Join Date: Nov 2004
Location: Gruene Texas .. DL650K4
guys, the THUDDING has been cured on a number of bikes by lowering the stock screen and tilting a tad more upright. I think these posts are on this forum somewhere. if not here, Rapidforum. When I say lowered I don't mean stock/slider lowered, but drilling new holes in the stocker to let it go about one inch or more lower than the stock position. According to those who did it, the buffeting is completely gone [meaning the head-rattling ear-damaging kind]. The flipside is that its a chin spoiler for sure, so bugs and road grit are going to be your lot in life.
Supposedly the laminar lip also cures the thudding, though it doesn't do much else. at least its cheap.
I can say that the Givi, if you mess with its position enough, can get rid of the thudding, but you will still get blown about quite a bit. its windy. I am pretty tall, so I use the Givi in an un-supportedly-high setting: the top two holes of the Yoke are exposed above the fairing/dash/tupperware. I always say it ain't perfect by a long shot, but one good advantage is that it is no worse at top speed than at moderate speed, in fact it may be at its best between 80-90 mph
p.s. there is also a very old post by roy b. [I think it was rb] about flipping the stock screen upside down and drilling something. The point was to not have that flip-lip on the topside, as it is there to induce turbulence, so that no one in their right mind would buy another Suzuki.... brilliant engineering. Anyway, according to the post, no buffeting, just smooth wind [and a lot of it]
If evolution is valid, why do I still bite my tongue occasionally?