Random terrible engine noise on tape - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 76 (permalink) Old 04-25-2014, 12:02 PM Thread Starter
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Random terrible engine noise on tape

Hey guys how's it going? I sprayed the bolts for the mufflers and the Goat belly with PB blaster because I planned on changing the mufflers out. At first I thought maybe I loosened something up but after a while I didn't think that was the case anymore. I have been talking to Wolfie about this issue, I will be checking for chunks or debris in my oil. I will also be popping the stator and clutch covers to see if there is any signs of metal to metal contact. Praying for an easy fix! I say in the video that it gets worse on the sidestand but i think it was just a coincidence. Anyway here is the video here: https://www.youtube.com/watch?v=MS8aWPKjN_M

Wolfie if you see the post here, I will hopefully be able to pop those covers and check everything out today. I will try to take some real good pics to. Soon as I get it done I will share my findings.

Last edited by jcryan1988; 04-25-2014 at 12:07 PM.
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post #2 of 76 (permalink) Old 04-25-2014, 12:42 PM
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oh that's just your starter clutch I bet. Take off the starter and see if it's turning nicely by hand (the starter), then look up in there (gears you see in the engine hole) and see if anything looks funny.

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post #3 of 76 (permalink) Old 04-25-2014, 01:28 PM
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On other bikes, the starter clutch always gave me a buzzing Zebco sort of noise, but I haven't heard it on the VN.

My first impression was steel on aluminum, as in the balancer rubbing the case. A stethoscope might pinpoint it better.

Does it shake any when you rev it? This v-twin is normally quite smooth, for a v-twin.

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post #4 of 76 (permalink) Old 04-25-2014, 10:42 PM
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Ya....we talked about all but the starter....and he dumped his oil via the pan bolt instead of the side with screen...suggested he do a visual first on both side covers....thats easy....I didnt wanna get him too deep into the engine if not needed....

Its tough to diagnose noises when yer not "right there"....one soundfile, I thought it was metal on metal....in another, I thought it might be a vacuum squeak...hard to say....thats why i suggested doing a full visual first....



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post #5 of 76 (permalink) Old 04-26-2014, 05:02 AM Thread Starter
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Didn't get the chance to do anything yesterday I was way to busy. That's right I forgot to mention that to, when I did the oil change I used the wrong bolt. Hopefully after classes today I will have the chance to do the visual.
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post #6 of 76 (permalink) Old 04-26-2014, 11:34 AM
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Maybe the water pump?

I really think the $5 Harbor Fright stethoscope would help you out here.

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post #7 of 76 (permalink) Old 05-01-2014, 11:24 PM Thread Starter
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I finally got the chance to start investigating. I let the bike run for about 10 min to get the oil hot, no noises the whole time. I turned it off and went to turn it back on and the chatter was constant and it didn't start again. I drained the oil, played with the oil filter until it was completely drained, and checked the oil screen. The screen is clean, no gunky buildup but the oil had a green tint to it and smelled a little funky. Hard to explain how it smelled, it had the oil scent to it with something else. I used a white glass bowl to drain the oil into because my oil pan is to large to fit under the bike while on the side stand and after I emptied it into the oil pan it left a green stain on the bowl. Maybe it smells funky and looks a little green because there was still old oil in it? I called a friend and he said the valvoline I used may come out greenish but I figured i'd post it anyway. This bike sat for at least 3 years unstarted before I got my hands on it. I checked the coolant level thinking maybe it was antifreeze, thankfully the coolant level is fine.

Wolfie tomorrow I will be popping off the clutch and stator covers to see if I see any signs of wear, and I will take pics as well.

Spockster I think I will get one of those stethoscopes, never used one but I found online that they have a lot of uses.
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post #8 of 76 (permalink) Old 05-01-2014, 11:31 PM
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Quote:
Originally Posted by jcryan1988 View Post
I finally got the chance to start investigating. I let the bike run for about 10 min to get the oil hot, no noises the whole time. I turned it off and went to turn it back on and the chatter was constant and it didn't start again. I drained the oil, played with the oil filter until it was completely drained, and checked the oil screen. The screen is clean, no gunky buildup but the oil had a green tint to it and smelled a little funky. Hard to explain how it smelled, it had the oil scent to it with something else. I used a white glass bowl to drain the oil into because my oil pan is to large to fit under the bike while on the side stand and after I emptied it into the oil pan it left a green stain on the bowl. Maybe it smells funky and looks a little green because there was still old oil in it? I called a friend and he said the valvoline I used may come out greenish but I figured i'd post it anyway. This bike sat for at least 3 years unstarted before I got my hands on it. I checked the coolant level thinking maybe it was antifreeze, thankfully the coolant level is fine.

Wolfie tomorrow I will be popping off the clutch and stator covers to see if I see any signs of wear, and I will take pics as well.

Spockster I think I will get one of those stethoscopes, never used one but I found online that they have a lot of uses.


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post #9 of 76 (permalink) Old 05-02-2014, 09:40 AM
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Quote:
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looks a little green because there was still old oil in it? I called a friend and he said the valvoline I used may come out greenish
Yes, Valvoline Synthetic.
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post #10 of 76 (permalink) Old 05-02-2014, 11:30 AM Thread Starter
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I didn't use synthetic in this bike when I did the oil change because I read it wasn't good for our bikes. Not sure if the guy before me used it or not though.

Dirty doc I see you replied but I don't see your reply.
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