Unique Situation

897 Views 8 Replies 4 Participants Last post by thepattonman, Mar 2, 2015

thepattonman

Discussion Starter · Feb 22, 2015

I have a different situation. As most who know me, I build karts with motorcycle engines. This is the first time I have used a FI engine. It is a 2008 zx6r. I got this motor from a wrecked bike.( Hate that) All I got was motor, all the components for the motor and the harness minus the ignition or key switch. I was told that the motor was running after the wreck. I know how to by-pass the down sensor, got a servo buddy for the exhaust valve. I'm having a problem with the fuel. Since I am using a after market pump, I keep getting a low fuel indicator on the tach and a FI light. When I pull the codes it doesn't give me any. Not sure if that is keeping the motor from running of if I have another issue. I was wondering if there is a way to bypass or fool the ecu into thinking the factory pump is there? Anyone got any ideas??? Thanks for the input.

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NatBrown

· #2 · Feb 23, 2015

The low fuel warning won't keep the engine from running. It's just that, a warning to let you know the fuel level in the tank is low. A look thru the service manual should let you figure out what the ECU is looking for on that circuit. A resistor in the circuit most like will eliminate the warning light. But I doubt it will get the engine running. There is probably some other issue that is causing it to not run.

Besides the tip over sensor, there are the side stand switch, the transmission neutral switch and the clutch lever switch that all need to be correctly by passed and can cause it not to start or run. None of those issues will throw a FI code either.

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NatBrown

· #3 · Feb 23, 2015

Also, just to ask it, was the engine off a US bike? It wasn't something that came from a doaner bike that was sold in another country was it? I ask because most bikes sold outside the US have an immobilizer on the them. They will not run without the ignition switch and the key that was coded to that bike.

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thepattonman

Discussion Starter · #4 · Feb 24, 2015

Got a little farther today. My son told me that in his haste he hooked the battery up backwards. At least he was smart enough to replace the fuse with the spare. Now my concern is that it has fried some diodes in the relay or maybe even the ecu, Cause now when you turn the key on and shift into gear the lights flicker on the tach. Any ideas

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thepattonman

Discussion Starter · #5 · Feb 24, 2015

It is a local bike, I know the shop that dismantled it. However, they are no longer in business. At this point I'm commited, so I purchased all new electrical componets, all available bypass or elinimators and a new ECU. I figure I will use the parts one day so what the hell.... I am thinking the ECU is the main culprit, so I am gonna start there.( Sometimes I have more money than brains, hard to believe I am a engineer and I cant figure this out)

I just want to say that everyone has been a wealth of knowledge and all the posts are valued information.

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thepattonman

Discussion Starter · #6 · Mar 1, 2015

After purchasing all new electronics and the engine still not running, I fell back on to my electrical experience and had a light bulb go off in my head. Some systems on these bikes require the ground to be used in order for other systems to operate. {Black/yellow} Since I am using an aftermarket external pump MSD 2225, the fuel pump circuit remained open. This in turn would not allow the FI to operate. I found a fuel pump with similar amp draw as the factory pump. As soon as I hooked it to the fuel pump circuit. Bang!! the engine sputtered. Pulled the air filter and with the help of some starting fluid, she is running!!!!

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noobZX6Ryo

· #7 · Mar 1, 2015

thepattonman said:
After purchasing all new electronics and the engine still not running, I fell back on to my electrical experience and had a light bulb go off in my head. Some systems on these bikes require the ground to be used in order for other systems to operate. {Black/yellow} Since I am using an aftermarket external pump MSD 2225, the fuel pump circuit remained open. This in turn would not allow the FI to operate. I found a fuel pump with similar amp draw as the factory pump. As soon as I hooked it to the fuel pump circuit. Bang!! the engine sputtered. Pulled the air filter and with the help of some starting fluid, she is running!!!!

Be sure to update us with pics and videos...you know...for science

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yellowdart31

· #8 · Mar 1, 2015

noobZX6Ryo said:
Be sure to update us with pics and videos...you know...for science

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thepattonman

Discussion Starter · #9 · Mar 2, 2015

I will get it up as soon as I can.

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