Engine Vibration - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 11 (permalink) Old 03-06-2010, 09:36 PM Thread Starter
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Engine Vibration

I took my 2005 750 out for the second ride of the new year today and the engine seemed to vibrate more than I seem to ever remember. The bike only has 1300 mile on it so it doesn't seem likely that there should be something wrong with it already like balancers. Any feedback?
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post #2 of 11 (permalink) Old 03-06-2010, 09:59 PM
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Start with the simple stuff: Are the engine mounts tight? no worn out bushings?

How long has it been sitting with out running?
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post #3 of 11 (permalink) Old 03-06-2010, 10:16 PM
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I only fired mine up today first time since november and it seemed to vibrate a little but I hoping it justs need blown out a little from sitting and it also has 35,000 on it.
as for yours only having 1300 miles on it I wouldnt think it could be nothing major, whats it idling at?

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post #4 of 11 (permalink) Old 03-06-2010, 11:06 PM Thread Starter
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I guess I will check the engine mounts tomorrow. It has been setting since last October. I did start it up a couple of times over the winter. I also took it for a ride on Friday and didn't notice this vibration. It is idling at about 1000. The vibration seems to be the worst when cruising at about 50-55 and smooths out at about 65mph.
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post #5 of 11 (permalink) Old 03-06-2010, 11:54 PM
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An '05 wouldn't have a bad balancer unless it was installed wrong at the factory, and then it would have always had this problem. Loose motor mounts can cause vibration on most bikes, but remember, the Vulcan 750 has a Rubber mounted engine, so that shouldn't be it. My best guess would be that the vibration is due to a misfiring engine, but if it didn't do it yesterday, that seems unlikely. I have my idle set to exactly 1,000 rpm on the tach, but had to open the idle A/F screws 3 full turns to get a steady idle at that speed. Jerry.

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post #6 of 11 (permalink) Old 03-07-2010, 12:06 AM
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I had two vibration issues in the past. One was solved by properly torquing the handlebar mounts. The other was from a vibration I felt on on my right foot. The brake pedel was just slightly touching the footpeg and needed to be moved just a hair away. I could see a small area under the brake pedal where the vibration wore into it. Once I moved it a hair the vibration went away.

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post #7 of 11 (permalink) Old 03-07-2010, 12:13 AM
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Quote:
Originally Posted by VN750Rider/Jerry View Post
An '05 wouldn't have a bad balancer unless it was installed wrong at the factory, and then it would have always had this problem. Loose motor mounts can cause vibration on most bikes, but remember, the Vulcan 750 has a Rubber mounted engine, so that shouldn't be it. My best guess would be that the vibration is due to a misfiring engine, but if it didn't do it yesterday, that seems unlikely. I have my idle set to exactly 1,000 rpm on the tach, but had to open the idle A/F screws 3 full turns to get a steady idle at that speed. Jerry.
Hence I suggest he should check the bushings as well as the tightness on the bolts. if the bushings have excess dry rot showing, chances are that the insides are worn out pretty good too, but like you said, if it did it today, but not yesterday...probably not that.
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post #8 of 11 (permalink) Old 03-07-2010, 12:23 AM Thread Starter
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Slim, I would hope they are not dry rotted. This bike has been garaged it's entire life (five years). I will look at them tomorrow and see what they look like.
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post #9 of 11 (permalink) Old 03-07-2010, 12:34 AM
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Rick, where are you feeling the vibration? Under you butt, on your hands or on your feet, or everywhere. I ask this to see if you can pinpoint the source of the vibration. That's why I posted above with my past vibration issue. I checked the engine bolts and bushings and they were fine. So if it isn't that, it must be somewhere else that's causing it. Could also be your tires need balancing. Your front tire especially can cause vibration if not balanced properly.

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Kawi tank bib
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Small windshield
DEKA M/F battery
VN750.com Grill Cover
LED license plate frame
Clear Alternatives LED brake light
Cortech mini tank bag on rear rack
Pirelli MT66 Tires: 110 front / 150 rear
Splines lubed when tires installed at 10,650 miles
Splines lubed again at 14,400 with stubby valve stem install

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post #10 of 11 (permalink) Old 03-07-2010, 01:07 AM
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Had you been starting it up while you had it parked. Did you add stay bilt of some kind to your fuel while it hybernated? Chances are that the carbs are causing some miss firing. Maybe a fuel treatment of some kind will help. Most people here use sea foam. I like a bit of b-12 best. I also use a bit of water remover. Hope your bike gets better.

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