Not enough information to nail down your problem. If there is fuel running out and no firing then suspect a problem with the glow system. It could be too wet (flooded), have inadequate voltage to heat up, or have a bad glow plug. Remove the plug, test it in your igniter and see if it glows bright. Disconnect the fuel line and purge the motor of excess fuel by turning it over with starter without the plug. If the plug is heating fine, reinstall and without hooking up fuel line, again try to get the engine to fire. If all the fuel was purged, it might not and it might need a slight bit of prime sprayed in the carb ventura. Get it to fire before hooking the fuel line back up.

Once it will fire and run for a second on a prime, then using factory needle valve settings, try to once again hook up fuel line and get it to fire and run.

Good Luck...