Motorcycle Questions? Ask a Mechanic.
Hi and welcome to the site, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.
Initially, what year please?
Still, there is no fuel pump on most carb version.
A common cause of poor or no fuel feed would be a clogged strainer filter that feeds the fuel valve and this would be inside the tank.
In some others, it may be a float issue and/or the needle valve that the float controls. These duo controls the flow of fuel inside the carb.
Fuel into the carb can be checked by draining the contents of the bowl.
In some others, there may be a vacuum controlled fuel valve that would only allow fuel flow if the engine is running hence vacuum at the intake manifold.