You can try straight seafoam into the carbs, take the 2 fuel lines off petcock, the 2 pointing toward the carbs, the one coming straight up to petcock is the vacume line that lets fuel flow. Drain carbs of any fuel in bowls, there is a set screw for this on each carb, fuel will come out a little nipple, close them back and add the seafoam straight into the two fuel lines, like with a syringe or eye-dropper. Let sit like 24 hrs, drain , put fresh fuel in, I would again with syringe ect and try to start. Ck petcock that it is free flowing fuel! Pull the 2 fuel lines off petcock, pull vacume line off the front carb and introduce vacume to it, literally suck on it a little, if the petcock is ok fuel will literally flow from the 2 outlet nozzles!! Make sure PC is in the ON position!! Or RES with fuel in tank!
04-3,200 miles bought July 2011 with 928 miles. Loaded with acessories to many to list here, see my albums for more details! I also make a custom tank bib specific for the 750 if anyone is interested, ck my albums for some pics.