BMW K bikes (Bricks)

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1Back to top Go down    1988 K100 Battery Tray on Sat Feb 16, 2019 11:05 am

ush1000

ush1000
active member
active member
Hi guys,

I had an advisory on my last MOT saying the battery was not secure. When I checked the tray, I can't see how it is secured to the bike, the tray just seems to be resting on 4 rubber mounts. The battery itself is nice and secure on the tray with a metal strap over the top tied to the tray.

Any ideas, am I missing something?

Cheers

    

2Back to top Go down    Re: 1988 K100 Battery Tray on Sat Feb 16, 2019 11:13 am

chris846

chris846
Life time member
Life time member
The rubber mounts are supposed to have a M6 male thread bonded top and bottom. Sounds like yours have become unbonded - it happens.

Replacements cheap enough on Oohbay - search for 'isolation mounts M6'


__________________________________________________
The Longest Lunch
    

3Back to top Go down    Re: 1988 K100 Battery Tray on Sat Feb 16, 2019 11:35 am

ush1000

ush1000
active member
active member
Ah thanks, do they have to be specific to the bike? Just thinking of depth as there is not a lot of room to play with?

    

4Back to top Go down    Re: 1988 K100 Battery Tray on Sat Feb 16, 2019 11:51 am

Dai

Dai
Life time member
Life time member
Just to add to Chris' description: search for "20mm x 20mm x 6mm isolation mounts". It narrows it right down to what you want. Also, you will need to cut the forward right mount to length as it's a blind hole.

Now, there is possibly bad news with this. The original four mounts are quite likely to be corroded in solid to the gearbox. I would soak them in some form of penetrating oil and leave it for a few hours before trying to twist them out.

If the rubber comes off (it probably will Rolling Eyes ), slot the top with a hacksaw so you can get an impact driver in. Now, apply a lot of heat and penetrating oil before going in with the impact driver. An alternative to the impact driver is to get a second-cut file and file two relatively parallel edges on each of the buttons. You have a choice at this point; file to a spanner size or grip with a good pair of molegrips.

If that fails (rinse and repeat Very Happy ) you'll need to drill the buggers out. You're going to find that you can get at three out of the four without removing the gearbox but you will need to remove the swingarm to clean the swarf out. Three is enough - forget the fourth one.

If you get to the drilling them out stage and you wander off-centre, you can re-tap to 8mm and drill/file the battery tray to match. You cannot drill and tap the forward right blind hole without removing the gearbox.

OTOH, as one set of mine did, they could just pull straight out. The other gearbox fought me all the way to the re-drill and tap stage. B*st*rd. Razz

Put the new ones in with a lot of copaslip.


__________________________________________________
'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)
    

5Back to top Go down    Re: 1988 K100 Battery Tray on Sat Feb 16, 2019 12:00 pm

ush1000

ush1000
active member
active member
Eek, thanks for the good, scary and bad news - but I love the bike to bits so I will treat her with respect and start soaking in penetrating oil now!! Fingers crossed

    

6Back to top Go down    Re: 1988 K100 Battery Tray on Sat Feb 16, 2019 12:43 pm

duck

duck
Life time member
Life time member
If the rubber pulls off, if you're careful, you can grab the edges of the remaining disk and unscrew.(Using Vise-Grips or whatever you guys call them over there.)

Good idea to put anti-seize on the threads when putting them in and don't screw them in too tightly.



Last edited by duck on Sun Feb 17, 2019 1:04 pm; edited 1 time in total


__________________________________________________
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 (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

7Back to top Go down    Re: 1988 K100 Battery Tray on Sun Feb 17, 2019 12:38 pm

Stumpy

Stumpy
Silver member
Silver member
I had a similar problem with my K100, I bought replacements for the broken mounts. The screws were tight in the gearbox and required the gearbox to be removed. I cheated and used Sugru glue to stick the mounts to the top of the gearbox. The weight of the battery helped hold the tray in place while it set. It is now fixed solid.

    

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