K75S Windscreen Buffeting...

[alkam49]

Hi -  When I bought my '86 K75S back in mid July and rode it from Hobart to Sydney I was a bit surprised at the buffeting from the windscreen past my helmet...  Worst was at 100km+ on a highway following a car or truck...
I'm 5'7" and a bit - 171cm and my helmet is an almost new Shark Carbon 'R'  which are super quiet on naked bikes,  ergo my R80... 
Find & fit another screen...  OK:  I found in Sydney a company called Hand Crafted Fibreglass who make screens for a wide range of bikes under the name:  Slipscreens. 
Cameron from the shop got me a dark tint a little lighter than my BMW oem screen and we cut about 3 inches off the top so it just shows the start of the curl on the wind 'deflector lip'...  the result is spot on first time!!! 
Perfect,  for the first time at 100 -  120kph on back roads or motorway no buffet,  can follow behind a car or a little further back from a truck,  no buffet.
Brilliant...  thought I'd share the info to those interested.

Cheers AM

[kennybobby]

thanks for sharing, where does the air hit you now--is your face/helmet now in smooth air, above  or under it?

i've cut about 1-1/2 inches down off of the OEM k75S to try to quiet the turbulent wind noise, but i may need to cut more like yours.  i still get a lot of noise at my neck area unless i sit up a couple of inches higher and get fully into the smooth air. 

Helmets seem to be designed such that you have to tilt your head up with the bottom edge parallel to the road to reduce wind noise (think motogp racers laying their chin on the tank), but this is not a natural or comfortable angle to hold for sport touring.

[alkam49]

Ha,  that's the million dollar question:    I used to get the odd bug around mid-top of the face-plate,  now I get every bug full in the face and the wind is hitting just below my face-plate and getting a bit around the tops of my shoulders too...  Cant complain tho' - cos the buffeting is 'gone'.   
No added noise,  the Shark Carbon R is extremely quiet on naked bikes, just a little noisier on the K bike but I wear silicon plugs anyway.
I remeasured for you -  and yes,  it is just on 3" - maybe 3 & 1/8th...  Have fun,  be brave!  Cut!