BMW K bikes (Bricks)

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1Back to top Go down   Front end woes Empty Front end woes Sun Aug 16, 2015 9:02 am

DaleRT

DaleRT
Silver member
Silver member
Hi, Making good progress on the K100 5/86 RS. It now finally runs. Thanks for the assistance. 
Which brings me to the front end, The next challenge - the Disc rotors are under spec. & the upper section of the front forks look bent [as best i can check visually while still mounted] 
Is the fork/s fixable, do you have to buy one or a pair ?  Are other models interchangeable ? 
Are the bolt on rotors advisable or is the complete unit best to buy [hope iv'e explained it ok]
Looking forward to any help or guidance 
Cheers   Dale

    

2Back to top Go down   Front end woes Empty Re: Front end woes Sun Aug 16, 2015 9:22 pm

Holister

Holister
Life time member
Life time member
Buying a complete rotor and carrier will be more expensive. You'll find they probably come bolted anyway.
Bolting is ok. Make sure you get the SS bolts and nyloc nuts with the rotor.
Its easy to change over although some say it takes a bit of effort to get the old rivets out, just cut the flats off with a 4" cutting disc (rotor side so you dont damage the carrier). Only took me about 15 mins.
Install nyloc nuts to the inside

Ebay
MotoHansa - Sydney (pricey)
Show n Go - Adelaide (ok prices)
Munich Motorcycles - Perth


__________________________________________________

1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
  Front end woes Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

3Back to top Go down   Front end woes Empty Re: Front end woes Mon Aug 17, 2015 5:57 am

Dai

Dai
Life time member
Life time member
As regards the discs, if you can live with cleaning the wheel once a week or so I'd go with cast iron rotors because they're better braking material. The downside is they do drip rust in the rain and the wheels don't like it.

Are you sure the stanchions are bent? I suspect you're (hopefully) suffering from an optical illusion. Was the bike in an accident? If you're talking about the run between the top and bottom yokes then the headstock will be damaged and the frame will be a write-off, but equally I'd say that if you can see damage in that area then you'd see the damage to the bottom of the headstock too.

You need to drop the forks out and put a known accurate straightedge against them (a spanky new builders spirit level will do the job if you think you can see a bend). Minor damage can be rolled out with specialist equipment but truthfully, I suspect that a set of forks from ebay or a pair of stanchions from BMW would be cheaper (and safer) than the repair route.

My experience of checking and repairing front ends all revolves around Moto Guzzis, so someone here may have better knowledge about Ks.


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

4Back to top Go down   Front end woes Empty Re: Front end woes Mon Aug 17, 2015 6:22 am

Ed

Ed
Life time member
Life time member
good to hear you moving along with it Dale.


__________________________________________________
1993 K1100RS  0194321         Colour #690 Silk Blue  aka " Smurfette"
2018 Kart upgrade.
Front end woes 10_x_110
    

5Back to top Go down   Front end woes Empty Re: Front end woes Mon Aug 17, 2015 6:44 am

AL-58

AL-58
Life time member
Life time member
If you're forks are bent, I'll have a set from an 86 K100RT available shortly.  I haven't picked up the bike yet(hopefully this weekend), but it's going to be fitted with a K1100 front end I have laying around so the forks will then be excess to requirements.  The disks might be good ones too, I've no idea till I pick it up.

Whereabouts are you in the mountains? I'm in Mt Riv.

Al


__________________________________________________
'87 K100RS/HRD sidecar (1100 motor)  sc25 
'92 K100RS-16v (Paint it Black)

'87 K100RT with Paralever backend

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

Front end woes K-dogs10
    

6Back to top Go down   Front end woes Empty Re: Front end woes Tue Aug 18, 2015 4:10 am

DaleRT

DaleRT
Silver member
Silver member
Thanks Dai for the questions. Went and did some checking.
   Background is the bike had a slide down the road - why? don't know.
The previous owner bought it in this condition several yrs ago - now lost interest.
   The fairing is badly ground away on R/H side. The wheel & tire show no evidence of a severe impact.

Looking at the bike from the front
   The R/H disc sits in the center of its caliper But the L/H disc touches the R/H side of its caliper.
Undoing the bolts in the yokes for the L/H stanchion & bottom of the L/H fork and then rotate the stanchion 120*  the brake caliper moves position so the disc now sits in the center of its caliper.

   Moving from the front of the bike to the R/H side and view the stanchions side-on they are parallel from the top yoke to the lower yoke,  but as you look down the stanchions the far one bends to the rear of the bike.
   Also, to remove the front axle required some force.

I'll check out those contacts Kapt'n

Al - thanks for the offer. Because of the above, i think the forks are bent and so i would like to see if your forks will suit.
I'm in Katoomba and don't mind dropping down when convenient .

Cheers

    

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