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Numbing Vibration

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  #1  
Old 05-27-2010, 11:16 AM
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Default Numbing Vibration

I have vibration throught the whole bike (I can feel it in the foot pegs and handle bars) that is very noticeable at highway speeds. It isn't an "out of balance wheel" sort of vibration, it is more of an engine vibration, it feels like a cell phone on vibrate. After about 20 miles on the highway, my fingertips will start to go numb from the vibration in the handlebars. Could this be due to bad engine mounts or something? Thanks.
 
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  #2  
Old 05-27-2010, 11:35 AM
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All sportbikes should give a small vibe since your basically sitting on top of a engine. But not to the point that you go numb!

If your fingers are going numb just lossen your deathgrip on the bars and the numbness will away.

If its really bad and you think theres something wrong I would have someone who knows bikes check it out because its most likely causing damage it you can't stand riding it because of the vibes.

Try riding with a shorty can then you feel some vibrations to your core!
 
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  #3  
Old 05-27-2010, 11:41 AM
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I have loosened my grip and then my fingers vibrate even more. If I just touch the handle bar, my fingers start vibrating. I might go to the local bike shop and have them check it out. I didn't know if there was some common problem with the F4i or what.
 
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  #4  
Old 05-27-2010, 12:14 PM
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It could be something out of balance in the engine, but generally things don't go from in balance to out of balance without there being some pieces...

Has the bike been worked on recently? If so, it is possible that there could be a balancer out of whack (on my FJR, the brilliant techs at the shop re-indexed a balance shaft improperly, and the bike vibrated quite badly).

However, another possibility is a loose motor mount bolt. There's a sequence that has to be followed for tightening the motor mounts up, and if it isn't followed, you can end up with excess vibrations transmitted through the frame.

Finally, the primary way to tell the difference between an engine vibration and something else is if the vibration is dependent on road speed or engine speed. So, is the vibration there at idle? If you rev the bike up in neutral, does the vibration appear or increase with RPMs? If you are on the highway, does the vibration stop or change if you change gears, or just pull in the clutch and let the engine idle?

If the vibration is dependent only on your speed, it is most likely an out of balance wheel/tire, bad wheel bearing, or it could be a problem with the chain (stuck links).

Hopefully this will help you to track it down!
 
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Old 05-27-2010, 12:16 PM
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Hmmm...how is your tire pressure? If tire psi is good and tires are balanced then I would say IF it is ONLY happening on the highway or at certain rpm, something (mounts) are not balanced and/or something (bolt(s) are loose? DO you hear engine "chatter" during this vibration? Vibration ONLY on the handlebars can usually be attributed to the forks/front suspension rather than the motor...unless the entire damn frame and bike is vibrating bad enough...I say bad enough bc as stated earlier...you will have vibration by the mere fact that its a motorcycle!!!! Adjust forks/front suspension maybe?
 
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Old 05-27-2010, 03:38 PM
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Thanks for the suggestions guys. I will try those few things on my way home from work. I do understand there will be vibrations with the motorcycle, but as said, it is bad enough to make my fingers go numb. Also, I do feel the vibration in the seat and the foot pegs and the handle bars.
 
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  #7  
Old 05-27-2010, 04:16 PM
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check all your engine,frame,tank and all your mounting points..i had a loose engine frame bolt once that was unbelievable bad until i changed it..bolt threads were stripped
 
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  #8  
Old 05-27-2010, 11:43 PM
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It is definitely an engine vibration. It starts at around 7000 rpms. I pulled the clutch while going down the highway and the vibration was still there. I will check all the bolts.
 
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  #9  
Old 05-28-2010, 09:15 AM
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Originally Posted by Z Freak View Post
It is definitely an engine vibration. It starts at around 7000 rpms. I pulled the clutch while going down the highway and the vibration was still there. I will check all the bolts.
Perhaps we've still got some confusion. If the vibration is from the engine, it will change with engine RPM, so if you are doing 7000 rpm and you pull in the clutch, the vibration should drop off as the RPMs drop. If the vibration stays the same, it is probably from something else (chain, wheels, etc).
 
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  #10  
Old 05-28-2010, 12:56 PM
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It does change with rpm's. It gets worst until about 9500 rpms, and then vibrates less after 9500 rpms until redline.
 
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