April 10th, 2014, 07:05 PM | #1 |
ran when parked
Name: Katie
Location: DC/MD
Join Date: Aug 2013 Motorcycle(s): Freeride 250R, KLX250SF, mopeds Posts: A lot.
MOTM - Sep '17, Dec '14
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Rasping Noise Above 8k RPM
My bike makes a rasping noise when I am riding above 8,000 RPM. It sounds like a very light scratching, like a piece of paper edge scratching on something, or a vibration of metal on metal... At first I thought it was my keys vibrating against the triple tree but then I held the keys while I rode. It ONLY happens after the bike passes the 8,000 RPM mark, and it doesn't happen 100% of the time, nor is it a steady/consistent sound. The bike is perfectly happy to rev to the redline and it performs normally above 8k rpm, but the noise is a bit disconcerting. It sounds like it's coming from in front of me/below me. As soon as I shift up or slow down, or in any other way drop the RPM to below 8000, the noise immediately stops.
Anyone have any idea what this is? Someone said I should re-jet after installing the two brothers exhaust, but it made this noise ever since I got it. It had the valves adjusted 1500 miles ago and the shop guy who did it didn't mention anything else out of place or needing adjustment. Any leads would be appreciated! |
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April 10th, 2014, 07:16 PM | #2 |
Ninjette Jockey
Name: Tim
Location: Stockton, Ca
Join Date: Oct 2010 Motorcycle(s): Ninja 250R, Harley Davidson Heritage Softail, 2 Honda Monkeys, Polini & GRC mini GP Posts: A lot.
Blog Entries: 3
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Could be a sympathetic/resonant vibration, as you suspect. I had a similar case that turned out to be a baffle in the muffler that had come adrift. Look for the usual suspects: heat shields, horn bracket, ect. When the bike is cold, feel and tap things to see if anything seems loose.
Sometimes annoying noises are nothing important. Like the song says, "don't let the sound of your own wheels make you crazy...".
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For what shall it profit a man, if he shall gain the whole world, and lose his own soul?. |
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April 10th, 2014, 07:26 PM | #3 |
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
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Slightly pull the clutch lever when that happens, just in case it may be.
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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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April 10th, 2014, 07:28 PM | #5 |
ran when parked
Name: Katie
Location: DC/MD
Join Date: Aug 2013 Motorcycle(s): Freeride 250R, KLX250SF, mopeds Posts: A lot.
MOTM - Sep '17, Dec '14
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^I will check this out tomorrow and report back.
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April 10th, 2014, 07:58 PM | #6 |
Private Joker
Name: Ben
Location: Towson, MD
Join Date: Nov 2012 Motorcycle(s): '99/'01 Ninja 250 "sketchy", '13 Ninja 300 "yoshi", '03 GSXR 600 "merlin" Posts: A lot.
MOTM - Mar '14
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are the bolts on the headers tightened all the way? if they're loose they can vibrate a bit and that's the right general location of the sound.
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April 10th, 2014, 08:05 PM | #7 |
ran when parked
Name: Katie
Location: DC/MD
Join Date: Aug 2013 Motorcycle(s): Freeride 250R, KLX250SF, mopeds Posts: A lot.
MOTM - Sep '17, Dec '14
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Good point, I should check those anyway since I took the headers off this winter to sand/paint them.
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April 11th, 2014, 10:37 AM | #8 |
ran when parked
Name: Katie
Location: DC/MD
Join Date: Aug 2013 Motorcycle(s): Freeride 250R, KLX250SF, mopeds Posts: A lot.
MOTM - Sep '17, Dec '14
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It's the clutch lever!!!
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1 out of 1 members found this post helpful. |
April 11th, 2014, 11:04 AM | #9 |
ninjette.org member
Name: Ish
Location: San Clemente, California
Join Date: Nov 2013 Motorcycle(s): Ninja 250 2001 KX125 2001 Posts: 85
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Good to hear you found the problem.
I changed motors on my bike and have been hearing that similar noise right at 8,000 through 9,000 rpm I'll triple check everything too!! Hopefully it’s just the clutch lever because I thought it was my valve spec so I checked and adjusted (which I did and those suckers were tight) but the noise is still there. Guess these motors vibrate the most at 8,000 RPM |
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April 11th, 2014, 11:08 AM | #10 |
ran when parked
Name: Katie
Location: DC/MD
Join Date: Aug 2013 Motorcycle(s): Freeride 250R, KLX250SF, mopeds Posts: A lot.
MOTM - Sep '17, Dec '14
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Yeah, it's really weird that it completely stops at EXACTLY 8,000 rpm.
Good luck!! |
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April 11th, 2014, 01:22 PM | #11 |
ninjette.org member
Name: Ish
Location: San Clemente, California
Join Date: Nov 2013 Motorcycle(s): Ninja 250 2001 KX125 2001 Posts: 85
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