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Lots of vibration, any ideas why?

  • Thread starter Thread starter Anonymous
  • Start date Start date
I took the mufflers off again last night. I sat on the bike and revved it up to 3,500 rpm several times. I don't know if I just missed it last time I did this, but the vibration is certainly still there.

I am confident now that exhaust has nothing to do with it.

I also checked the timing with a timing light, and it was bang on. I might re-check the valve clearances(fairly easy to do) and re-sync the carbs (again).

Something inside the engine is causing the vibration and that is what I'll have to concentrate on now. One of our mechanics at work has a stethoscope I'll try and borrow to see if I can locate any unusual noises.

It's looking more and more like a winter tear-down project unless something jumps out at me soon.

Believe me, if I ever find the problem, I'll let everyone know.
 
I checked the carb sync yesterday and they weren't far off at all. I didn't even need to make any adjustment. I also checked the valve clearances, also no adjustment required, all within spec.
I re-tourqued every nut or bolt I could get at with the valve cover off.

I have officially admitted defeat for now. I'll continue to monitor if anything changes, but I'll just ride it as is, the weather is too nice around here to take anything else apart.

A big thanks again for all the input from everyone.
 
Duke, here is something to try. Have you checked and made sure the exhaust collectors are not cracked anywhere? i think you said you have the original chrome ones still.

i just swapped the exhaust on my 550 this weekend, the old 4-1 was rusting and cracked. when i pulled it off, one of the pipes (which has been welding on in the past twice) had cracked yet again. not only did it make the bike louder, run worse, but it added a vibration. i rode an hour with the new exhaust on saturday...and it felt entirely smoother!

can't wait to get my new grips on :)

~Adam
 
Are you talking about the header pipes directly off the engine? If so they appear to be in good condition, but I guess they could use a closer look.

I do know that one of those goofy exhaust clamps has a crack in it on the No. 4, but in order to change it I would have to cut and weld the pipe, something I've been avoiding. Its been cracked since I've had the bike.

Maybe I'll take the complete exhaust off again and have a good look at it.
 
i'm talking about the area where the 2 pipes come together...then run into the mufflers. sometimes the pipes rust or crack there...and that was causing some vibration on my bike before i swapped exhaust.

if this crack you said you have is on the collector, it could be letting exhaust sound/noise into the frame and motor, instead of out the back of the bike.

~Adam
 
The cracked exhaust clamp I'm referring to is one of the four that attach the header pipes directly to the engine. They each have two holes for mounting bolts and one of the clamps is cracked around one of the holes.

I don't think this is the cause of much vibration, but I'll check the crossover pipes underneath which you have mentioned.
 
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