Big Flooding/fuel issue on 2002 VFR

Hey Crew,

I haven't been on in forever. I've finally decided to put some time into getting my bike up and going and I'm not really sure where to start. I had issues last summer with not being able to get the bike to start. It would try to start, but would end up puffing fuel and dying quickly. I was in the process of changing out spark plugs and checking to see if I was getting spark from the plugs by cranking the starter with one plug out. On one cylinder, when we tried this, fuel shot out of the spark plug opening. Turns out the fuel injector was flooding that cylinder with fuel and preventing starting. I then noticed that my oil level was very high. turns out the oil was filling up with Gas. I can only assume from being forced around the piston ring while I ignorantly tried starting the bike with a cylinder full of fuel. I haven't done much with it since then, but I'd like to get it running.

I figured I'd start by draining and replacing the oil, I'm not entirely certain where to go from there. I'm sure I should try to figure out if the issue is a stuck injector or an issue with the computer commanding too much fuel. I know this probably seem like a simple problem, but I'm more of a shade tree truck guy with very little motorcycle experience.

What can I do to troubleshoot/repair this?

 

Pull the tank up and remove the air cleaner assembly, you will be able to see the injector tips with a little difficulty and turn the key on to charge the fuel rail. If it is a damaged/leaking injector it should start to leak at this point. It is a bit of a pain as room is tight but it can be done. Make sure you have enough fuel to charge the system with the tank in an upright position.

 

So.............

I take off the air cleaner assembly and turn the throttle to see the front two intake runner completely full of fuel. I carefully soaked the fuel out of the two runners and set to look at where the fuel is coming from. By looking in with a flashlight, I could see fuel coming out of a hole in the front right intake runner below the butterfly but above where I would think the injector would fire. Would this be a leaky O-ring? Thoughts?

On another note, I opened the oil fill cap and fountain of oil/gasoline mixture came out at me. I'm hoping I haven't completely messed up the internals of the motor at this point.

 

Throttle bodies are not really connected, except through vacuum lines, so it is possible that fuel from one flooded port goes to the other. However, since you seem capable of mechanical work, I would pull out entire fuel rail, and test out the injectors themselves, since Toe Cutter is probably right, you have a leaky injector. Various reasons why it could leak, like bad seals, bad needle, but it could also be dirt in the fuel lines, like rust or build up from old or bad fuel. Did you put fuel stabilizer before you retired the bike for a while?

Now, to test injectors, you could re-attach them to the fuel rail and energize the pump, or you could test them with a hose attached to the injector and some source of fluid/gas. Shop air is also possible, but pressure can NOT exceed 36 psi in the line, so be careful if you go this route. There should be enough info on the net to get you through injector testing.

On the side note, there are a few "holes" in the throttle bodies, for fuel, for engine vacuum, and for starter air bypass.

Also on the side note, engine oil diluted with gasoline (or with coolant as well) will still have lubricating properties. So unless you drove the bike or revved it up while idling (it looks you were just cranking the engine and have not even started it), I would say you are safe to assume you had no engine damage. A tell-tell sign of internal damage would be metal shavings in your oil, or on a magnetic oil plug, if you have one.