SOURCE: Motorcycle engine stalls when cold.
It needs a new spark plug for a start.
I would also advise a new air filter.
SOURCE: Engine stalls when engage in any gear from neutral.
CHECK THE SIDE STAND SAFETY SWITCH IS OPERATING
SOURCE: Bike stalls in high gears when cruising around 45-50MPH
Could be your spark plugs, or maybe your side stand as some bikes if not all of them now have a switch on the side stand which prevents the rider from starting the bike if the stand is extended. So if the spring which retracts the stand is slightly lose, it pulls on the switch and cuts off power. Im not an expert but just check these.
Could also be that your carbs are dirty. So just give them a bit of a service and check for any blockages in there.
SOURCE: Honda Shadow 600 c won't start in gear after battery change
The kickstand switch is either bad or bent out of position. See if you can activate the switch manually. Does the bike run now? If so, the switch is bent out of position. If it still won't run, jumper the wires together until you can replace the switch.
SOURCE: not sure why my bike wont start
How long did the bike set un-used? After years, gasoline turns into varnish after evaporation of the aromatic hydrocarbons. I've actually seen a substance like molasses in all the carbs and the gas tank. Take a bowl off of a carb and see what you find. If it has gone to varnish, you will need to disassemble every component that gasoline touches as a liquid and re-build and clean out the gunk. (yes, gas tank too and the diverter valve) This is a common problem.
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