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25 October 2007 @ 02:44 pm
R1100R Mirror bluuuuuuuur blues.  
Ok, folks, first post to the community. And I'm starting out with a search for some tech advice.

A bit of quick and hopefully not too dull background. A couple years ago I bought a used '97 R1100R from a friend to use for weekend touring with the wife (my VFR hurts her back as a passenger), and occasional commuting. After letting it sit in the garage for over 18 months (long story) I revived it (short story: new battery, fresh fuel, new plugs, carb sync, TPS adjustment) and all is good with the world. With two minor exceptions.

1: It still suffers (though only mildly) from the well known mid-range hesitation issue. That's actually less noticeable now, after the revival, than before I put it away.

2: At highway speed, the mirrors are effectively a couple of round blurs. That's actually more frustrating than the momentary hesitation.

So, anyone off hand know an easy solution for the mirror vibration? I haven't started checking through the other internet forums as yet, and I suspect there's some after market mirrors that'll cure the issue. Just wanted to start here first, and maybe add a little more life to the group.

Cheers,
L4J
 
 
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The sole survivor of a 35 minute delayviolin on October 26th, 2007 12:07 am (UTC)
carb sync

Erm....

RE: Mirror shake-- perhaps finding some way to add some weight near the end of the stems-- same idea as bar end weights. Any idea if it's from engine vibration, road vibration, or wind? I don't know that it affects the solution too much either way.
live4javalive4java on October 26th, 2007 12:35 am (UTC)
Thanks for the response, Violin

Counterweight of some kind might work, but I suspect they vibrate in sympathy with the bars, which are in sympathy with the motor. One of those resonant frequency things. Have too see if I still have a section of wheel weight tape around to try out.
(Anonymous) on October 26th, 2007 06:09 am (UTC)
Get the throttle bodies synched (your bike is injected) and the valves adjusted and the vibes will die down.

Are they standard mirrors? They should be either black or chrome round mirrors.
live4javalive4java on October 26th, 2007 11:31 pm (UTC)
I sync'd the throttles (said carbs above - old habit) at idle and to be as even as possible between 2500 and 4000 RPM. Have to take care of the valve adjustment though, since I hadn't done that yet.

As far as I know, they're the stock mirrors. Round, black. Different mounts right to left (not just mirror image). Have to see if valve adjustment will damp down the vibrations enough to make the mirrors stop quivering.

L4J
live4javalive4java on November 29th, 2007 02:16 am (UTC)
Better late than never . . .
Just a followup, here, quite a bit belated. After adjusting the valves, performing another sync on the throttle bodies, and (at a friend's recommendation) switching to a different brand of spark plug, the vibration is pretty much gone. There's still some around 4600 or above, but that puts me over 75, which I can live with. For most cruising where I'm worried about it, the mirrors are steady enough to see.

Thanks for the help those who chimed in.

L4J