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Old 09-09-2007, 04:13 AM   #1
seratt
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Vibration at mid 5k rpm

Just wanted to get a couple opinions on this.

My 96' Magna (v4 750) is silky smooth except from around 5300 rpm to 5500 or so. It's more of a buzz at my feet then a vibration actually. It "buzzes" at this rpm in all gears.

I just recently changed the plugs, oil, and cleaned / re-shimmed the carbs. I've read elsewhere that it could be a carb syncing issue, but figured I'd ask to see what you guys thought.

Thanks,

Tim
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Old 09-09-2007, 04:28 AM   #2
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depends.....not always a problem, most bikes have a point where everything is off and it vibes a lil. If its not a huge vibe and just a little tickle in the pegs I wouldnt worry about it.
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Old 09-09-2007, 07:00 AM   #3
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+1,
Although anytime the valves are adjusted you should also synch the carbs.
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Old 09-09-2007, 08:24 AM   #4
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ITS CALLED A CRITICLE VIBRATION POINT OR RESINATING FREQUENCY? SPELLING SUCKS,
BUT EVERY THING VIBRATES AT A CERTIN FREQ! WE SEE IT IN OUR CO GEN OR TURBIN IN THE PLANT, SO WHEN ANYTHING MOVING OR ROTATING GETS TO A CERTAIN RPM OR FREQ LEVEL IT START TO VIBRATE KINDA LIKE IT WANTS TO JUST BURST APART I HAVE SEEN IT HAPPEN ON TRUBINS.

CARS HAVE HARMONIC BALINCERS ON THE CRANK PULLY, TO HELP WITH OFF BALANCE OF PARTS AND FREQUENCY LEVELS!

I HOPE I EXPLAINED THAT RIGHT! LIKE MY BUSA IT NOT SURE THE RPM BUT I KNOW IT DOES IT AROUND 90 MPH, JUST UP PAST 95 IT IS SMOOTH ! I DO NOT THINK YOU HAVE ANYTHING TO WORRY ABOUT!
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Old 09-09-2007, 09:43 AM   #5
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Hmm... thanks that explains that I have heard tell of the vibration but never really noticed it. I guess thats because I never hit 90 before I guess in a few more years I will untill then its 40mph for me

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Originally Posted by H2447INTX View Post
ITS CALLED A CRITICLE VIBRATION POINT OR RESINATING FREQUENCY? SPELLING SUCKS,
BUT EVERY THING VIBRATES AT A CERTIN FREQ! WE SEE IT IN OUR CO GEN OR TURBIN IN THE PLANT, SO WHEN ANYTHING MOVING OR ROTATING GETS TO A CERTAIN RPM OR FREQ LEVEL IT START TO VIBRATE KINDA LIKE IT WANTS TO JUST BURST APART I HAVE SEEN IT HAPPEN ON TRUBINS.

CARS HAVE HARMONIC BALINCERS ON THE CRANK PULLY, TO HELP WITH OFF BALANCE OF PARTS AND FREQUENCY LEVELS!

I HOPE I EXPLAINED THAT RIGHT! LIKE MY BUSA IT NOT SURE THE RPM BUT I KNOW IT DOES IT AROUND 90 MPH, JUST UP PAST 95 IT IS SMOOTH ! I DO NOT THINK YOU HAVE ANYTHING TO WORRY ABOUT!
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Busa club. why did you not mention that? that makes things all nice and peachy
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Old 09-09-2007, 10:40 AM   #6
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Thanks guys, this helps.

The only thing that sucks is the vibration is right at cruising speed for me. 75 mph. So I either stick to 70 or 80. Usually 70, and I feel like grandpa in the process.

Maybe I'll change out my sprocket to bring those rpm's down some on the highway.
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Old 09-09-2007, 11:58 AM   #7
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what gear are you in while cruising? if im on a straight shot, and it is light traffic, ill kick it into 6th and just hold it steady, and it is usually below or right after that 5k-5.5k vibration point. if in heavy traffic, ill just kick it into which ever gear puts me at 6-7k so im right in the section of the power band that if i crack open the throttle it will take off if i need to move around cars or change lanes
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Old 09-09-2007, 12:34 PM   #8
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3rd gen magna only has 5 gears =/ So that puts me at 5400 or so at 75. Redlines around 9800.


I've been tempted to sell both of my bikes and buy a VFR anyways. Love the 99 to 2000 (5th gen?) ones. We'll see. These cruisers kill my shoulder man. I have to ride pretty forward. If I sit back in the seat, like most do on these, my shoulder BURNS like .
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Old 09-09-2007, 01:46 PM   #9
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3rd gen magna only has 5 gears =/ So that puts me at 5400 or so at 75. Redlines around 9800.


I've been tempted to sell both of my bikes and buy a VFR anyways. Love the 99 to 2000 (5th gen?) ones. We'll see. These cruisers kill my shoulder man. I have to ride pretty forward. If I sit back in the seat, like most do on these, my shoulder BURNS like .
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Busa club. why did you not mention that? that makes things all nice and peachy
Strength does not come from winning. Your struggles develop your strengths. When you go through hardships and decide not to surrender, that is strength-
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Old 09-09-2007, 01:51 PM   #10
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Quote:
Originally Posted by NoFear View Post
be a man wear a jacket or sun tan lotion
lol. I had to read this a couple of times to figure out what you meant. I do wear full gear though.

No, I have a bad right shoulder from working out years ago. So, unless I hug the tank (not hug, but I have to lean forward, can't sit back), my shoulder hurts like . Feels like someone presses a hot coal up against my back.
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Old 09-13-2007, 08:41 PM   #11
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..
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Old 09-13-2007, 08:43 PM   #12
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Hmm... thanks that explains that I have heard tell of the vibration but never really noticed it. I guess thats because I never hit 90 before I guess in a few more years I will untill then its 40mph for me
on the busa's it happens at 4600 RPM in all gears
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