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Old 07-01-2019, 02:48 PM   #1
twhit17
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Intake sound?

Ive watched alot of vids on youtube of vrods and alot of them have a faint whistling sound even at idle. Non turbo bikes too. What causes the whistle ?
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Old 07-01-2019, 02:55 PM   #2
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Old 07-01-2019, 04:20 PM   #3
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It's the primary gear drive connection between engine and and trans at the clutch hub area.
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Old 07-01-2019, 06:58 PM   #4
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I do not have that "whistle" on my 2007. The 2003 was quiet also.
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Old 07-02-2019, 12:38 AM   #5
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Put this on the underside of the airbag tin--- you'll be surprised how much it quiets things down....

https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1

It's very malleable, so no cutting required-- it just molds around the bumps and curves (yes, F airbox, I'm talking to you.)

I've had it on for a few years now and am very pleased.

R.
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Old 07-02-2019, 04:02 AM   #6
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So what the difference between models as far as primaries ?
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Old 07-02-2019, 07:28 AM   #7
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Quote:
Originally Posted by RustyG View Post
I do not have that "whistle" on my 2007. The 2003 was quiet also.
I know what he's talking about. Whistling isn't really the right description. There's just an underlying high pitch sound. Not really whistling or whining. Not sure how to describe it, but you can't unhear it.
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Old 07-02-2019, 08:15 AM   #8
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Reviewed the vid and it def is from the primary drive. Straight cut gears. The tighter the clearances the more it whines. My bike was a tad louder when new and I could hear it cruising originally. Only notice it at idle now. The sound tends to emanate all around bike and through the engine so hard to pin point without a stethoscope.
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Old 07-02-2019, 08:41 AM   #9
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I just watched the video too. I love the slow dramatic approach to the bike and the walk around. Really added to the anticipation, LOL.

But seriously, it sounds exactly like my stage 1 13NRS. Even your exhaust note is similar to mine. Im topless, K&N filter, Akrapovic exhaust with no baffle. Mine sounds exactly like yours. That high pitch noise is normal like Ron said. I didn't know what caused it, so I'll defer to his expertise.

I'm at the gym, so I was listening through earbuds. Means I could hear it very clearly. It seriously felt like I was sitting on my bike.
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Old 07-02-2019, 03:13 PM   #10
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I don’t know, always thought it was the timing chains sliding over the plastic chain guides in the heads, but it could be the primary gears. Someone needs to pull out the clutch and put the side cover back on and fire it up!


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Old 07-02-2019, 04:27 PM   #11
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Originally Posted by Elgavilan View Post
I don’t know, always thought it was the timing chains sliding over the plastic chain guides in the heads, but it could be the primary gears. Someone needs to pull out the clutch and put the side cover back on and fire it up!


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You first. I don't like cleaning oil off of the ceiling. LOL. On a serious note, just about all Honda twins do this and Yamahas but being a coarser cut tooth arrangement the whine is a lower pitch. V rods have very fine teeth and a higher pitch sound. As you say, some can be from the cam chains travelling over the shoes also.
Ron
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