Whassup with this new vibe? - Wrist Twisters
 
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post #1 of 10 Old 11-02-2008, 07:25 PM Thread Starter
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Whassup with this new vibe?

Recently I noticed an unusual vibration while riding the 919. Not sure exactly how to describe it but I suspect a problem. It's only noticeable between 40-60mph when cruising. When in accel or decel going thru this range everything feels normal. But when cruising down local streets at a fairly constant pace it really stands out. Thing is - it's not a sound, more like a new vibration in the mix.

The best way to describe it is a rythmic "VRRT-VRRT-VRRT" that feels very solid.

Bike has approx. 14000mi on it. Stock chain and sprockets. I now know the rear axle adjusters are "less than reliable" for proper alignment.

Been on a mission lately to get precise chain alignment with measurements using a clear millimeter ruler between the center of the rear axle and end of the swingarm so I've re-adjusted the chain twice within the last 1000mi When the bike is on the rear stand, everything seems to spin freely with minimal brake drag.

I remember reading about Sniper having a rear bearing failure but he had about twice as many miles as mine now. Only been caught in the rain a couple of times and never spray directly at the bearing seals.

Hmmm... what do ya'll think?

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post #2 of 10 Old 11-02-2008, 08:20 PM
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Where doe's the vibration seem like it is comming from?

Front,back,center?

Could be tires.

If you suspect bearings pull the wheels & check for smooth operation.
If they are notchy, replace them.

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post #3 of 10 Old 11-02-2008, 08:30 PM
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I get something like that ,,but I thinks it's in the tranny for some reason,,,,may be the front disc's wha wha wha,,,,,,,,,,,

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post #4 of 10 Old 11-02-2008, 08:46 PM
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Check to see if your exhaust mount under the motor is cracked.

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post #5 of 10 Old 11-02-2008, 11:39 PM
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Yeah, is the vibe right around 6000 rpm? That's just where the exhaust mount demons start screaming!

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post #6 of 10 Old 11-03-2008, 05:36 AM
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Mine had a vibration like that pretty low in the RPMs. I found that my Honda windscreen was missing the lower two rubber washers. Found some new washers, properly mounted the screen and the annoying vibration noise went away. The bike still vibrates pretty good there...by the way this is when I'm warming the bike up and holding the throttle open a little. Maybe 2500 - 3000 RPM.

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post #7 of 10 Old 11-03-2008, 06:20 AM
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wish i could help man, just under 5000 on mine, so far





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post #8 of 10 Old 11-03-2008, 07:48 AM
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its the elves...... rotten little elves..



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post #9 of 10 Old 11-03-2008, 09:31 AM
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Quote:
Originally Posted by razorbike View Post
Been on a mission lately to get precise chain alignment
To insure your chain is aligned correctly, when you think you have it right on the markers, spin the tire a bit then look at where your sprocket teeth sit in between the sides of your chain when looking at it from the rear of the bike! The teeth should be right in the middle of the chain, if not adjust until it is and your spot on!!


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post #10 of 10 Old 11-03-2008, 11:09 AM Thread Starter
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Thanks for the suggestions guys. Gonna start checking it over soon. I'm thinking it's either a bearing or the chain. Because of the regular rhythm and how solid it feels. More like a grinding "feeling" rather than a noise.

It's a little confusing though because it feels like it's coming from the center of the bike.

The simplest starting point as HondaJim said will be to check the exhaust mount. The most severe would be something transmission oriented but hopefully not - I've changed the oil religiously and have always run the chain towards the loose side.

Another question though. Noticed that the chain rollers are getting loose. The sprockets still look good but I can pull the chain away from the rear sprocket a bit. No rust or seized links on recent inspection.

Will a chain that's about shot make a repeating sound other than the the usual constant "whoosh" sound?

It's a fool who looks for logic in the chambers of the human heart.
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