Vibration at ~ 78 MPH - K-Bikes.com - Excellence in Motion
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post #1 of 15 (permalink) Old Dec 9th, 2005, 2:13 pm Thread Starter
 
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Vibration at ~ 78 MPH

I just bought a 04 GT. Transitioning from a Harley. I notice a slight vibration apparently comming from the engine area?? right around 78 mph that does not stop so far up to ~ 115 mph. It is very consistent, below 78 mph it goes away, above 78 mph it returns and stays. No reduction on power or anything else, just a little unsettling. Any thoughts??
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post #2 of 15 (permalink) Old Dec 9th, 2005, 2:52 pm
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Question

assume you're in 6th gear?

'04 GT...Orient Blue...Staintune...Ohlins...Power Commander
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post #3 of 15 (permalink) Old Dec 9th, 2005, 4:01 pm Thread Starter
 
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I was in 6th, and I experimented several times during different rides.
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post #4 of 15 (permalink) Old Dec 9th, 2005, 5:12 pm
 
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What happens if you downshift to 5th? Check the tightness of the bolts and screws holding the exhaust on. Many times that is an exhaust rattle.
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post #5 of 15 (permalink) Old Dec 9th, 2005, 5:45 pm
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I believe a vibration that comes in at 4,700rpm and smoothes out at 5,000rpm is normal. But one that doesn't stop is not. Check all the exhaust brackets and engine to manifold nuts.
Bruce C
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post #6 of 15 (permalink) Old Dec 9th, 2005, 6:14 pm
 
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My '04 RS with 4,400 miles is smooth at all engine speed. Except at idle, as we all know. Your experience does not sound normal.

Ron
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post #7 of 15 (permalink) Old Dec 9th, 2005, 7:00 pm
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wondering about tire balance. By the time tire imbalance gets to the rider it can feel like something else.
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post #8 of 15 (permalink) Old Dec 9th, 2005, 7:03 pm
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Quote:
Originally Posted by jimmm
wondering about tire balance.
Me too.
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post #9 of 15 (permalink) Old Dec 9th, 2005, 7:31 pm
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Quote:
Originally Posted by banjoman
I just bought a 04 GT. Transitioning from a Harley. I notice a slight vibration apparently comming from the engine area?? right around 78 mph that does not stop so far up to ~ 115 mph. It is very consistent, below 78 mph it goes away, above 78 mph it returns and stays. No reduction on power or anything else, just a little unsettling. Any thoughts??
I also think tires, but try this. It's free, and it can't do any harm.

Losen the three 10mm screws (head size) on the muffler. Take your palms and slap the muffler side to side (like rubbing a dogs ears, just a lot rougher). Tighten the three screws. Sounds impossible, but it's smoothed out vibrations before. And like I said, it's a free try.
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post #10 of 15 (permalink) Old Dec 9th, 2005, 11:12 pm
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Check tire balance front and rear, either check the motor mount torque values yourself or have a dealer do it, then trashcan the stock exhaust and mount up a Staintune. Better sound, less weight, and no more vibratoin in the 4K range--dead smooth from idle to redline. I put 22K on my '04 GT in the 12 months I've owned it, it's smoother now than it was new--to the extent that in twisties I've at times bumped up against the rev limiter without realizing I was getting close....
You shouldn't be getting any appreciable vibration and for sure should not vibration that stays with you as the RPM increase.
Just MHO,
Best,

GTRider
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