SuzukiSavage.com - S40 deceleration noise

Wr112

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S40 deceleration noise
05/23/23 at 03:06:38

I have a 2009 Boulevard and S40 that I’ve owned since purchasing new and starting just this spring there is now a concerning noise on deceleration. It’s most noticeable in second and third gear when you let off the throttle, there is a loud, humming/whining noise. The noise immediately goes away if you get back on the throttle or pull in the clutch and coast so it doesn’t appear to be anything related with bearings or brakes. They’re also doesn’t appear to be any effect on function at least for the moment; the bike performs as expected and there’s no grinding or clunking noises it’s just a weird abnormal whining humming that is loud enough that it can be heard from a person on another bike riding with me. This is the first time in all of the years of owning it that I’ve run into an issue. The only other thing we’ve ever done to it is install the modified cam chain tensioner preemptively last year at 15,000 miles. I took a short video clip of the bike making the noise while decelerating but I’m not sure if it’s possible to post that in here. Any suggestions would be greatly appreciated. Thank you

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DragBikeMike Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 4471 Honolulu	Re: S40 deceleration noise Reply #1 - 05/23/23 at 03:34:37 Try this. Works like a champ. Contact Armen or Fast650 for the spacer. http://suzukisavage.com/cgi-bin/YaBB.pl?num=1561964431 Good luck
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ohiomoto Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 2825	Re: S40 deceleration noise Reply #2 - 05/24/23 at 18:59:39 If it sounds like a whining noise coming from the lower end, my bike makes the same noise. My bike has done it since I've owned it and I've probably put 25-30k miles on it since I bought it. I'm not concerned. I believe Dave mentioned his bike makes the same noise.
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LANCER

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Re: S40 deceleration noise
Reply #3 - 05/25/23 at 04:33:16

A side note, are you using Rotella T4 or 6 ?
If not, it would be good to use for overall engine life. My reason for including this here is that when I began using oil with ZDDP in it I noticed a reduction in engine noise and when changing gears the clunking ceased over a very short period of time and became smooth. I had the bike for years at this point, it was not a normal break-in for a new bike. I had ordered a 6 pack of ZDDP to mix with an oil of choice. I mixed a slightly heavy ratio for my bike and by 2-3 tanks shifting became smoother as well.
Just a thought, it might be a little helpful.

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Wr112

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Re: S40 deceleration noise
Reply #4 - 05/25/23 at 05:16:17

Thanks for the recommendations. I was a little surprised and thankful at what ended up being solution. When I was reading one of the threads regarding the rear hub issue I saw a couple people talking about the drive belt rubbing on the pulley walls causing strange noises. I was initially dismissive of that being my issue because when I pulled in the clutch the noise would go away and it seemed to me the noise would still be present with the clutch in and coasting if it was a bearing or belt problem but figured it was quick and cheap to apply a little grease to the sides of the belt for a quick test. Just a little bit of grease on the edges of the drive belt and noise is gone….still don’t understand why I wasn’t getting the noise while coasting and only heard it while decelerating with the clutch out but I’m happy it was easily located. Moving forward I will need to see what is recommended to apply to the belt, this is the only belt drive machine I have owned and it just now has started causing the noise so to date I have never put anything on the belt before. Thanks for the quick replies.

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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: S40 deceleration noise Reply #5 - 05/25/23 at 08:38:10 I've used ivory soap to stop belt squeak, but it makes a mess, There are dry lube sprays out there. I doubt grease on the belt is a great idea. Stabilizing the pulley, once you have determined that is the problem, sounds like The solution.
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Ruttly Serious Thumper Offline Thumpers Rule Posts: 5401 Manteca , CA Gender:	Re: S40 deceleration noise Reply #6 - 05/26/23 at 10:18:53 DBM has got the best repair for the pulley/sprocket hub. Relatively cheap with great results , a must do. Do it and then forget about it. two cent
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Hiko Senior Member Offline SuzukiSavage.com Rocks! Posts: 250 Tauranga New Zealand Gender:	Re: S40 deceleration noise Reply #7 - 05/27/23 at 18:56:50 The pulley wobble fix that DGM came up with is a no brainer Give a medal to that man The belt will not track right if the pulley is wobbling from load to no load positions all the time. Before I did this I used a little beeswax on the sides of the belt to stop the chirping noise but the duplex bearing on the rear fixed everything
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Wr112 YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 11	Re: S40 deceleration noise Reply #8 - 05/28/23 at 01:10:24 I still struggle a bit navigating the site to find specific things. Does someone on here sell the better bearing and modified wheel spacers? If so, how do I get to that page to be able to order those parts. Thanks
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Ruttly Serious Thumper Offline Thumpers Rule Posts: 5401 Manteca , CA Gender:	Re: S40 deceleration noise Reply #9 - 05/28/23 at 07:30:44 The bearing you can source thru eBay or Amazon. I believe Armen sells the spacer. Try looking in the Marketplace.
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Ruttly Serious Thumper Offline Thumpers Rule Posts: 5401 Manteca , CA Gender:	Re: S40 deceleration noise Reply #10 - 05/28/23 at 07:32:30 Do 5 more posts then send a pm to Armen.
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: S40 deceleration noise Reply #11 - 05/28/23 at 10:15:59 1
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: S40 deceleration noise Reply #12 - 05/28/23 at 10:16:27 2 Like that
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Wr112 YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 11	Re: S40 deceleration noise Reply #13 - 05/28/23 at 10:51:53 Alright…..thanks. I wasn’t sure if I was going to need to just start making up issues to post about to raise my post count. Lol
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: S40 deceleration noise Reply #14 - 05/28/23 at 19:31:43 Naah, no need to get everyone trying to solve bogus problems.
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