BMW K bikes (Bricks)

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1Back to top Go down    Which Windshield on Mon Feb 20, 2017 5:07 am

wilbo

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Hello everyone, I'm on with my K100 Basic restoration and gathered all parts except windshield.  I am torn between the original small windshield and the larger touring spec one.  As I am going to be paying out quite a bit of money for this part I want to get it right, for this reason I thought I would ask for opinions from anyone on here that has either of the windshields that I am looking at below.  Is the small cowl screen good at diffusing air or does it not do much?

This is the original
And this is the touring version


__________________________________________________
Current Stable
1983 BMW K100
1996 BMW R100RT
2009 Honda CBF1000
2003 Aprilia RS250
1996 Kawasaki GPZ500s
1955 James Colonel 225cc
    

2Back to top Go down    Re: Which Windshield on Mon Feb 20, 2017 11:29 am

Point-Seven-five

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I am 6'1" and, personally, I have found that anything that does not come at least to eye level when I am seated on the bike will throw turbulence at my helmet. 

I would rather ride with my helmet in clean air than what is thrown up by the windshield.  To that end I have cut down the screen on my K75S by about 15cm. 

My K75RT has a tall enough screen to actually do an acceptable job, and with my RS, well, I just live with it.

Bottom line, shorter is better unless you have something very tall and wide.


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Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

3Back to top Go down    Re: Which Windshield on Mon Feb 20, 2017 1:26 pm

JGT

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I agree with point-seven-five. I fitted a 3 inch taller screen on my K75s which now gives my helmet a real pounding. The top of a screen, ideally, should be 12 inches in front of your eyes and 1 inch below your line of sight. You are then in reasonably still air. I would go for your second picture but you may still require an additional clip on piece.John


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1987 K75s  1969 Bultaco Matador
    

4Back to top Go down    Re: Which Windshield on Mon Feb 20, 2017 6:36 pm

wilbo

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Hi guys thnks for the replies above, I shall take the advice on board.  I think I shll get the original small screen to start with as I did have a touring screen on my BMw R100RT and it was also a nightmare for helmet buffeting, ended up buing a smaller screen to avoid it.


__________________________________________________
Current Stable
1983 BMW K100
1996 BMW R100RT
2009 Honda CBF1000
2003 Aprilia RS250
1996 Kawasaki GPZ500s
1955 James Colonel 225cc
    

5Back to top Go down    Re: Which Windshield on Mon Feb 20, 2017 6:51 pm

Point-Seven-five

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I think a lot of these screens are just for styling with no thought for airflow management.  Unless you are behind a plexiglass barn door a windshield is worse than useless.


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

6Back to top Go down    Re: Which Windshield on Mon Feb 20, 2017 10:46 pm

dee why

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Wilbo,

For what it's worth, taking into account the rider, handlebar, seat height variables:

I find the standard basic screen is slightly noisier than no screen, but no significant buffeting for me.

I initially fitted it as a looks thing, but I do believe it helps at speed and it has been on the bike for many years.

Cheers,

Dee


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Dee Why

04/86 K100 VIN 0009479 Columbia Silver
    

7Back to top Go down    Re: Which Windshield on Mon Feb 20, 2017 11:07 pm

ainsjac

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I have an original touring screen on my 83 basic. Over the years I have experimented with it to obtain the best results for my height, 6'3''. Spacers were made to fit in between the top screen holes and the bracket. The screen is now further away from my face and a slightly higher angle. What works for one person may not work for all.


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AINSJAC
1983 K100 basic vin 0003960 colour red
1987 K100RT vin 0094685 colour, orange peel, sorry, pearl
    

8Back to top Go down    Re: Which Windshield on Tue Feb 21, 2017 12:01 am

Laitch

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Point-Seven-five wrote:Unless you are behind a plexiglass barn door a windshield is worse than useless.
My bike came with one of those—set below line-of-sight, good rain protection, no buffeting. I removed it when I installed lower bars. I like the breeze instead. It worked well though. Got rid of the Corbin, too, for a regular bench.


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1995 K75T 60,000 miles
    

9Back to top Go down    Re: Which Windshield on Tue Feb 21, 2017 4:17 pm

nino


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Air deflector on the top of windscreen kills buffeting and excessive noise. There are a lot of it on Ebay. Adjustable deflector is good investment in comfort. In summer lower, in winter higher position, but not over line of sight.

    

10Back to top Go down    Re: Which Windshield on Tue Feb 21, 2017 6:35 pm

wilbo

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dee why wrote:Wilbo,

For what it's worth, taking into account the rider, handlebar, seat height variables:

I find the standard basic screen is slightly noisier than no screen, but no significant buffeting for me.

I initially fitted it as a looks thing, but I do believe it helps at speed and it has been on the bike for many years.

Cheers,

Dee
Thanks Dee, I think I am going to go with this one as it is also the original one for the K100 Basic model which is what I have, also half the price of the larger screen!


__________________________________________________
Current Stable
1983 BMW K100
1996 BMW R100RT
2009 Honda CBF1000
2003 Aprilia RS250
1996 Kawasaki GPZ500s
1955 James Colonel 225cc
    

GF Wollongong

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I am 6ft / 181cm and have an K100RT with the deflector. I find it pretty useless and noisy. Ear plugs lessen it but music helps distract me. 
I was thinking it was the helmet (AGV K4) - something that wasn't a problem on an earlier bike (Suzuki 650SV).
So it seems that I will be looking on ebay etc for a screen to cut down and increase the air onto the helmet. 
What with BMW getting it right - who have thought?

Mate and I went for a ride (Wollongong ... Northern Road... Bell's Line of Road ... Lithgow). Sneaking down the LHS of long line of traffic ... happened upon someone on a clean and tidy Red K100 or 1100 RS (with abs). Had a quick hello and chat... then away. Greetings my friend.

And isn't Bell's Line of Road a treat (first time for me on bike) - especially when you have passed the police and you can follow a car prepared to go for it. And upon descending the final hill we were riding into town and there was a local standing stock still with beer (read: pitchfork) looking like something out of "The Hills Have Eyes" - creepy stuff.

Time to replace the throttle body manifold rubbers ... have got all the stuff. Any tips before tank, air filter assembly and other bits come off? Am trying to eliminate vibrations at 3500 to 4000rpm and balance throttle bodies (at speed) with manometer.

Good riding.

Guy

    

12Back to top Go down    Re: Which Windshield on Tue Mar 14, 2017 7:36 am

RicK G

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Get an electric adjustable screen from a K1100 it cuts the noise down heaps, makes an enormous difference.


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

13Back to top Go down    Re: Which Windshield on Tue Mar 14, 2017 8:20 am

Dai

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The low screen on the RS irritated the hell out of me too. Even the 'extended' aftermarket screens you can buy I found were too noisy, so when I found myself with only the lower half of one of these aftermarket screens after last year's get-off, I bought a piece of 3mm Lexan (polycarbonate) and made a really extended screen some eight inches (140mm) higher than standard. That shut the wind up.


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'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

14Back to top Go down    K1100 screen onto K100 on Wed Mar 15, 2017 6:50 am

GF Wollongong

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Thanks for that Rick.


Seeing that I do have a K1100LT sitting under a tarp I will give it serious thought.

You have sewn the seed of breaking the bike (or at least it becomes naked). However I am very mindful of the distaste this leaves in some mouths.

Was intending to sell the K11 - it's a 1993 and I can't register it under historic plate and I'm too tight to go full rego.

Will have one last go at trying to get it to start (will put this into separate post).



Guy

    

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