On a ninja ex250 I recently purchased I noticed the vacuum hose which attaches to the pet cock to actuate the flow of gasoline to the carburetor was detached at the connection to the petcock.
When purchased the bike started up instantly without choke and drove great at highway speeds for about an hour and shifted fine through all the gears. No choke used to start no overheating or noticeable rough idle, petcock was set to the on position.
After a more through look over in the garage and starting and stopping the engine several times, the bike was idling quite high ~3k rpms, it would stall when using the clutch to assist walking the bike in 1st gear, and eventually refused to start at all which led to a closer examination.
I noticed the (clear) vacuum hose was not connected where it hooks up to the petcock. After reconnecting the hose to the petcock the bike will no longer start, it will crank until the battery would die. Only once did it sputter then die out. There is plenty of gas and plenty of charge in the battery, starter does not seem to be an issue clutch is fully disengaged and bike is in neutral on the center stand without the kick stand up and out of the way.
How can I get the bike running again after this occurrence? being somewhat of a noob to carbs and motorcycles in general it would be nice to know where the petcock, choke, and throttle should be set when cranking the engine in a relatively warm climate 75 to 85 degrees F.
Is the motor/carb flooded or perhaps missing fuel? The same for the amount of air? If any of this is true how do I correct the fuel to air ratio?