You can always isolate a fuel problem by spraying a little fuel into the carburetor intake to see if it will run. I remove the sparkplug and prime the motor thru the sparkplug hole. If it tries to run you know you have a fuel supply problem.

All that is needed here is to turn the ignition switch on and off several times, Then go ahead and try starting the engine. If no start, repeat the on off procedure again. This should prime fuel injectors

Bad fuel pump,my Nissan truck will start on less than a gallon.

Hi
You can insert a primer system into your fuel system
Just follow the fuel flow below
Please take time to rate me
Bud

needs new fuel pump or fuel line is sucking in air

the fuel pump circut will prime for 2 or 3 seconds when you first turn on the key then stops until you crank it the circut has to see rpms to continue the pump voltage i would see if the pump works when cranking check for injector pulse

'85's mostly had 4 cylinder engines, 22R, 22RE and 22REI. Remove a sparkplug wire and stick a sparkplug into the end. Hold the sparkplug, preferably with a well insulated glove, against a good metal part (exhaust manifiold will do, no paint or rust) nearby being carefull to stay clear of the fan. Now have someone turn the key and when the engine turns, see if a spark is jumping across the sparkplug your are holding...snap,...snap..snap....is what you should see and hear. If not, your ignition is not creating spark. Remove the center wire of the distributor and try to put the sparkplug on the end of that wire and repeat the previous test. If you get spark that means the distributor cap is not transferring the spark thru it to the wires that go down to your sparkplugs. Remove and replace the distributor cap and the rotor inside paying special attention to mark the wires and where they plug into the cap. The rotor only goes on one way, same with the cap. If you dont get spark coming to the center wire of the distributoe cap your ignitin module may be bad, a good time to have a shop run a test on it. Before heading to the shop, be sure to check your fuses. Maybe you should do that first as it is the simplest. If you have spark at the sparkplug and still no starting, a small amount of gasoline poured into the intake ( please dont pour a cup of gas into it! Just a spoonfull or so). With the sparkplug wires inplace, crank the motor. If it kicks and then goes back to cranking with no results, your fuel isnt getting to the intake. Could be a fuel pump (common) or a plugged fuel filter. The filter is easy, replace it. To test for fuel pressure you will need to locate the fuel line coming to the intake, carburated or injected, the inlet can be loosened and have someone turn the key on and you should see some fuel leaking around the fitting you only loosened. DO NO REMOVE IT-JUST LOOSEN. If you have fuel pressure your problem needs a mechanic. If no fuel pressure it's time to check the fuel pump thru the access panel under the backseat. BE SURE TO TIGHTEN THE INLET FUEL FITTING AT THIS POINT. Good luck.
REMEMBER- GASOLINE IS VERY DANGEROUS. DO NOT PERFORM THESE DIAGNOSTICS UNLESS YOU FEEL TRAINED ENOUGH TO DO SO AND ALWAYS WITH AN EXTINGUISHER ON HAND.

Check you injector seals,you may be losing pressure in the fuel lines

The tube in the bottom of the carb. is probably clogged. Remove the carb, and bowl and try spraying WD-40 through the tube, it should spray into the venturi if it doesn't try using a tip cleaner to unclog the tube.

try pulling the plug out on the idle air control valve then start it if thats not it try the map then the idle control