Bike started up...now won't stay on . . .

[Truthalive7]

Hey guys, I had a salvage bike, and it has been hell getting it to start, but I am proud to say that today my new fuel pump came in and the bike cranked up! It had trouble starting at first, then I got to where it would idle just fine, and then I even put it in first and made the wheel spin in gear while on the stand! I was so excited, but now all of a sudden it will only stay started up for about 1 seconds. It cranks and starts up and then just dies. I was so excited and now I don't know where to begin on the diagnosis of this new problem. Any ideas guys? Thanks . . . .

 

[godminus]

Hey guys, I had a salvage bike, and it has been hell getting it to start, but I am proud to say that today my new fuel pump came in and the bike cranked up! It had trouble starting at first, then I got to where it would idle just fine, and then I even put it in first and made the wheel spin in gear while on the stand! I was so excited, but now all of a sudden it will only stay started up for about 1 seconds. It cranks and starts up and then just dies. I was so excited and now I don't know where to begin on the diagnosis of this new problem. Any ideas guys? Thanks . . . .

Do you have any gas left in the tank?

 

[nimzotech]

Needing re-jetting?

 

[tuningfork]

check for any stored codes?

 

[Truthalive7]

There is gas in the tank, I'm not sure how to check for codes . . . . CEL was off when it first started up....

 

[RJ2112]

Does it have engine oil? Not trying to ask a stupid question.... as I understand it, most FI bikes will not run, with low oil pressure. If the ECU doesn't get a reading from the sending unit, it would start, expect to 'see' pressure and continue to run.... no pressure, shut off the motor.

 

[fredraction]

How old is the gas? Assuming it's new, it sounds like maybe a fuel problem; maybe clogged injectors.

Put brand new gas in and a full load of Seafoam and see if you can get it running long enough to run enough cleaner through the system. A (little) squirt of starter fluid in the throttle body can do wonders.

 

[04fizzer]

Make sure the hoses under the tank aren't kinked. If they're kinked or plugged, it'll create a vacuum inside the tank, and the bike won't run.

 

[Truthalive7]

Weird. After I posted this thread the bike started back up without reason, ran and idled fine for about a week straight (tested every day), and then yesterday quit working again! Yesterday it would start up for about a second and then die, today it won't start at all....starter will run forever. When it ran there was no check engine light on, bike has 2 gallons for fuel, battery is strong, oil level is slightly above the top mark (without bike running) vaccum lines are unobstructed..... I just can't figure out why it is being so fickle!

 

[tweak89]

Have you checked to see if your throttle bodies are in sync?

 

[tomari]

just have a look at the engine kill sensors like side-stand, lean angle, clutch/gear, kill switch you never know....some of them could be damaged and only a little vibrations from the engine could open/close them, also headlights short sircuit or something, this should blow up a fuse but you never know....an other reason for cranking forever and not starting up is the immobiliser

 

[Truthalive7]

Have you checked to see if your throttle bodies are in sync?

How do I check that?

 

[abraxas]

Another arb thing to check: air filter?

You mention it's a salvage, so it would be safe to assume everything is dirty. Fuel, fuel filter air filter etc.

Double check all electrical plugs, battery connections etc.