BMW K bikes (Bricks)

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1Back to top Go down   22 Lt top box air braking cured. Empty 22 Lt top box air braking cured. on Tue Aug 18, 2020 2:28 am

MartinW

MartinW
Life time member
Life time member
I had a problem with the lid of my latest top box popping open at 100 Kph. I thought I had sussed the problem being you had to have the lock open for the hook on the lock to engage the latch wire which is true. However on our recent four day adventure the lid kept popping open. In the end I strapped it closed which did temporarily solve the problem. 

Today I decided to get to the bottom of the problem and find out why it popped open even when you couldn't open it  by lifting on the edge. Using Blue Tack ( plasticine) I stuck a blob in the throat of the lock hook. When closing it the wire latch was only just engaging the hook and while stationary it was secure. However at speed I suspect that a bump could cause it to unlatch due to a bit of play in the locking hook.

In order to get the wire latch to get further into the throat of the hook I had to do a bit of bending on the wire latch inorder to move it further into the throat of the hook. Once bent the wire latch didn't go down far enough to engage the hook so a extended the slotted adjustment holes enough for it to engage. In order to see how much engagement I was obtaining during the bending and adjusting with the wire latch slots I kept inserting Blue Tack into the throat closing the lid and checking how far the wire latch had gone into the Blue Tack. Eventually  I got to the point where I was happy with the locking. Plasticine would have been better than Blue Tack as it is softer, whereas Blue Tack being a bit harder requires using different thicknesses and more checks.
Regards Martin.


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K75s Hybrid
    

2Back to top Go down   22 Lt top box air braking cured. Empty Re: 22 Lt top box air braking cured. on Tue Aug 18, 2020 7:26 pm

brickrider2

brickrider2
Life time member
Life time member
I never understood why BMW thought that case opening the way it does was a good design. Glad you got it sorted.


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1996 K1100LT
    

3Back to top Go down   22 Lt top box air braking cured. Empty Re: 22 Lt top box air braking cured. on Tue Aug 18, 2020 8:38 pm

Laitch

Laitch
Life time member
Life time member
@brickrider2 wrote:I never understood why BMW thought that case opening the way it does was a good design.
During the rush to market, that must have been the least expensive way they could figure how to pad the case for the pillion rider's back and still be able to open it.


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1995 K75 81,000 miles
22 Lt top box air braking cured. Usa-lo10
    

4Back to top Go down   22 Lt top box air braking cured. Empty Re: 22 Lt top box air braking cured. on Wed Aug 19, 2020 9:03 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
@Laitch wrote:
@brickrider2 wrote:I never understood why BMW thought that case opening the way it does was a good design.
During the rush to market, that must have been the least expensive way they could figure how to pad the case for the pillion rider's back and still be able to open it.
+1


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Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

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