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I've had the same problem on my '06 and it still drives me nuts. The bike was easily the smoothest thing I'd ever ridden when I took it home new. After about 5000 miles it started to get the trailing throttle buzz, most noticeable in 5th and 6th using even throttle on the freeway. On a trip over the summer it became much worse.
I've tried various things including slacking/tensioning the chain, adjusting the clutch cable, I even went so far as to put on a new chain and sprockets at 10,000 miles saving the old ones just in case. No improvement.
Since the vibes started I've fitted new Anakees front and rear, no effect.
I have noticed that if I pull in the clutch lever *just a little* while the vibes are heavy, just enough to take up the slack in the cable without actually disengaging/slipping the clutch (RPMs remain the same), the vibes almost totally disappear. I pulled off the clutch cover and had a look around at the plates, basket, pressure plate and actuating rod but nothing seemed out of sorts. The basket sorta felt like it had a tiny bit of radial play but so did a partially disassembled bike sitting right next to the Tiger, so I don't think that's it.
I wonder if it's a case of too much end float on the clutch shaft? Anyone know if this is even adjustable (engine strip)? Maybe a bummer bearing down in there somewhere? I've come to live with the vibes and maybe they've even gotten better, but I'd sure like to be rid of them.
On a possibly related note, shifting on my (religiously maintained) bike has definitely not improved with age and seems worse than ever, though it's kinda fun playing its little game. For a while.
Despite this, I sure love the bike!
One other thought would be unbalanced throttle bodies, I took the bike to the dealer at around 9,000 miles and asked for a check of that, was told to come back for the 12,000 mile service! Okay, you don't want my money then! Anybody do a throttle body sync at home? Do you need a Tuneboy or some kind of high-tech balancer? I can't really see how I'd run the thing with no tank on it, I guess I could rig up fuel lines and power, but I think the airbox has to come off also, doesn't it?
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