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Check for source of vibes, too
On both my Kawasaki W650 and the T100, sync'ing the carbs smoothed out engine vibes somewhat. Also, I've found that a major source of vibes on both these bikes was a result of exhaust systems being bolted up in a stressed position, as in when you replace the mufflers after installing a rear tire on the Bonnie. Though this may sound ridiculous, any time I remove and replace the silencers on my T100, I semi-tighten all the connections (clamps and mounts), then go for a quick run up and down my street in the lower gears, revving up and revving slow. Then I do the final tightening, once these parts have 'homed' to their natural position. Even semi tightening and revving the engine in neutral seems to help home the pipes.
When I replaced the entire right pipe and silencer (one piece unit) on the Kaw, the formerly smooth bike was miserable to ride with so much vibration coming thru the saddle and handlebars. Thankfully, I found that it was being transmitted from the engine to the frame via the exhaust system.
Several years ago, BMW's K100 4 cylinder bikes transmitted really bad vibes from engine to handlebars that were especially noticeable since the engine had no counterbalancer. In addition to replacing under warranty the footpeg mounts and footpegs with isolated units, BMW found that the tubular frame on some bikes was a bit wider than the engine mounts, and tightening the mounts was putting a torsional load on the frame. The solution .... remove the mounting bolt, and insert a thin shim between the engine and the mount.
Bob
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03 T100 Lucifer Org and Silv: 122/42 jets, TORs, 17T, UNI filter, no AI, Polaris bellmouth, Metz 880 tires, Progressive 440 shocks (105/150 springs), Intiminators, Thrux fork caps, gaiters, MotoTwin low bars, 6024 lamp, htd grips, 12v outlet.
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