Have a 1995 vn750 with 12,000 plus miles for two years now. Only mods are v&h exhaust when I got the bike. Been reading all your forums before signig up with nothing working so far, so I thought I put my info In maybe I missed something. Took bike out a week ago for ride and was sputtering and backfiring from idle up to 5000 rpm could not get going would die. Only doing from left exhaust which is the rear cylinder head. Frist thing I put seafoam in started up sat over night no luck. So far replaced rear spark plugs with new, old ones were black and wet. Also checked for good spark on all 4 cylinders. By installing a good spark plug in each cylinder spark plug wire and grounding to head and cranking over bike. R&R carbs (7 times now) disassemble, cleaned blew out any hole I could find (4 times now), inspected for torn or cracked diaphrams, checked and reset fuel levels (4 times now) tried different float levels, made things worse at times.It's at original setting again. Vacuum checked all hoses for leaks. Only found vacuum hose going from carb to air reed valve, replaced same. Tried new battery from my other bike no luck. Swapped front and rear coils no change, still are swapped. Pulled all electrical plugs, found corrosion on regultor/rectifier below battery with corrosoion, cleaned same. Checked rubber boots from carbs to cylinders can't see anything wrong. Only thing I've seen in this forum that's odd on my bike. Is that the vent hose from the carbs to the right ear (air filter). If it is in to far it can get blocked and stall the engine. On my if you put your finger over the end of the hose, the engine will speed up and hold at a higher rpm. Can't figure how it is ding that being a vent hose. So far the only thing I have gained from this which is a feat in itself. I can remove and install the carbs in 20 minutes ansd start the bike.