Need advice please - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 23 (permalink) Old 09-12-2016, 11:13 AM Thread Starter
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Need advice please

I have a Vulcan 750 2002. It picked up a bad vibration within the last two weeks so much my right foot gets really numb. SHe also wasnt running right, hesitating, low on pickup at times, so even after sea foam I decided to pull the carbs and clean them. They were gunked up a bit and after a bit of learning experience they are on the bike again and it runs great... But the vibration is still there. I bumped one of the coolant hoses into the rear cylinder so I had to drain some coolant and replace the O ring. I noticed in the coolant metal filings or shavings. Looking on the diagram the water pump is directly beside the right footpeg. I am wondering if anyone thinks or had this problem that the impellar is causing the vibration. Has anyone changed this? How much time is involved. It doesnt look that bad to do. One more thing, I read somewhere on this forum that if the oil is overfull that that could cause vibration. When I bought it used from the dealer earlier this year I noticed that the oil is wayyyy full. I asked the dealer and he said it was fine and they fill all their bikes that full. I dont believe them. All info I read says fill between L and H when on centerstand. That is why I may take her to a private shop if I can find one. Actually if I can do it myself, I would. Its hard to find good reputable mechanics especially the dealers. Sorry to ramble but the oil is free of debris. I dont think it is the dampeners. Any thoughts. BTW engine mounts seem tight.
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post #2 of 23 (permalink) Old 09-12-2016, 02:11 PM
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I would say probably old rubber in the engine mounts is the source of your vibration, but you could also put a vacuum gauge on the cabs to make sure they are in sync. If there are metal shavings in your coolant you probably do need a new water pump and a coolant flush, but that's not necessarily a symptom/cause of the vibration.
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post #3 of 23 (permalink) Old 09-12-2016, 02:51 PM
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You need to ride a sporty sometime if you want to know what vibration is. No VN can ever vibrate as much. My pegs are like giant rubber cushions. Without them it would be impossible to ride for more than a few miles. So don't get too freaked out about the vibes. Check the bolts on the peg and make sure they are secure. Sometimes it's that simple.

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post #4 of 23 (permalink) Old 09-12-2016, 04:39 PM Thread Starter
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Yes I have heard that about the Sporty. The carbs are synced. It just started doing this a lot, more that what I think is normal.
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post #5 of 23 (permalink) Old 09-12-2016, 06:47 PM
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Haven't read of any vibration from the water pump, but it does involve bearings and a shaft.

I wonder if the oil screen was pulled from the left side and what it looked like. If not, I'd want to see it to be sure it's not vibrating from the dampers.

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post #6 of 23 (permalink) Old 09-12-2016, 06:48 PM
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Balance dampers is another thing to consider. When they wear out the engine vibrates more, and it leads to some pretty nasty failures.

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post #7 of 23 (permalink) Old 09-12-2016, 07:48 PM Thread Starter
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I was wondering about the dampers. I put 4000 mi on since March and at the time the oil was really clean. It is very dark now but I saw no debris. I could take a look at the screen.
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post #8 of 23 (permalink) Old 09-12-2016, 07:50 PM Thread Starter
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Is there any way to check dampers? Is inspecting the screen the only way?
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post #9 of 23 (permalink) Old 09-12-2016, 08:49 PM
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Rubber from deteriorating dampers will collect in the oil screen. If the damper gear is grinding the case, there will also be aluminum shavings. The gear will eventually cut a hole in the side case once the dampers fail completely.

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post #10 of 23 (permalink) Old 09-12-2016, 10:29 PM
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Engine mount bolts can be tight, but that doesn't mean you can't have loose rubber from shrinkage. (TWSS)

High engine oil will definitely not cause vibration... nor low oil.. nor any other fluid levels. Keep the oil level within spec. No need to overfill on this engine, and don't go back to that "mechanic". It's not a Chevy 2.2. If you mean check the oil yourself, for sure. Do that regularly. You still have a centerstand, right?

I'm not sure on this engine if you can scope to physically see the balance dampers. If you can, do that.

Metal shavings are a really bad sign. Like others said, inspect the screen, and did you cut open your oil filter too?

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