Ringing noise - Page 3 - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Engine / Exhaust / Cooling
\ From the radiator, through the case and out
the exhaust. If it has to do with the cooling,
engine or exhaust, discuss it here!

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post #21 of 29 (permalink) Old 08-05-2018, 09:14 PM
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Stupid washer!

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post #22 of 29 (permalink) Old 08-06-2018, 06:41 AM
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Good to hear you got yours solved.

I found out yesterday what the noise was on my bike. I randomly decided to release my handlebar and what do you know. The bolt sitting right on top of the upper steering stem (don't know if that's the right word?) under the handlebar mount was unscrewed like an inch! The washer sitting underneath it was the ratteling s.o.b. Tightened it all down and the worst noise is now gone. There still is something else making a lower, quieter ratteling sound but it doesn't bother me as much.

Here's a short vid to show what I'm talking about

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post #23 of 29 (permalink) Old 08-06-2018, 07:57 AM
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If it occours at a specific engine speed (whether moving or not) it's a harmonic vibration. Could be a lot of different things. Heatsheilds, cables, licence plate, and even something loose in the gauges or headlight bucket.
I have a weird "buzz" on my bike that I've found to be caused by the windscreen at a certain RPM. Honestly I just wear earplugs and don't worry about it. If it's always at 5,000 rpms, seems like you got a nifty shift indicator
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post #24 of 29 (permalink) Old 08-06-2018, 08:12 AM
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I found and fixed mine. Might be worth looking at. My front gas tank bolts/washers vibrate on the tank tabs, I could press or pull on the tank while riding and it would go away. I added a big washer under it to keep it tight and it's gone! Now I can hear the other side starting to do it, one more washer and I should have it!!
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post #25 of 29 (permalink) Old 08-06-2018, 02:58 PM
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Quote:
Originally Posted by lugnut1009 View Post
I found and fixed mine. Might be worth looking at. My front gas tank bolts/washers vibrate on the tank tabs, I could press or pull on the tank while riding and it would go away. I added a big washer under it to keep it tight and it's gone! Now I can hear the other side starting to do it, one more washer and I should have it!!
I had this issue as well. For me it was more of a clunky noise. I had some old rubber tubing lying around, just about the right size. Just stuck it in there to replace the old rubber bushings. Works like a charm.

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post #26 of 29 (permalink) Old 08-14-2018, 08:19 AM Thread Starter
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Finally found it. A broken fan motor bracket. Welded it and Noise greatly went down!
Still sounds like there is another loose smaller washer. I'll try pulling the handlebars like the one person suggested.
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post #27 of 29 (permalink) Old 09-01-2018, 10:19 PM Thread Starter
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After welding the broken bracket, the other two legs of the fan motor bracket broke and made an even worse noise! Rather than fixing it I replaced it with a good used one.

After fixing that, I got another metallic ringing noise. The forward cylinder head coolant pipe bracket broke. Lucky it didn't pop out of the head! Welded it and bent a washer to actively retain the tube in case the weld/bracket breaks again.
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2006 Honda Rebel Diesel
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1982 Mercedes 300D
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post #28 of 29 (permalink) Old 08-17-2019, 02:11 AM Thread Starter
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Finally figured it out. Its was the fork holder upper bolt loose....
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1989 VN750
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2006 Honda Rebel Diesel
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1982 Mercedes 300D
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post #29 of 29 (permalink) Old 08-19-2019, 08:37 PM
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Glad you found the cause of the noise. I would not try to rebuild the oem tensioners. It cannot be done. If the tensioners are bad, then the threads on the plunger and inside the aluminum tensioner body are also worn out. Either get the TOC manual tensioners, or get new oem tensioners, which you can expect to last 10-12,000 miles before they are worn out and need to be replaced again. Trying to rebuild worn out tensioners is risking destroying your engine. I have compared the internal threads between a new oem tensioner and a worn out tensioner, just out of curiosity. The threads on the worn out tensioner showed considerable wear compared to the new one Installing stronger springs will not do any good. I'm surprised the still sell those things.

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