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Post By Wheelie
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2 Feb 2022
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Quote:
Originally Posted by Tim Cullis
A clamp-on deflector is a really good idea for cold weather or if you experience buffeting - a major problem for many KTM 790/890 owners.
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I've ridden my 790 with high and low screens, with and without lower deflectors, and yes there is buffeting noise, but I've also ridden a variety of blood bikes with screens, and they buffet too. On KTM owners pages I've seen reports of people trying other screens and they also buffet. My conclusion is any screen aims to send the air over the rider's head, but it then descends on their head vertically, and that's what makes the helmet noise. The best you can do is reduce it, and wear earplugs.
As such, yes, clip-on screens do work in that they deflect the air a bit further up without increasing the screen height. I have a Puig one and it's quite effective, though nothing eliminates the buffeting entirely. It's firmly fixed with allen screws and I can't see anybody nicking it in a hurry.
Note I own two screens, a low one for rides likely to contain off road work (and this is probably the one I'll use across Asia despite the extra wind blast to the face) and a high one with Puig clip-on for road touring.
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2 Feb 2022
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A while back I owned a Vespa GTS 300 that came with an illegally tall screen (couldn't look over it). I could sit somfortably and smoke a cigarette on that thing, doing over a 100 km/h. But if it started raining or snowing, or the sun was low in the sky - it was all guesswork as of where the road was.
The aim for me is not to get rid of wind, noice and buffeting - if so, I can just get into my car and get full climate control.
When it is cold or wet, it is nice to be able to deflect a bit more of the weather off ones torso and visor - without having to tuck down low. Also, to get rid of a noticeable ammount of noise and buffeting would be nice. If I could deflect more bugs and rain drops off the visor, that would be great also.
I don't expect any magical results where I can ride without ear plugs or even eye protection, nor rain gear or even heated gear on the coldest days - it is all part of the experience of riding a motorcycle and is to be expected. I wouldn't bother making a change for any lower than a "10%" improvement, but anything higher is worth the investment. I would be a little bummed out if I couldn't achieve more than "10%", but it would still be worth it. If I could cut the "bad" in half, I would be extatic. Anything inbetween would be quite satisfactory. As of what gains to expect, I have no idea.
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2 Feb 2022
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This is an interesting topic for me as I spent ages trying to find a solution for the 790, using small and large screens in both high and low positions, and also no screen at all.
Quote:
Originally Posted by Tomkat
I've ridden my 790 with high and low screens, with and without lower deflectors, and yes there is buffeting noise, but I've also ridden a variety of blood bikes with screens, and they buffet too. On KTM owners pages I've seen reports of people trying other screens and they also buffet. My conclusion is any screen aims to send the air over the rider's head, but it then descends on their head vertically, and that's what makes the helmet noise. The best you can do is reduce it, and wear earplugs.
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Just to be clear for anyone reading this, we are not talking about a steady windblast but rather a situation where the helmet is getting shaken from side to side, your vision might blur and the journey becomes distinctly unpleasant to the extent that it puts you off going for a ride. It's like the effect when a backseat passenger in a car opens the window, but on steroids. Not everyone is affected the same, there might be some influences from rider height, seat height and the helmet they are wearing.
One tip I've read is to remove the winglets underneath the headlight. I've not tried that as my deflector solution works for me, but the suggestion may be to do with reducing the negative air pressure behind the screen. Others suggest removing the handguards, or even the mirrors which seems a bit extreme
Quote:
Originally Posted by Wheelie
The solution does however leave a large gap at the bottom when the screen is at the elevated position.
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The gap between the screen and the deflector is exactly for the purpose of adjusting the pressure behind the screen. And as long as your deflector is adjustable you can move it around to get the best result. The reverse curve at the top of some third party screens might also be intended to reduce negative pressure behind the screen.
Here's a 790/890 thread showing an MRA deflector. My first impressions are that this combination is too tall, but then the guy is 6'2" with a long torso.
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Last edited by Tim Cullis; 2 Feb 2022 at 17:26.
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2 Feb 2022
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Seems like it is more difficult to deal with wind on the 790 than to make this offroad suitable.
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29 Mar 2022
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I am riding now for decades an never used windshield.
But may be the reason is, i don't go on german autobahn with 200 km/h.
Most of the windscreens guide the air precisely to the helmet. (if you are tall)
That makes a lot of noise and can make turbulence as well.
I prefer to ride without a windsreen and enjoy some wind arround my nose.
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