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post #1 of 9 (permalink) Old 09-07-2015, 10:22 AM Thread Starter
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Windscreen issue

I have a 2002 Vulcan 750 and recently bought a new windscreen and no matter how high or low I position it I get a buffeting (sorry if that's the wrong term, I'm kinda new to this) on my helmet starting at about the 55 mph range and getting worse once I get to 70 mph. I'm 6'-2" so because of my height can I NOT use a windscreen or is there another answer?
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post #2 of 9 (permalink) Old 09-07-2015, 10:29 AM
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One word. Lowers. As you redirect the wind around and over your windshield, it is also directed under and as it passes the gas tank it can increase in speed. Like a venturi effect, and is directed at, you guessed it, your head. Put your hand down by the tank and you'll feel the wind. Lowers are small plastic or acrylic shields mounted below the windshield either on the forks or the windshield mounts. Google for homemade motorcycle lowers. I made a set for $30. Your windshield should be positioned with the top level with your nose.
Hope that helps.

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post #3 of 9 (permalink) Old 09-07-2015, 11:12 AM Thread Starter
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Thanks birdhunter I'll give it a try..........
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post #4 of 9 (permalink) Old 09-07-2015, 03:57 PM
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You'll be amazed at the difference. I'd get on the highway and my helmet would be all over the place. Put the lowers on, and much better. Still a little from the top, but no where near as bad.

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post #5 of 9 (permalink) Old 09-07-2015, 07:06 PM
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Sometimes making as small change to the angle of the screen can help. Amazing what a few degrees an do. Sounds like you've tried different positions...do make small adjustments at a time.

Lowers can make a big difference. So can "venting" the screen by cutting a small hole in it just above the headlight.
Some helmets are also more prone to buffeting than others too.

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post #6 of 9 (permalink) Old 09-07-2015, 09:23 PM
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Quote:
Originally Posted by Knifemaker View Post
Sometimes making as small change to the angle of the screen can help. Amazing what a few degrees an do..............
That's what I did to the small screen on my 750 to clear the top of the helmet buffing. 'Corse on the 1500 I just raise the shield 2 inches when gonna 4 lane a while.
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post #7 of 9 (permalink) Old 09-08-2015, 07:48 AM
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X2 ON THE LOWERS!!!!!!!!!!!!!!!!!!!!!!!!!! Holy ****SRS I am still FLIPPING AMAZED at the difference. I made mine out of plexiglass from Lowes and man WOW. ZERO helmet buffetting.

Also my bike is rock solid on the highway with no buffeting by trucks and wind. It adds stability like you wouldn't believe.

Did them just like this

http://www.instructables.com/id/Moto...ow-deflectors/

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post #8 of 9 (permalink) Old 09-08-2015, 02:05 PM
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I find knifemaker's comment on venting the screen above the light interesting since I have, inadvertently, sorta done that. My screen is a Plexifairing and upon initial installation I purposefully raised it up so the portion of the screen that protects the hands would, in fact, be directly in front of the hands. This had the effect of raising the lower edge of the screen above the light and it actually sits atop the tach/speedometer housings. What I have noticed is that almost no rain comes through, or at least not enough to matter, yet conversely when it's hot outside enough wind DOES come through to keep me from getting too hot since there really isn't any stagnant air. I wonder if that helped kill the head buffeting situation because I suffer no buffeting at all. Until knifemaker's comment about venting I had not heard about that effect before. Cool!
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post #9 of 9 (permalink) Old 09-08-2015, 02:56 PM
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There was a company (whose name escapes me) that made windscreens for the early FJR 1300's that basically had a rectangular hole in the bottom center of the screen. (About 9" long 3" wide) that cured buffeting on those models.

If you look at the later models (see a photo here: https://en.m.wikipedia.org/wiki/Yamaha_FJR1300# )

You can see a gap in the bottom center of the screen that allowed air to come off the nose of the fairing, go under the screen (and over the instrument cluster) .... Thus allowing air to flow behind the screen.

I would guess it's possible to solve many problems with turbulent air folks have (with various windscreens) by simply cutting a similar hole in the shield.

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