[xoYoungGunox]

Hey guys, New to the Ninja forums. Tried getting some locals answers on this problem im having and after no luck decided to bring it to the net. Ive got an 07 650r and a few weeks ago lost power to the right leg cylinder or so i thought at the time. got it home and found that it is over fueling itself. I can let it run for 30 seconds and it just pours out unburnt fuel from the pipe and even drips a nice trail out of the clamp on the pipe too. First thought, fuel injectors are stuck open, replaced em and nope (even my buddy at yamaha saw a pic of what im talking about and said bad injectors). So after that failed im not sure where else to go cuz its got spark and compression. ill try and post a pic with this so you can see. The stream of what looks to be water is unburnt gas that went into the exhaust and poured to the ground. Sorry for this long post. just figured this is my last shot before i make this thing a bayou decoration.

 

[jkv45]

Did you buy new injectors? You could swap them side-to-side and eliminate them that way.

There are only so may ways the fuel can get to the TB and into the cylinder.

Not sure I have any suggestions other than injectors...but I'll think on it...

Can you look down the TBs while it's running and see fuel pouring out? Post some more info and photos if you can.

Change the oil when you get this figured out.


Jay

 

[xoYoungGunox]

@jkv45

Thanks for the reply. I will post more pics. If i run it while looking down the TB you can see the left cylinder fogged up after i shut it down and the right cylinder just soaked wet (left pipe will scortch your fingers and the right pipe is cold as ice. Tried the swapping injectors sides and that had no change. One wierd thing though, if i swapped injector wires the the right cylinder had the fogged up look and the left one now soaked (although it wouldnt fire up for obvious reasons) but just an obvservation I noted. But yea i mean the only thing providing fuel is a pump, lines, a rail and the injectors so there can only be so many areas for error to occur and i wouldve thought over fueling would be from a faulty injector not closing when it should ( or mayyyybe an ECU telling it to give more fuel than it should?? )

 

[jkv45]

Interesting. So when you switched the wires the problem switched sides?

Does it backfire? Did you check for spark on the cold side?

Sounds like it may be an ECU issue (telling the injector to stay open) with the strange way it is acting. I would try to check the voltage on the wires going to the injectors and see if they are different (I would think they would be at this point). To me, the fact that the problem switched with the wires eliminates everything past that point as the main problem and points to the ECU or something in the control system.


Jay

 

[xoYoungGunox]

@jkv45


Alright so I was messing around with my volt meter and took the injector connections out. So, the cylinder the is running gets .47v while I crank on it, and the super flooded cylinder has 10.5 - 11.03v going to it while cranking. Leaning towards an electrical issue now so maybe ECU or voltage regulator. Those regulators are pretty cheap so ill look at that and if not start looking at ECUs

 

[morgan46]

@jkv45

Alright so I was messing around with my volt meter and took the injector connections out. So, the cylinder the is running gets .47v while I crank on it, and the super flooded cylinder has 10.5 - 11.03v going to it while cranking. Leaning towards an electrical issue now so maybe ECU or voltage regulator. Those regulators are pretty cheap so ill look at that and if not start looking at ECUs

Regulators are a common problem on alot of bikes !

 

[xoYoungGunox]

@morgan46

Lol it's rediculous, my buddy was with me while I was doing electrical tests and I said we'll maybe the voltage regulator is letting too much to the injector connection and he said "yea dude every bike I've owned I'm telling you that stupid regulator went out on every one". Well I ordered one 16$ so well so what effect that has about wed or thurs. hopefully this will end up as a thread helpful to other ppl.

 

[morgan46]

@morgan46

Lol it's rediculous, my buddy was with me while I was doing electrical tests and I said we'll maybe the voltage regulator is letting too much to the injector connection and he said "yea dude every bike I've owned I'm telling you that stupid regulator went out on every one". Well I ordered one 16$ so well so what effect that has about wed or thurs. hopefully this will end up as a thread helpful to other ppl.

It's something that's stupidly cheap and made stupidly cheap ....a few more invested pence and They would be solid !

 

[Slippery750]

My '08 650r did the same thing. The injectors are triggered by the ECU switching the ground on/off. Unplug the connectors at the ECU and use an OHM meter to make sure the wire is not grounding out between the ECU and the injector plugs. Next u can turn the ignition on with the tank/fuel disconnected and see if the plug at the injector has a constant ground signal and if the other injector does not. This is the same way a shop would trouble shoot this issue.

Have you by chance done any electrical modifications to the bike recently? I did the "pair valve mod" and this very issue came up and fried my ECU. Mind you against my better judgement and electrical knowledge I followed some ignorant people's advise after my resistor failed to trick my old ECU I "just connected the wires together", not good. I replaced my ECU with a used one off eBay and stuck my plugged pair valve back on, she now runs like a champ!