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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Louder Noise - SOLVED /cgi-bin/YaBB.pl?num=1258232616 Message started by Ebikerman on 11/14/09 at 13:03:36 |
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Title: Louder Noise - SOLVED Post by Ebikerman on 11/14/09 at 13:03:36 I have a very bothersome noise coming from my '06 S40. I will try to explain best as I can. It is a very hard noise to describe......Must be in 2nd gear or higher, clutch must be engaged and you must be accelerating or have some restance. Pull clutch in and noise stops immediately. Rev engine with clutch pulled in while rolling and no noise. It also stops on deceleration. I have heard this sound (extremely low) with the bike sitting still in neutral and idleing. I could hear this sound from behind and the right side of the bike. Sound is much like something intermitantly touching inside of clutch cover or in muffler, but it is loud enough to hear real easily without a windshield and with helmet on and doing 55mph. Not a knock or a scrape. Maybe a rattle. I know this is a poor description of the actual sound. It is bothersome and I am afraid something is coming loose even though the bike runs fine. I have thought it was a spark knock, but have tried 93 octane and running with the choke on.....No difference. It is very loud today, more so than usual. Any ideas would be appreciated....Dan |
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Title: Re: Louder Noise Post by RidgeRunner13 on 11/14/09 at 13:27:23 Check to see if the front of your belt guard is vibrating against the inside of the front sprocket cover. There is supposed to be a little pad on your belt guard where it fits behind the front cover but they fall off. I bent my belt guard for a little more cleearance & haven't had the noise since. Drove me crazy trying to figure it out because it only did it under hard acceleration in 2nd gear. 8-) |
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Title: Re: Louder Noise Post by Serowbot on 11/14/09 at 13:40:08 Just to rule it out,... put pressure, downward, upward, sideward... on the speedo while hearing the noise... |
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Title: Re: Louder Noise Post by verslagen1 on 11/14/09 at 14:25:10 put your hand on various parts of the bike while you hear the noise to see if it goes away. headlight speedo are likely culprets. |
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Title: Re: Louder Noise Post by Ebikerman on 11/15/09 at 12:57:54 Noise is much less today, as has been the case before, but it is still there. I got on my knees beside the bike and listened carefully. At first I thought it was coming from the exhaust, but not true, I covered the exhaust outlet with my gloves and the sound did not change. As I moved up the muffler with my ear, the sound continued, but dissapeared somewhere short of the front of the muffler. A better explanation of the sound is something like you would make with your mouth if you were trying to simulate a steamboat fog horn. When riding, add to that something like a mild clap on acceleration. I am just about to believe it could be a deteriorating bearing having to do with the clutch or trans, Maybe it is just a normal sound for these bikes. Whatever it is, I don't like it. As far as the speedo, I tried pushing it every which way to no avail. I also took off the side cover to the front sprocket and rode the bike without it. Same sound today with the cover on or off. Thanks guys for that info, but it is something else. Thanks, Dan |
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Title: Re: Louder Noise Post by Ed L. on 11/15/09 at 13:17:07 Check the torque on big the nut that holds the front drive hub on. They can get loose and cause strange noises along with spline wear. |
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Title: Re: Louder Noise Post by justin_o_guy2 on 11/15/09 at 14:12:27 Take a long screwdriver & put the handle against the bone in front of your ear. Use that like a stethoscope. |
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Title: Re: Louder Noise Post by RidgeRunner13 on 11/15/09 at 14:20:25 Maybe you have something coming loose inside the muffler- cracked baffle? Using a long screwdriver, you can place the tip where you want to listen & put your ear to the handle. You will be able to move it until you locate where it is the loudest. Just be EXTREMELY CAREFUL near moving parts. Or, make a trip to Harbor Freight & pick up a mechanics' stethoscope for $5.99. http://www.harborfreight.com/cpi/photos/41900-41999/41966.gif 8-) |
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Title: Re: Louder Noise Post by Ebikerman on 11/15/09 at 15:17:56 24053E2D4F610 wrote:
I will try your idea of checking the torque. How do you hold the pulley still while you torque the nut? Thanks, Dan |
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Title: Re: Louder Noise Post by Ebikerman on 11/15/09 at 15:20:00 The screw driver idea is a good one too. I can do this while sitting still, but can't while riding. Thanks for a good idea. I may order me a mechanics sthescope from Harbor Freight since there is not one in my town. Thanks, Dan |
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Title: Re: Louder Noise Post by Ebikerman on 11/15/09 at 15:36:12 Strange as it may seem, I am beginning to think this sound may be something like detonation or spark knock. When I first got this bike, I had my mechanic friend do the white washer mod since it was running very lean and surging unacceptably. He ground off about half of the spacer. Surging is hardly noticible now and fuel mileage is around 57mpg. The bike runs strong. The strange thing is that when it was so lean, the spark plug was sooty. The idle screw was out about 2 1/2 turns. Can you explain that? I have not checked the plug since the modification. During warmer weather, I had the idle mixture screw set at 1 1/2 turns out and all was fine except for that same old noise I have been complaining about. As colder weather moves in, I am getting more backfires even with more turns out on the screw. Still runs good though. I believe the previous owner upped the main jet to a 155. Not sure what is standard for an '06 S40, but a 155 is what is in there now. Oh, by the way, I even checked the airfilter to see if it was rattling. I sure appreciate everyones help. Please don't stop now. Thanks, Dan |
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Title: Re: Louder Noise Post by jabman on 11/15/09 at 23:30:54 if the jets dont make sense then 1 float level is out 2 there not genuine mikuni jets 3 they are for the wrong carb |
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Title: Re: Louder Noise Post by Routy on 11/16/09 at 05:35:21 I have a very hard deep knocking type of noise on WOT only, but only thru the intermedieate RPM range. Mite be spark knock,...I wouldn't know, but it doesn't concern me much if at all, because anymore, WOT is not my most favorite throttle position for more than a few seconds ! :o And seems like I had about the same noise on a 750 Norton Atlas years ago. The noise never changed. |
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Title: Re: Louder Noise Post by Ebikerman on 11/16/09 at 06:20:06 I called the main jet a 55 when it should be identified as a 155. Sorry about that................Dan |
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Title: Re: Louder Noise Post by Rocco on 11/18/09 at 22:16:15 i heard the same noise i think for the first time 2nite, i remember my friend saying detonation sounds like a death rattle or knock, mine was coming from the front of the engine..... this is drivin me nuts as i'm not sure if it always has done it and i'm just now hearing it OR something is going wrong....but she runs fine...even 2 up!! |
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Title: Re: Louder Noise Post by verslagen1 on 11/18/09 at 22:35:28 There are several things to check and I'd do them in order of ease. Loose parts... speedo, headlight and other various parts. Torque motor mounts, all of them. pulley cover and belt covers. adjust valves check your ankles, press 'em against the covers, vibes should be equal. For those of you w/o verslavies, this will save your @$$ if you pay attention. If all of this doesn't yield a non rattling bike... I'd whip out the stethascope and put it to good use. Any knocking around the oil filter and I'd have the cover off before you ride again. |
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Title: Re: Louder Noise - SOLVED Post by Ebikerman on 12/24/09 at 06:06:23 NOISE FOUND & FIXED......When we put Verslagen1's cam chain tensioner (the one with two holes) on, it allowed for more tension on the chain. The noise stopped. My OEM tensioner was only about half way out, but it did not put enough tension on the cam chain to cause it to run quietly. My mechanic said it was too loose. I hope his using the farther out hole does not put too much tension on the chain. |
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Title: Re: Louder Noise Post by justin_o_guy2 on 12/24/09 at 06:48:39 I think theres some work to be done in the cam chain/tensioner area that would benefit all. The chains go away too fast. Some folks get decent wear, others less. The variables make it hard to see the problem. No one here runs the bike too long w/o an oil change, tho. & seems everyone is trying to use a quality oil, so, unless the engines have different oiling systems ( some variations in pressure/flow/distribution) that would account for some chains not lasting as long, then my best guess on why it is that way is that the tensioner gets a "click" & then the jug grows from heat & stretches the chain hard against the pins, then that wears them. So, Im toying w/ the idea of eliminating some of the teeth on the adjuster. |
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Title: Re: Louder Noise Post by Ebikerman on 12/24/09 at 07:26:08 Justin_O_guy, You may have hit on something. However, my chain was too loose even though the tensioner plunger was only half way out. (4600 mi.) There is also side to side play of the chain because the tensioner is not mounted in such a way as to prevent this. In my case the spring seemed to be too weak to hold the proper tension against the cam chain. If there is a flaw in your idea it might be that reguardless of the closeness of the rachet teeth, once the click happened you would have the same condition as before. With less teeth you would have longer periods of declining tension, but as soon as the click happened the tightness condition would be similar to the original. I think the tensioner Verslagen1 has made is great. We might add some guide to prevent lateral movement. If the chain is being oiled properly, the tension on the slack side would hardly compare with the tension on the pulling side. Therefore, I think the extra tension you mention would hardly be noticed in chain wear. It might result in extra wear of the surface of the tension parts that rub on the chain. Just my opinion....Dan. |
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Title: Re: Louder Noise Post by justin_o_guy2 on 12/24/09 at 07:41:43 I think the tensioner Verslagen1 has made is great. You talking about the one with the plates or the welded on tab? I think theyre both good, tho I need to study the plates again & see how that works. I forgot. Im not sure how my idea would work out, either. I wouldnt want to try it unless I had another tensioner arm with all its "teeth" intact. If it did work out, Id sure want to weld a tab on it & get more wear outta that chanin. |
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Title: Re: Louder Noise Post by Ebikerman on 12/24/09 at 11:12:37 I have the one with the weld on tab....Dan |
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