late vf1000r really hard to start, seems flooded

Hi everyone, I am a new to VF1000r, I picked up a sandrail with a late vf1000r with only one cdi box. the motor has good sparks, I checked the spark plug cables and they seems to be in the proper firing order. I am not sure the wires to the 2 coils are in proper order, I hooked up the yellow wire to the coil that is connected to cylinder 1 and 3, is it wrong?. When I try to start it, it hard to start but it starts but as soon as the fuel pump start pumping it dies and then it is completely flooded. I took the carbs apart a few times and clean jets and passage and everything seems ok, I checked float and it seems good. It seems to me that the fuel pump is pulsing to many times like on every cylinder and I think it should only pulse on one cyclinder???? I am thinking I am having a fuel pump pulsing problem, maybe because yellow wire is not connected to the proper place????
thank you everyone for the help.

 

For starters forget the fuel pump and use a fuel bottle, so you can see what it going on

 

The fuel pump activates every time a cylinder (coil) fires. If it's flooding I still would suspect the float seat and or adjustment. How did you adjust the float? Here's how the book states it.



The small rod, the spring loaded part that pushes in to the needle, is just touched by the float tang. The pump shouldn't be able to push thru a closed needle/seat valve. Or it's flooding for another reason like bad pilot jet needles or the like (adjustment). Now those and most older V4 did have a hot start problem because the gas vaporizes at times cause the carbs set between the V and doesn't get much air thru that area once shut down and setting over ten minutes or so. I doubt that's your problem in a sandrail.

Does it flood when cold and or hot? That will make a difference in what to look at.

Edit: that didn't work, the book info didn't post.

The carbs have to be at about 15-45 degree angle to adjust the float at 7.5mm height. The little spring loaded rod in the needle just touches the float tang. It does not push in at this point.

 

Yes I did that

Thank you for advice, but I did that and it just does run right even on the bottle. But last night I was looking at electrical diagram and saw that I had the blue and black wires crossed. It was late so I could not start it up, too loud. But I will try today when I am back from work. I will let you know thank you

 

Hi there and thank you for your help, I did check carbs and open them up and cleaned them and adjusted float a few times. Last night I was looking at electrical diagram and saw that I messed up the coil wiring for cylinder 2 and 4, and after starting engine it seems that cylinder 2 and 4 were not firing, their exhaust were still cold when cylinder 1 and 3 exhaust was hot. I check my wiring and it seems that the blue and black wires were flipped, and I think it would make cylinder 2 and 4 to not fire? it was late when I figure it out so I did not try to start it due to noise (its very very loud) but I will today after work and let you know. I really think that it why it was not running properly. thank you again

 

Wires crossed up will not cause it to flood

 

No but a lack of spark will stop the fuel in those cylinders being burnt so you'd get a rich smell like flooding

 

Ok got me there, could be

 

Exactly my thought

Exactly what I was thinking but why is it flooded on all cylinders not just the 2 not running. The thing is the fuel pump keep pulsing when engine starts, should it stop pulsing when bowls are full and then start pulsing again when bowls are empty and pressure is lower? I think the fuel pump is designed this way? So I disconnected the fuel pump from fuel line and connected it directly to a battery and switch it on, it sucked perfectly in the inlet but when I put my finger on the outlet to build pressure this did not stop fuel pump from pulsing, is it normal or do I need a new fuel pump? Thank you in advance everyone, this is hard to troubleshoot

 

Ok so does it run ok using a fuel bottle?

 

I would think the fuel pump simply keeps going as long as the ignition is running. There won't be a pressure or level switch that would stop it so it would keep chugging along with your finger on the outlet. Did your finger stop the flow? Norm's idea about bypassing the pump and letting gravity do its thing is sound; the only reason for the fuel pump is the relative height of the fuel in the tank vs the float bowls when the tank is near empty. If you still have a flooding problem then at least you can cross the pump off the culprit list. I know my VTR1000 has no pump, it is totally gravity fed (plus the huge suction of high fuel consumption!).

I don't have access to a VF1000R manual but I do have the VF1000F which should I think be very similar. The fuel pump flow should be 900mL +/-10% per minute. From the wiring diagram the fuel pump is actuated by a relay, and the relay is actuated off the CDI. Good luck.

 

Ok I have hooked up the tank gravity way to the carbs and cylinder 4 carbs was leaking real bad so it has to be the float, I will take them apart tomorrow and check floats again to make sure, I will let you know, thank you

Ps: I am not using vf1000r fuel filter

 

Needle and seat is not shutting off

 

I must have been drinking heavy that day

Ok I think I know why it keeps flooding like that, very simple I hooked up the fuel line to the pressure line because there was no hose for the fuel line, so I naturally thought the vacuum line was the fuel line. Especially because carb setup are diff than the vf750 I was used to. So yeah hooked up like that it overflow every bowls that is for sure, I went through the carb and made sure everything was good and it is, then I started testing it blowing through the fuel line and right away understood my mistake, lol, big time rookie move especially that I have been fixing my bikes since I am 12 years old, lol, but I guess like everyone I am getting old. Anyway I tested the carbs in with fuel pump on and no flooding anymore seats and needles are doing their job. It's early in az and I have to go to work, but I will be back in a few hours and try to start it, I will let you guys know, thank you again. For the help guys.

 

Ok it was that for sure, it runs great now, I just adjusted carb a little and it is idling properly now, thank you very much,
Sincerely

 

Awesome, another happy outcome.


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