Strange Noise at ~6000 RPM

forevertwowheels · June 21st, 2011, 08:24 AM

When i decelerate, with the throttle fully closed, the bike makes a weird sound at 6500 till 6000 rpms. I've tried it in different gears and it still happends everytime i pass through 6500. I get below it and then blip the throttle above it and it will still do it on the way past. i never noticed this before, only since installing K&N R-0990 and dynojet kit. it only happens for that slit second and it sorta sounds like metal grinding but its hard to tell its so short. anyone else have this or know what its from?
thanks

DaBlue1 · June 21st, 2011, 09:36 AM

When you removed the airbox, added the pods, the extra fuel and air, you changed the way the engine resonates. The air that is now going in to the intake is turbulent air and turbulent air makes noise. That split second of change in sound is the engine having fuel shut off from cutting the throttle.

Did you remove the kleen air system or change exhaust?

leed · June 21st, 2011, 05:17 PM

Check your fairings/windscreen or your instrument cluster for vibrations. I had this issue (stock bike, though) as well. For me, it was the tips of the windscreen vibrating against the tips of the fairing that run over it. A little bit of foam-tape (left one side covered with paper) along the edge solved the problem for me.. Though now that I recently disassembled the fairings and reassembled, I seem to have developed another one elsewhere. Also check for loose screws!

kkim · June 21st, 2011, 06:18 PM

Quote:

Originally Posted by forevertwowheels

When i decelerate, with the throttle fully closed, the bike makes a weird sound at 6500 till 6000 rpms. I've tried it in different gears and it still happends everytime i pass through 6500. I get below it and then blip the throttle above it and it will still do it on the way past. i never noticed this before, only since installing K&N R-0990 and dynojet kit. it only happens for that slit second and it sorta sounds like metal grinding but its hard to tell its so short. anyone else have this or know what its from?
thanks

does it do it when the bike is in neutral?

forevertwowheels · June 23rd, 2011, 08:35 AM

Quote:

does it do it when the bike is in neutral?

yes it still does. i just tested it sitting in the garage. while i was sitting on it i brought it over 8000 and let it drop, aside from the regular vibrations the bike makes when its running, when it passes over 6500-6000 rpms i can feel a different viberation in the seat.

Quote:

When you removed the airbox, added the pods, the extra fuel and air, you changed the way the engine resonates. The air that is now going in to the intake is turbulent air and turbulent air makes noise. That split second of change in sound is the engine having fuel shut off from cutting the throttle.

Did you remove the kleen air system or change exhaust?

i dont think it would be that becuase i was closing the throttle up at 12000 and it only happens at 6500-6000.
yes i removed the kleen air system and changed to a Area P 18" CF Race System.

Quote:

sounds like chain noise.

don't think its the chain, does it while not moving.

kkim · June 23rd, 2011, 12:41 PM

make sure it's not your clutch lever making noise/vibrating. hold onto it while the bike revs back down and see if that stops the metal grinding noise.

setasai · June 23rd, 2011, 03:06 PM

What about engine mounting bolts? If it's loose, it might chatter when the engine vibrates. Mine's tight but the vibrations occur at 8k rpms. If it is loose, i'd imagine the vibrations would be felt at lower rpms and could, for lack of a better word, bounce around. With that same thought, i'd check the other bolts as well just in case.

forevertwowheels · June 24th, 2011, 08:46 PM

i checked the clutch lever yesterday and it was still making that noise. i checked again today without holding the clutch lever still and the noise was gone. i thought i was going crazy untill i was taking the fairings off and i noticed this... i wonder if this was the cause of the noise. its interesting that i only heard/felt it at ~6000.

kkim · June 24th, 2011, 09:08 PM

the engine has a natural harmonic at about 6K. anything loose that can/will rattle will be most noticeable at that RPM.

setasai · June 24th, 2011, 11:29 PM

Quote:

Originally Posted by forevertwowheels

i checked the clutch lever yesterday and it was still making that noise. i checked again today without holding the clutch lever still and the noise was gone. i thought i was going crazy untill i was taking the fairings off and i noticed this... i wonder if this was the cause of the noise. its interesting that i only heard/felt it at ~6000.

Was there no bolt there? Also kinda looks like the top half of the plastic was cut off. I'm assuming since you didnt point it out that you removed the plastic tabs before taking the picture because there should be something in that hole on the right of the bolt you circled. Like kkim says... there's a resonance at 6kish... mine tends to happen at 8k but in anycase, loose things are baddddd.

nah.uhh · June 25th, 2011, 01:57 AM

Quote:

Originally Posted by forevertwowheels

i checked the clutch lever yesterday and it was still making that noise. i checked again today without holding the clutch lever still and the noise was gone. i thought i was going crazy untill i was taking the fairings off and i noticed this... i wonder if this was the cause of the noise. its interesting that i only heard/felt it at ~6000.

I posted this in a couple other threads, I had the same problem aswell..
Yes there should be a bolt there and yes the sound your hearing if from the rad vibrating. Ofcourse you could also have more things loose than that and have more vibrations, so check all the bolts, your toolkit shoild be enough.. And yes you should periodically check to make sure screws and bolts are tight especially when you start hearing vibrations/buzzing.. They (random bolts, certain ones are a lot more common) will vibrate loose at some point

hirubhaiambani · July 21st, 2012, 01:25 PM

Thank goodness I found this thread.

I was cruising at around 70-75mph @ ~7-8k rpm and I noticed a metallic vibrating sound

. First thought: Bike is falling apart, Holy Sheet....lol

The fact that I could hear the metallic vibration clatter in my obnoxiously loud helmet was nerve wracking.

I will check all the suggestions mentioned in this thread and hopefully nail the noise culprit.

alex.s · July 21st, 2012, 01:26 PM

wear some ear plugs

scottg · July 22nd, 2012, 07:42 PM

Quote:

Originally Posted by hirubhaiambani

Thank goodness I found this thread.

I was cruising at around 70-75mph @ ~7-8k rpm and I noticed a metallic vibrating sound

. First thought: Bike is falling apart, Holy Sheet....lol

The fact that I could hear the metallic vibration clatter in my obnoxiously loud helmet was nerve wracking.

I will check all the suggestions mentioned in this thread and hopefully nail the noise culprit.

So I'm kinda nearing the break in period on my bike (+/- 600 mi) now and brought it up to about 9k for the 1st time today and heard the same metallic sound right around 9k. Does anyone know if this is normal?

choneofakind · July 23rd, 2012, 07:51 AM

Are your keys buzzing on the triple? That always makes a vibrating noise for me when I'm up in the rpm's
Posted via Mobile Device

hirubhaiambani · July 23rd, 2012, 09:41 AM

Quote:

Originally Posted by choneofakind

Are your keys buzzing on the triple? That always makes a vibrating noise for me when I'm up in the rpm's
Posted via Mobile Device

Hmm…I should watch out for that...

scottg · July 23rd, 2012, 03:20 PM

Quote:

Originally Posted by choneofakind

Are your keys buzzing on the triple? That always makes a vibrating noise for me when I'm up in the rpm's
Posted via Mobile Device

Good thought, I'm gonna check that out

Darkspy72 · August 7th, 2012, 11:39 AM

I'm having this exact problem. I posted about it in another thread. No answers yet but I am starting to believe its a resonance thing. My bike is all stock. I have the added variable that it's been happening on the morning commute when its cold (65 degrees) and not on the return when its hot (90 degrees). Could expansion / contraction play a big enough roll to cause a noise at certain temps and not at others? Thanks

Samer · August 19th, 2012, 02:47 PM

+1 on resonance. My bike has a 'buzz' at 6000 RPM which is definitely a resonance thing. Back when I first got the bike and took it to the dealer for the 600 service, I mentioned the issue and they said also that that is just the way it is. Kind of annoying because I go through 6000 RPM often in city driving and it is noticeable.

csmith12 · August 19th, 2012, 07:03 PM

word!

Darkspy72 · August 20th, 2012, 06:15 AM

Agreed. Mine turned out to be resonance as well. Once I took my helmet off and got my head down beside the bike instead of overtop the sound completely changed and it became obvious what it was. Not sure exactly where it's coming from, I'm just glad it's nothing serious. It can be annoying with all my city driving though.

June 21st, 2011, 08:24 AM	#1
forevertwowheels ninjette.org member Name: TKO Location: Winnipeg, MB Join Date: Jan 2011 Motorcycle(s): 2010 Kawasaki Ninja 250R 2011 Honda CBR600RR Posts: 50	Strange Noise at ~6000 RPM When i decelerate, with the throttle fully closed, the bike makes a weird sound at 6500 till 6000 rpms. I've tried it in different gears and it still happends everytime i pass through 6500. I get below it and then blip the throttle above it and it will still do it on the way past. i never noticed this before, only since installing K&N R-0990 and dynojet kit. it only happens for that slit second and it sorta sounds like metal grinding but its hard to tell its so short. anyone else have this or know what its from? thanks __________________________________________________ Projekt D Fender Eliminater / DMP Integrated Taillight / Proton Flushmounts / Area P 18" CF High Mount Race System / Kleen Air System Removed / Airbox Removed / K&N R-0990 / DynoJet Jet Kit

July 21st, 2012, 01:25 PM	#12
hirubhaiambani Ninjette Fanboy Name: HB Location: Missouri Join Date: Jun 2012 Motorcycle(s): 2008 Ninja250 Posts: 307	Thank goodness I found this thread. I was cruising at around 70-75mph @ ~7-8k rpm and I noticed a metallic vibrating sound. First thought: Bike is falling apart, Holy Sheet....lol The fact that I could hear the metallic vibration clatter in my obnoxiously loud helmet was nerve wracking. I will check all the suggestions mentioned in this thread and hopefully nail the noise culprit.

July 21st, 2012, 01:26 PM	#13
alex.s wat Name: wat Location: tustin/long beach Join Date: Sep 2009 Motorcycle(s): wat Posts: Too much. Blog Entries: 5 MOTM - Oct '12, Feb '14	wear some ear plugs __________________________________________________

August 19th, 2012, 07:03 PM	#20
csmith12 The Corner Whisperer Name: Chris (aka Reactor) Location: Northern KY Join Date: May 2011 Motorcycle(s): 2010 250 (track), 1992 250, 2006 R6 (street/track), 2008 R6 (track) Posts: Too much. MOTY 2015, MOTM - Nov '12, Nov '13	word! __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School

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June 21st, 2011, 09:36 AM	#2
DaBlue1 Long Time Rider Name: Blue Location: Charlotte, NC Join Date: Sep 2010 Motorcycle(s): 2009 Kawasaki Ninja 250R Posts: A lot.	When you removed the airbox, added the pods, the extra fuel and air, you changed the way the engine resonates. The air that is now going in to the intake is turbulent air and turbulent air makes noise. That split second of change in sound is the engine having fuel shut off from cutting the throttle. Did you remove the kleen air system or change exhaust?

June 21st, 2011, 05:17 PM	#3
leed ninjette.org sage Name: David Location: Loves Park, IL Join Date: Feb 2011 Motorcycle(s): Time will tell Posts: 969	Check your fairings/windscreen or your instrument cluster for vibrations. I had this issue (stock bike, though) as well. For me, it was the tips of the windscreen vibrating against the tips of the fairing that run over it. A little bit of foam-tape (left one side covered with paper) along the edge solved the problem for me.. Though now that I recently disassembled the fairings and reassembled, I seem to have developed another one elsewhere. Also check for loose screws!

June 23rd, 2011, 12:41 PM	#6
kkim Join Date: Nov 2008 Posts: Too much.	make sure it's not your clutch lever making noise/vibrating. hold onto it while the bike revs back down and see if that stops the metal grinding noise.

June 23rd, 2011, 03:06 PM	#7
setasai ninjette.org certified postwhore Name: Brian Location: Detroit, MI Join Date: Jun 2010 Motorcycle(s): 2009 Ninja 250R Green Posts: A lot.	What about engine mounting bolts? If it's loose, it might chatter when the engine vibrates. Mine's tight but the vibrations occur at 8k rpms. If it is loose, i'd imagine the vibrations would be felt at lower rpms and could, for lack of a better word, bounce around. With that same thought, i'd check the other bolts as well just in case.

June 24th, 2011, 09:08 PM	#9
kkim Join Date: Nov 2008 Posts: Too much.	the engine has a natural harmonic at about 6K. anything loose that can/will rattle will be most noticeable at that RPM.

July 23rd, 2012, 07:51 AM	#15
choneofakind ninjette.org certified postwhore Name: . Location: . Join Date: Feb 2011 Motorcycle(s): . Posts: Too much. MOTM - Feb '13, Feb '14	Are your keys buzzing on the triple? That always makes a vibrating noise for me when I'm up in the rpm's Posted via Mobile Device

August 7th, 2012, 11:39 AM	#18
Darkspy72 ninjette.org member Name: Jordan Location: Indianapolis Join Date: Aug 2012 Motorcycle(s): Ninja 250r 2012 Posts: 37	I'm having this exact problem. I posted about it in another thread. No answers yet but I am starting to believe its a resonance thing. My bike is all stock. I have the added variable that it's been happening on the morning commute when its cold (65 degrees) and not on the return when its hot (90 degrees). Could expansion / contraction play a big enough roll to cause a noise at certain temps and not at others? Thanks

August 19th, 2012, 02:47 PM	#19
Samer ninjette.org guru Name: Samer Location: Jupiter, Florida Join Date: Sep 2009 Motorcycle(s): 09 Ninja 250R SE Posts: 376	+1 on resonance. My bike has a 'buzz' at 6000 RPM which is definitely a resonance thing. Back when I first got the bike and took it to the dealer for the 600 service, I mentioned the issue and they said also that that is just the way it is. Kind of annoying because I go through 6000 RPM often in city driving and it is noticeable.

August 20th, 2012, 06:15 AM	#21
Darkspy72 ninjette.org member Name: Jordan Location: Indianapolis Join Date: Aug 2012 Motorcycle(s): Ninja 250r 2012 Posts: 37	Agreed. Mine turned out to be resonance as well. Once I took my helmet off and got my head down beside the bike instead of overtop the sound completely changed and it became obvious what it was. Not sure exactly where it's coming from, I'm just glad it's nothing serious. It can be annoying with all my city driving though.