Does anything "interesting" happen in the electrical system around 7500rpm?

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Does anything "interesting" happen in the electrical system around 7500rpm?

This is a discussion on Does anything "interesting" happen in the electrical system around 7500rpm? within the ZR-7 Maintenance forums, part of the Kawasaki ZR-7 category; I'm running a GSXR600 tachometer and the thing is working well below 7500rpm...but above it gets real jerky and stops feeding smoothly. I'm sure there's ...

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  1. #1
    Up-And Comer makenzie71's Avatar
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    Does anything "interesting" happen in the electrical system around 7500rpm?

    I'm running a GSXR600 tachometer and the thing is working well below 7500rpm...but above it gets real jerky and stops feeding smoothly. I'm sure there's some kind of interference, but can't find the source. The ZR doesn't have some kind of funky two stage coil or anything that could be the cause of an electrical draw/noise.

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    Obo
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    It does have a dual coil that fires 2 cylinders at a time (one coil for 2 cylinders) but nothing that should affect it like you said.
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    Supreme Being carryall's Avatar
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    Check your plug wires and/or plugs. Either could be "missing" at the higher RPM's
    Blue ZR7 with...color matched swing arm, heel plates, bar end mirrors, passenger pegs, F&R blinkers with smoked lens, oil cooler with mesh, carbon fibered side covers with mesh, custom made chin fairing, along with a tail trim, LED underbody lighting, Yoshimura RS3 muffler, Corbin seat, F15 windshield, 17t front sprocket, oil temp gauge, rim tape, custom grips, front spring preload adjusters, different handlebars with risers, Ivans jet kit with air box mod and snorkel removal and AIS removal.

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  5. #4
    Up-And Comer makenzie71's Avatar
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    Yeah I bought a spool of 8mm wire and new boots. I felt around the wires as best I could while running to see if there was any arcing and could feel any...I'm not wholly convinced that's it but am pretty stumped to find another source of interference. The only time I've seen anything like it was with my CX500 and the culprit was a bad stator coil (two stage coil and the upper stage was bad causing all kinds of nonsense when the system switched over).

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    Obo
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    unless there's some sort of high end limiting filter on the tach left over from the gixxer that works like a capacitor, saving the signal then puking it out when it gets over a certain threshold. It might be a shielding issue where you did the splicing. All just speculation though. Too bad you don't have another identical tach to try. It might just be the tach.
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