Hmmm...
recently went through this with my own overhaul. Here's the causes I ran into:
* fuel delivery - do you have an external test tank for your testing? If not get one - you can't work on the bike with the tank on
* seal up the vacume nozzle on #2 if you are running without the tank. Note that if you run for a while without the tank and the bowls drain and then you attach the tank, it will take a while for the boals to refill with the switch set to PRI. If the petcock is set to ON it will take ever longer as you have to keep cranking it to get the valve open long enough for enough fuel to flow. The way I sealed the nozzle: I cut a short length of hose and jammed a think fastening screw into the open end - this was my improvised plug.
* bench sync - do a search for "bench sync" and follow the procedure - but to me this sounds like not enough fuel in carbs.
* float levels - check the floats and make sure they are all to spec - the PO may have mucked with these in some attempt to fix a rich condition - just cause there's fuel in the bowls doesn't mean there enough for it to run
* check idle jet - the idle jet has a microscopic opening which must be clear. Do the idle jet plugs fit snug or are they loose?
* idle mixture screws - start them off at 2 1/2 turns out. But note that some carbs require more turns. On my carbs #1 required an extra turn to run properly while #3 and #4 required about 1 turn only. The PO may have torqued the screws down at some point in an attempt to correct a problem and could have deformed the screw or the channel.
Also when doing this work I first installed an inline fuel filter and kept it attached to the carbs. It made me feel good to know there was a barrier to dust or dirt which could get in there as I dis/connect fuel tanks. The tiniest piece of dirt will cause trouble.
recently went through this with my own overhaul. Here's the causes I ran into:
* fuel delivery - do you have an external test tank for your testing? If not get one - you can't work on the bike with the tank on
* seal up the vacume nozzle on #2 if you are running without the tank. Note that if you run for a while without the tank and the bowls drain and then you attach the tank, it will take a while for the boals to refill with the switch set to PRI. If the petcock is set to ON it will take ever longer as you have to keep cranking it to get the valve open long enough for enough fuel to flow. The way I sealed the nozzle: I cut a short length of hose and jammed a think fastening screw into the open end - this was my improvised plug.
* bench sync - do a search for "bench sync" and follow the procedure - but to me this sounds like not enough fuel in carbs.
* float levels - check the floats and make sure they are all to spec - the PO may have mucked with these in some attempt to fix a rich condition - just cause there's fuel in the bowls doesn't mean there enough for it to run
* check idle jet - the idle jet has a microscopic opening which must be clear. Do the idle jet plugs fit snug or are they loose?
* idle mixture screws - start them off at 2 1/2 turns out. But note that some carbs require more turns. On my carbs #1 required an extra turn to run properly while #3 and #4 required about 1 turn only. The PO may have torqued the screws down at some point in an attempt to correct a problem and could have deformed the screw or the channel.
Also when doing this work I first installed an inline fuel filter and kept it attached to the carbs. It made me feel good to know there was a barrier to dust or dirt which could get in there as I dis/connect fuel tanks. The tiniest piece of dirt will cause trouble.