geezer1967
Velociraptor
Posts: 33 
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Post by geezer1967 on Jun 8, 2015 14:36:20 GMT
My much loved GS1150EFE has one, just one annoying characteristic: at 4000-5000 rpm I get a harmonic buzz in the handlebars. Naturally this rpm range corresponds to "normal riding speeds", so it becomes a pain in the hands. Has anyone done experiments on changing handlebar weights or perhaps using a section of Bar Snake either in the handlebars or on the fairing brackets?
Or anything else that works?
Spirit
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geezer1967
Velociraptor
Posts: 33
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Post by geezer1967 on Jun 9, 2015 0:08:36 GMT
...actually an ES problem, but who's counting? Almost everyone since I've had NO replies....
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Post by arnout on Jun 9, 2015 15:49:44 GMT
Well.. The buzzes on my 1327EFE seem less pronounced than those on my Katana fitted with a stock EFE engine..
To avoid my right hand becoming numb quickly I swapped the nice but very thin Renthal grips for some thicker (foam/gel?) onces with a similar appearance and I inserted a diy handlebar weight (bolt+nut through rubber block) into the aluminium drag bar..
These two alterations have cut the buzzing down a lot.. Only occasionally still have a slight hint of numbness on long rides at a constant speed..
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geezer1967
Velociraptor
Posts: 33
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Post by geezer1967 on Jun 9, 2015 19:01:52 GMT
That's the problem...it's an ACE touring bike, but 3 hours of 75mph+ will leave your hands feeling numbish. There's GOT to be a way to cut it down....on my first Classic Katana we moved the turn signals from the fairing to the frame (already threaded holes available) and it reduced the bar buzz by 2/3 at once. That's why I'm thinking of (1) adding some bar snake to the bars (2) adding some bar snake zip tied to the mail fairing bracket. II'll rev it up and see what vibes the most then zip tie bar snake to that place. Would be nice to know if someone else had done so before though.....?
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Post by captain chaos on Jun 9, 2015 19:46:23 GMT
Bandits have dampers screwed on the frame (one near the headstock, one in the tailpiece). They are basically lumps of steel, approx 0,5kg each.
Only reason I can think of is to kill vibrations. Might be worth a try?
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geezer1967
Velociraptor
Posts: 33
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Post by geezer1967 on Jun 11, 2015 2:13:20 GMT
..I guess my idea wasn't new, and I guess I'll start there...
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blower1
Velociraptor
Posts: 49
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Post by blower1 on Jun 12, 2015 7:03:27 GMT
I have -86 1327 EF with trued and rewelded crankshaft, no vibrations. Then I have -84 1135EF on original condition, bad vibrations about 4000rpm range.
I think the best thing (not the cheapest and the easiest) to do to get the vibrations down is truing the crankshaft.
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Post by bigyellowthing on Jun 20, 2015 20:31:28 GMT
I'm told by a Vibration White Finger specialist that tungsten bar end weights reduce vibes appreciably enough to allow people to ride who otherwise would have to pack up.
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geezer1967
Velociraptor
Posts: 33
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Post by geezer1967 on Jun 21, 2015 21:19:24 GMT
Tungsten bar end weights available where...?
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Post by bigyellowthing on Jun 22, 2015 20:02:08 GMT
That's where you need a friendly lathe wrangler. The OHA in question has suggested tungsten as the heaviest thing readily available. There isn't a simple solution but heavier the better.
Maybe something like solid steel, slightly bigger than standard? Sadly aftermarket are largely decorative.
Have you tried changing the front / rear sprockets to move the resonance to a less commonly used speed range? |
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Post by gammaboy on Jun 23, 2015 1:48:18 GMT
Unicorn Japan do a set of bar end weights - not sure if they're actually heavier than stock though. www.unicorn-japan.jugemcart.com/?pid=1208185Maybe try taping some lead Roof flashing around your existing bar ends to see if going heavier helps. |
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Post by abdw on Jun 23, 2015 2:45:31 GMT
My old katana had horrific vibration through the handlebar at motorway speeds, bar end weights made a massive difference to that, they were much larger bar end weights than i've seen before.
Definitely worth a try, at very least might move the harmonic frequency slightly, a change is a good as a rest an all that!
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Post by abdw on Jun 23, 2015 2:46:24 GMT
They were same sort of length as these! |
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Post by gammaboy on Jun 24, 2015 0:00:15 GMT
Yeah, Kats and RG500s both have solid alloy bars with big lead filled bar ends - I often wonder if replacing them with the carbon bars that are available might help?
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geezer1967
Velociraptor
Posts: 33
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Post by geezer1967 on Jun 25, 2015 1:07:12 GMT
Wow,those are big. Wonder if there are any contemporary Suzukis that have larger bar end weights that'd fit?
And yeah, my 1000 Katana had TERRIBLE bar viration until I moved the turn signals down to the threaded frame bosses and off the fairing - it cut vibration in half.
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