Vibration noise ar high RPM

28452 Views 53 Replies 20 Participants Last post by mikal, Apr 30, 2016

Jkilla71

Discussion Starter · Nov 13, 2014

For about a week a was getting a noise that sounded like the fairing vibrating around the headlight every time I had gone above 8,000 rpm. It would get so loud sometimes my mind would make the noise louder than the exhaust. Well, I tightened-loosened-tightened every allen bolt and it still was making the noise. inspected around the radiator area a dozen times and no luck. However, I didn't touch the under cowl because I swear it was coming from the head light area. Yesterday a small leaf was stuck to the underside of the bike and when I pulled it off I saw the under cowl move. When I changed the oil 900 miles ago I must have not tightened the highlighted bolt in the picture because it was 2 complete turns of the wrench loose. Took the bike for a ride and no more noise. I knew there was nothing wrong with the bike the whole time because it wasn't a sound that an engine and transmission makes but it did get kind of frustrating not being able to locate what part of the fairing was loose.

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snackjack

· #17 · Feb 9, 2015

My noise is at about 5000 rpm when the throttle is held steady,not open and not closed.It too sounds like a card in a bicycle spokes.I was using Gasohol 91,changed to Gasohol 95 and no difference what so ever.If it was detonation it would occur when the engine is under strain with the throttle open.Also the 10% alcohol in the fuel will give a higher RON.

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snackjack

· #26 · Feb 9, 2015

I'm running stock exhaust,will check fuel cap tomorrow.

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snackjack

· #30 · Feb 10, 2015

The petrol cap wasn't my solution,but I have an idea for tomorrow.Big singles have a lot of vibration as you know,numb fingers after a long ride.Some parts on a bike need to be loose to work,I'm thinking clutch and brake lever,also pillion foot pegs.

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snackjack

· #34 · Feb 20, 2015

I found that I can make the clutch lever vibrate like crazy at 3200 rpm on the side stand but this is not the case on the road.The gear change pedal would make a rattle so I repacked with grease,again not the noise.

The noise sounds metallic almost like a nail is rattling in the down pipe.The stock exhaust is given a sporty sound almost like a splutter,not sure if it is this that I am hearing from the engine rather than out the back of the exhaust.

When running the engine in I was either on or off the throttle,it is only when I am in a neutral position like following cars through a village.

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snackjack

· #44 · Feb 28, 2016

Mine still sounds like a bag of nails when the throttle is in the neutral position when going through a village at car speeds.
But at 12,500 miles everything is running fine so try an ignore it but it doesn't sound nice.

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