Annoying noise at 2,5-5 k RPM

Graugaard · August 4th, 2013, 12:26 AM

Hi! i did a valve job on my bike one month ago... before the valve job, my bike had this rattle noise at 7-9k rpm... then i did the job, and all valves are now perfect, however the noise came back after 500kms, but now has the range changed so it is at 2,5-5k rpm...

could it be my CCT? i tried to reset it, and then there were no noise the first 10 kilometeres, but then it came back...

Graugaard · August 4th, 2013, 05:41 AM

And btw if it is a valve tapping, shouldn't it be there at all revs?!

Motofool · August 4th, 2013, 06:12 AM

Quote:

Originally Posted by Graugaard

.....
could it be my CCT? i tried to reset it..........:

How well did you reset it?

Graugaard · August 4th, 2013, 06:26 AM

well i took it off... pulled it all the way in with a small screwdriver, hold it there while i screwed it back on (that part was hard as ****) and then i removed the screwdriver and heard the "pop" sound, so it should have been reset.

i have heard about a tip... screwing the CCT 2 mm out, so it pops out to next level, and then screw it back in. you think i should give that a try?

Motofool · August 4th, 2013, 06:47 AM

Quote:

Originally Posted by Graugaard

..........i have heard about a tip... screwing the CCT 2 mm out, so it pops out to next level, and then screw it back in. you think i should give that a try?

By doing that, you would put excessive tension on the chain, accelerating wear.

Graugaard · August 4th, 2013, 01:56 PM

tried it now, but no change... wonder what it could be

Motofool · August 4th, 2013, 02:25 PM

Then, I would take the cover off and verify the gap for each valve.

Graugaard · August 6th, 2013, 06:45 AM

http://www.youtube.com/watch?v=YDi1i5bwv-o

recorded the sound.

Motofool · August 6th, 2013, 08:07 AM

Quote:

Originally Posted by Graugaard

..........recorded the sound.

Sorry, I don't hear well anymore.

Nothing catastrophic for sure, I would verify the valves' clearance, just to have some peace of mind.

Graugaard · August 6th, 2013, 08:35 AM

narh it runs fine too... i will take the valve cover off and check it all again, but must wait 2 days before i have the time.. :/ will use my winter gs 500 in the wait time, (if it starts -.-)

Graugaard · August 8th, 2013, 10:52 AM

Update:

Got the cover of, one ex valve was too lose. (0,32mm) i have fixed it now, but a little problem... when taking the camshaft holder off one of the 4 8mm bolts broke! so now i got half of it up and half of the 8 mm bolt is stuck (about 1 inch down in the hole...) How the HEK do i get it up! or can i live with the 3 other bolts?

Motofool · August 8th, 2013, 11:54 AM

I would find a good machine shop and take the engine (or the bike-coordinate with them before) there for a proper extraction (they have the tools and the skills).

If the bolt snapped during un-bolting, is not going to be easy for you to pull it out with just hand tools.

Graugaard · August 9th, 2013, 08:09 AM

ok so i tried to reassembly it all again got the screw fixed... and the noise is gone!!! But a new weird noise shows up :S its like the sound from a crow, actually thought it was a bird the first few times i heard it... it comes every time i give it some gas, just one at a time.. could it be wrong timing?

Motofool · August 9th, 2013, 08:24 AM

Did you verify the proper angular position of both camshafts?

Does it sound like pre-ignition?

http://en.wikipedia.org/wiki/Engine_knocking

Could it be the noise coming from the external chain?

August 4th, 2013, 12:26 AM	#1
Graugaard ninjette.org member Name: Elias Location: Denmark Join Date: Nov 2011 Motorcycle(s): Ninja 250r Posts: 152	Annoying noise at 2,5-5 k RPM Hi! i did a valve job on my bike one month ago... before the valve job, my bike had this rattle noise at 7-9k rpm... then i did the job, and all valves are now perfect, however the noise came back after 500kms, but now has the range changed so it is at 2,5-5k rpm... could it be my CCT? i tried to reset it, and then there were no noise the first 10 kilometeres, but then it came back...

August 4th, 2013, 02:25 PM	#7
Motofool Daily Ninjette rider Name: Hernan Location: Florida Join Date: Mar 2011 Motorcycle(s): 2007 Ninja 250 Posts: A lot. MOTY - 2016, MOTM - Dec '12, Jan '14, Jan '15, May '16	Then, I would take the cover off and verify the gap for each valve. __________________________________________________ *Motofool* *.................................Never ride faster than your guardian angel can fly* "Mankind is composed of two sorts of men — those who love and create, and those who hate and destroy. Love is the bond between men, the way to teach and the center of the world." - José Martí

August 8th, 2013, 11:54 AM	#12
Motofool Daily Ninjette rider Name: Hernan Location: Florida Join Date: Mar 2011 Motorcycle(s): 2007 Ninja 250 Posts: A lot. MOTY - 2016, MOTM - Dec '12, Jan '14, Jan '15, May '16	I would find a good machine shop and take the engine (or the bike-coordinate with them before) there for a proper extraction (they have the tools and the skills). If the bolt snapped during un-bolting, is not going to be easy for you to pull it out with just hand tools. __________________________________________________ *Motofool* *.................................Never ride faster than your guardian angel can fly* "Mankind is composed of two sorts of men — those who love and create, and those who hate and destroy. Love is the bond between men, the way to teach and the center of the world." - José Martí

August 9th, 2013, 08:24 AM	#14
Motofool Daily Ninjette rider Name: Hernan Location: Florida Join Date: Mar 2011 Motorcycle(s): 2007 Ninja 250 Posts: A lot. MOTY - 2016, MOTM - Dec '12, Jan '14, Jan '15, May '16	Did you verify the proper angular position of both camshafts? Does it sound like pre-ignition? http://en.wikipedia.org/wiki/Engine_knocking Could it be the noise coming from the external chain? __________________________________________________ *Motofool* *.................................Never ride faster than your guardian angel can fly* "Mankind is composed of two sorts of men — those who love and create, and those who hate and destroy. Love is the bond between men, the way to teach and the center of the world." - José Martí

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August 4th, 2013, 05:41 AM	#2
Graugaard ninjette.org member Name: Elias Location: Denmark Join Date: Nov 2011 Motorcycle(s): Ninja 250r Posts: 152	And btw if it is a valve tapping, shouldn't it be there at all revs?!

August 4th, 2013, 06:26 AM	#4
Graugaard ninjette.org member Name: Elias Location: Denmark Join Date: Nov 2011 Motorcycle(s): Ninja 250r Posts: 152	well i took it off... pulled it all the way in with a small screwdriver, hold it there while i screwed it back on (that part was hard as ****) and then i removed the screwdriver and heard the "pop" sound, so it should have been reset. i have heard about a tip... screwing the CCT 2 mm out, so it pops out to next level, and then screw it back in. you think i should give that a try?

August 4th, 2013, 01:56 PM	#6
Graugaard ninjette.org member Name: Elias Location: Denmark Join Date: Nov 2011 Motorcycle(s): Ninja 250r Posts: 152	tried it now, but no change... wonder what it could be

August 6th, 2013, 06:45 AM	#8
Graugaard ninjette.org member Name: Elias Location: Denmark Join Date: Nov 2011 Motorcycle(s): Ninja 250r Posts: 152	http://www.youtube.com/watch?v=YDi1i5bwv-o recorded the sound.

August 6th, 2013, 08:35 AM	#10
Graugaard ninjette.org member Name: Elias Location: Denmark Join Date: Nov 2011 Motorcycle(s): Ninja 250r Posts: 152	narh it runs fine too... i will take the valve cover off and check it all again, but must wait 2 days before i have the time.. :/ will use my winter gs 500 in the wait time, (if it starts -.-)

August 8th, 2013, 10:52 AM	#11
Graugaard ninjette.org member Name: Elias Location: Denmark Join Date: Nov 2011 Motorcycle(s): Ninja 250r Posts: 152	Update: Got the cover of, one ex valve was too lose. (0,32mm) i have fixed it now, but a little problem... when taking the camshaft holder off one of the 4 8mm bolts broke! so now i got half of it up and half of the 8 mm bolt is stuck (about 1 inch down in the hole...) How the HEK do i get it up! or can i live with the 3 other bolts?

August 9th, 2013, 08:09 AM	#13
Graugaard ninjette.org member Name: Elias Location: Denmark Join Date: Nov 2011 Motorcycle(s): Ninja 250r Posts: 152	ok so i tried to reassembly it all again got the screw fixed... and the noise is gone!!! But a new weird noise shows up :S its like the sound from a crow, actually thought it was a bird the first few times i heard it... it comes every time i give it some gas, just one at a time.. could it be wrong timing?