Vibration over 3K - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 7 (permalink) Old 09-23-2018, 09:31 AM Thread Starter
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Vibration over 3K

Greetings, I have not posted for some time but I do read the forum often. I have noticed that I can feel a vibration up thru the seat and at my feet while traveling down the road at cruising speed with the engine above 3K rpm. The cycle has just over 10,000 miles on clock. It is all original except the seat and tires. All the rubber engine mounts seems good with no dry rut.
Is this common and what have you guys done to help with this?

Thanks,
Pat

'99 VN750, all stock
performed driveshaft maintenance
checked the ACCT using the Grambo Trick
Sycned carbs with flow meter
Yuasa YTX14AHL-BS AGM Battery
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post #2 of 7 (permalink) Old 09-23-2018, 09:57 AM
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3k-5k is where most vibrations happen. The engine is typically happiest above 5k, I like to cruise around 4k-6k rpms. It's pretty normal from what I've gathered. These engines are smooth for a v twin but it's still a v twin at the end of the day. Rev it out! these engines are fun when they're breathing

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post #3 of 7 (permalink) Old 09-23-2018, 10:00 AM
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Also, if it's something that wasn't there but just started getting worse and continues to get worse it may be an issue with balance dampers, but I took my engine out to replace them one time and replacing them didn't do anything that noticeable to fix the mild-moderate vibration, so don't feel the need to rush into doing the job, it may not be necessary

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post #4 of 7 (permalink) Old 09-23-2018, 10:48 AM
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Have you seen any chunks of rubber in the oil screen? - damper bushings

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post #5 of 7 (permalink) Old 09-23-2018, 03:35 PM Thread Starter
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ubertalldude, the vibration has always been there since I owned the bike for the past 3,000 miles. Most of the time it does not bother me but this past weekend it did.

Spockster, I have not changed the oil just yet but I'll look for signs of the rubber chunks when I do.

I had switched to a Mustang seat to see if that helped but not really.

'99 VN750, all stock
performed driveshaft maintenance
checked the ACCT using the Grambo Trick
Sycned carbs with flow meter
Yuasa YTX14AHL-BS AGM Battery
NGK DPR7EIX-9 Irridium Spark Plugs
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post #6 of 7 (permalink) Old 09-23-2018, 07:52 PM
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Sounds normal then. mine isn't happy below 4k, I seldom keep it revved down that low because it just doesn't feel like it's in the power band. doesn't sound like anything to worry about, v-twins (except 90 degree v twins) have inherent balance issues, from Harleys to Hondas, they'll all shake a little bit.

edit: I see you mention ABOVE 3k, that still makes sense but I was imagining it as 3-4k is the most vibrational range, that's how it is on mine with fresh dampers anyhow. but yeah even at 5-6k there's still vibration happening, I just don't mind it that much but if I pay attention to it I'm like "huh is this OK?" But I reckon that's bound to change with my mood, haha. at the end of the day we're all straddling an engine strapped to a fancy bicycle, reckon you ought feel SOMETHING when your genitals are less than a foot from a running engine lol

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Last edited by ubertalldude; 09-23-2018 at 07:56 PM. Reason: "above 3k"
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post #7 of 7 (permalink) Old 09-23-2018, 08:49 PM
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The vibration should not be bad enough to bother you. I, and most long term members here, have noticed that the balancer bushings tend to fail if a bike sits for a while, and with only 10,000 miles on the clock, yours has sat for a while. I'd check the oil for rubber debris as Spockster said. When the balancers go bad,and if it is run for a while, it wears a hole in the crankcase.

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