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VTR1000 with strange "miss" at 5000rpm

Old 03-12-2005, 03:16 PM
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Re: VTR1000 with strange "miss" at 5000rpm

Pull carbs again. Remove tops and pull slides.check for SMALL holes or tears in diaphrams. I have had the same symptoms before and that is what I found. It wasn't on the Hawk but a vertical twin. It would take throttle to a certain RPM and if you tried to give it any more it would start missing and just plain not go any faster. under that RPM it ran perfectly. What would happen is that the diaphram would pull the slide so far the loose vacum and the slide would just flutter up and down. Diphrams came attached to the slides(pricey). After I replaced it,bike ran as new again. One more thing to check are the spark plug caps. Not sure if the Hawk has them or not but some bikes spark plug caps have an adjustable resistor built into the cap. Sometimes they fail. But being that it happens at the same RPM I'm leaning toward the carbs.Good luck and let us know what you find.
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Old 03-13-2005, 02:34 AM
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It is likely an ignition problem and quite likely a bad coil. As revs increase the coil has less time to charge between firings giving the symptom you describe.

It may also be further back in the ignition system. However it could be as simple as a loose primary connection, bad ground, or loose sparkplug wire.
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Old 03-14-2005, 06:13 AM
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Happy to help.
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