BMW K bikes (Bricks)


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1Back to top Go down    K75s Fairing rattling on Sun Aug 27, 2017 10:42 am

JGT

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Whilst going over rough patches, pot holes etc. in the road the fairing knocks and rattles. Looking at the exploded views in the Clymer manual it appears to be secured, quite a way back, at 4 points via bolts and rubber grommets, so quite a lot of unsupported weight ahead of the fixings. As the bike is now 30 years old would replacing these grommets stiffen things up and improve the situation as its no 5 minute job taking the fairing off. Thought I would seek advice first before purchasing anything. John


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1987 K75s 1969 Bultaco Matador
    

2Back to top Go down    Re: K75s Fairing rattling on Sun Aug 27, 2017 10:55 am

charlie99

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yes ...all things rubber do shrink - perish
keep in mind that there are usually large washer type thingys used for the mounting of the rubber insulators , I wonder if there are any missing ?

it is quite common that the brackets crack as well , especially with a drop event

good luck !!


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

3Back to top Go down    Re: K75s Fairing rattling on Sun Aug 27, 2017 1:19 pm

Point-Seven-five

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The fairing on my K75S moves around a lot as well. I think the "S" designates "swinger". With so much mass cantilevered out there it is no wonder it is hard to restrain it. Also, the distance amplifies the motion so a couple mm of movement at the mount translates to cm out near the speedo and windshield. I've gone through all my mounts carefully tightening and checking for looseness and can find no real reason for all the movement. Seems to be the nature of t he beast.


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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
    

4Back to top Go down    Re: K75s Fairing rattling on Sun Aug 27, 2017 10:50 pm

duck

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A lot of the K75S bracketry is plastic so it moves around a bit more than it would if it were metal. The cluster mounting on K75Ss is very prone to being wobbly.


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

5Back to top Go down    Re: K75s Fairing rattling on Mon Aug 28, 2017 4:58 am

JGT

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Interesting. Will replace the grommets when I dismantle it. I can live with the movement, its the knock, knock that irritates. Will try and find out what is hitting what and hopefully eliminate with the aid of rubber insulation. John


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1987 K75s 1969 Bultaco Matador
    

6Back to top Go down    Re: K75s Fairing rattling on Mon Aug 28, 2017 5:26 am

92KK 84WW Olaf

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Very important to get the bracket to frame mountings tight and in good order.

The fairing to bracket mounts must have good grommets and must also be done up tight. I went through all mine on the RT and it made a big difference, grommets were old/missing and nuts were missing in some cases.


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1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 58,645 now 60,500miles
    

7Back to top Go down    Re: K75s Fairing rattling on Thu Aug 31, 2017 7:34 pm

WoodyAUK75

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Can you move the fairing up and down by hand? I had two holes cracked out of the part that mounts to the headstem, and it would not tighten properly.

    

8Back to top Go down    Re: K75s Fairing rattling on Fri Sep 01, 2017 5:17 am

JGT

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@WoodyAUK75 wrote:Can you move the fairing up and down by hand? I had two holes cracked out of the part that mounts to the headstem, and it would not tighten properly.


Yes I can. That sounds worrying. Still waiting for the rubber parts to arrive from Balderstones before I investigate. John


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1987 K75s 1969 Bultaco Matador
    

9Back to top Go down    Re: K75s Fairing rattling on Fri Sep 01, 2017 7:13 am

MartinW

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My 1992 K75s fairing is solid, minimal movement, unlike instrument pod which has a fair bit of movement.
Regards Martin.

    

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