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well its not the ecu ........when i put my ecu back in her i put power on her started her up and started playing with the wires behind the tank seeing if anything is loose or w.e cus i was starting to get very annoyed so then i took the power off and she stayed going on her own i was shocked....but she only was going on one cylinder other cylinder had spark just not getting any fuel so i drover her out of the garage just to see counldnt press the throttle very much she go boggy and almost shut off so put her back in the garage shut her off and started her up and few times to make sure she was still starting up on her own so then i went for some supper was going back out see if i can figure out the fuel problem but couldnt get her to start up on her own again very annoyed .....even with the power on her she still only runs on one cylinder.....
Not saying this is your problem but I had something similar happen to a 900with a newly rebuilt engine. When running we pulled the plug caps to determine which side was down (it was MAG side). Then pulled plug to confirm spark (there was). Then put small amount of gas to see if it was a fuel issue (it was a fuel issue as she ran). We pulled engine again to find that the injector wiring was broken in the boot a few inches from the injector (harness is tied into a 90* or 180* bend). I opened it up, soldered/shrink wrapped it and then taped it up really well, re-installed the engine and everything was ok.
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