New unknown engine noise. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 11 (permalink) Old 07-09-2012, 08:11 PM Thread Starter
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New unknown engine noise.

Not sure what the heck the noise is, I checked all of the screws I could see. Just noticed it today. Not sure what to do at this point.

video.
You hear it best on the rev at the end of the video.

Also, can anyone tell me what this screw is for?
It was leaking gas, when I felt it, it was loose. I just tightened it back up, but it appears to have a locking nut, so I didn't know if it was supposed to be a little loose.

1993 Vulcan 750 "Sookie"
1980 KZ750 LTD (Project) "Saki"
2007 Honda Rebel (Sold) "Lucky"

Last edited by son-of-fire; 07-09-2012 at 08:13 PM.
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post #2 of 11 (permalink) Old 07-09-2012, 11:59 PM
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the picture is of a Manual Cam Chain Tensioner.. it is supposed to be a little loose. I can't hear videos on You-Tube for some reason, so I have no clue what the sound is.
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post #3 of 11 (permalink) Old 07-10-2012, 12:15 AM
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Quote:
Originally Posted by son-of-fire View Post
Not sure what the heck the noise is, I checked all of the screws I could see. Just noticed it today. Not sure what to do at this point.

video.
You hear it best on the rev at the end of the video.

Also, can anyone tell me what this screw is for?
It was leaking gas, when I felt it, it was loose. I just tightened it back up, but it appears to have a locking nut, so I didn't know if it was supposed to be a little loose.
That is a locking nut for the MCCT. The noise sounds a bit like chain slap - read the threads on how to adjust newly installed MCCTs (just search TOC install) and it gives you all the tips on adjusting them properly.

Looks like the PO modded the tensioners.

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Tuxedo Mod
Rebuilt Forks w/ Progressive Springs
V&H Cruzers
VN750.com Grill Cover
Meanstreak Seat
Emgo 23-92411 Handlebars
MOSFET FH012AA R/R


1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

2014 Honda VFR800F

1989 Pontiac Firebird Formula 350
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post #4 of 11 (permalink) Old 07-10-2012, 01:57 AM
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I too agree it sounds like chain slap. Sounds like your front cyclinder is a little loose.

I see you have homemade MCCT's. Possible the threads are giving up on that front cyclinder. Either reinforce with a 6mm nut inside + JB weld or go get TOC's. I ddi the mod myself and always had a nagging thought about those aluminum housings failing. Bought the TOC's and everything is good now. Except for this wierd rattle at higher RPMS. It comes from the front, but can't locate. I thought it was one of the turn signals as it has a rattle to it, but I can't hear that over the cobra's. The rattle souns similar to the noise the front brakes make with the brake applied.

Anyhoot, good luck!

I only understand what I don't understand.

Last edited by blazblu82; 07-10-2012 at 02:03 AM.
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post #5 of 11 (permalink) Old 07-10-2012, 12:11 PM Thread Starter
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Alright! thanks for the info guys. I'll start researching TOC install, see what I can figure out.

1993 Vulcan 750 "Sookie"
1980 KZ750 LTD (Project) "Saki"
2007 Honda Rebel (Sold) "Lucky"
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post #6 of 11 (permalink) Old 07-10-2012, 05:47 PM
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Another possibility is an rocker arm has fallen off of the retainer and is rattling on the top of the head, or possibly an HLA has collapsed.
The steady clicking of the noise sounds like it to me. A loose chain can make a similar noise, but I'm leaning towards the rocker.
I could be wrong, and I hope that the rocker isn't your problem. however they are fairly east to see on the front cylinder as you can take the valve cover off w/o having to pull the engine.
Please keep us posted.
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post #7 of 11 (permalink) Old 07-10-2012, 06:52 PM
..have a vulcan good day!
 
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Creative And imaginative GOOD thought TSmith68 ...Glad to have you on the forum....and Welcome.
Where do you hail from ? Any Bike pics ?
WilliamTech

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!
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post #8 of 11 (permalink) Old 07-10-2012, 08:52 PM Thread Starter
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Quote:
Originally Posted by TSmith68 View Post
Another possibility is an rocker arm has fallen off of the retainer and is rattling on the top of the head, or possibly an HLA has collapsed.
The steady clicking of the noise sounds like it to me. A loose chain can make a similar noise, but I'm leaning towards the rocker.
I could be wrong, and I hope that the rocker isn't your problem. however they are fairly east to see on the front cylinder as you can take the valve cover off w/o having to pull the engine.
Please keep us posted.
Ok, so I was just watching the rebuild videos that are stickied here. So should I try to adjust the chain first and see if the noise goes away? Or look for the rocker first? Guess I'm asking which is easier to check? Also, I should mention that I have no idea what I'm doing. I had a rebel and had rebuilt the carb, and adjusted valve clearance, but that's all the work I've done on bikes! And the Honda Rebel is a different beast by a long shot.

1993 Vulcan 750 "Sookie"
1980 KZ750 LTD (Project) "Saki"
2007 Honda Rebel (Sold) "Lucky"
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post #9 of 11 (permalink) Old 07-10-2012, 11:23 PM
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You can do the chain first. The tensioners are pretty easy to check.
There is a downloadable PDF manual on the site, and it will give full information on how to check them.
If you don't have a PDF reader, go to www.adobe.com, and download one for free.
I hail from Idaho WilliamTech, and no bike pics yet.
I live near Twin Falls about 1.5 hours East of Boise.
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post #10 of 11 (permalink) Old 07-11-2012, 11:32 AM Thread Starter
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Ok, so the more I read about those tensioners, the more I think I made the noise from my engine when I messed with it before I knew what it was. I was gonna test my theory out, but the vulcan would not turn over this morning for whatever reason. Had to walk to work. /sigh.

1993 Vulcan 750 "Sookie"
1980 KZ750 LTD (Project) "Saki"
2007 Honda Rebel (Sold) "Lucky"
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