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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: gazman on October 12, 2014, 07:35:19 PM

Title: oops I,ve bent it
Post by: gazman on October 12, 2014, 07:35:19 PM

greetings brickheads, I,ve just bought a 94 k1100lt that had low speed impact 25klms for a parts bike but she seems to good to waste, Question is will the front end (triple tree, forks, wheel) off a late 80,s k100 bolt on. as I,ve found one that is being parted out. New parts are way overpriced and k1100 wrecks are scarce especially ones without front damage.Thanks in advance 

Title: Re: oops I,ve bent it
Post by: johnny on October 12, 2014, 08:00:23 PM

greetings gazman...

welcome to motobrick.com...

if you wanna doo your doo dillergence you can click the links below...

94k1100lt forks... (http://www.realoem.com/bmw/partgrp.do?model=0536&mospid=51711&hg=31&fg=42)

cross reference... (http://www.realoem.com/bmw/partxref.do?part=31422310799)

89k100lt forks... (http://www.realoem.com/bmw/partgrp.do?model=0516&mospid=51750&hg=31&fg=42)

cross reference... (http://www.realoem.com/bmw/partxref.do?part=31421454969)

so... the way im reading it is you gotts to know the exact year and model to be sure... butts at this point im saying 80s k100 forks will not fit 94k1100 without some bastardizing...

j o

Title: Re: oops I,ve bent it
Post by: gazman on October 12, 2014, 10:22:25 PM

Cheers johnny, well I guess she can just sit there then. I can wait, maybe just sell it to a mate who,s been trying to buy my other k11. but that was never going to happen. thanks again.. LOVE the site.

Title: Re: oops I,ve bent it
Post by: rbm on October 13, 2014, 09:16:35 AM

I'm going to counter Johnny's assessment with "I think that you could fit the K100 front end to the K1100".

A very popular mod to the K75/K100 is to upgrade the suspension components with parts from later K's.  So, why shouldn't it be possible to go in the opposite direction?  The stanchion diameters are different between K100 and K1100, as is the distance between the stanchions.  The brake caliper mounts are slightly different as well.  However, if you were to swap in the entire front end of the K100, it would be a bolt-on process.  The length of the pivot shaft and diameter of the steering head bearings are the same on K75/K100/K1100.  The forks would mechanically fit.  You'd have to find a place for the ignition switch and fork locking mechanism because it differs greatly between the two bikes.

Another issue may be front brakes.  The K1100 are ABS and possibly the K100 being parted is not ABS.  I'm not sure if the calipers would be compatible with the K1100 ABS, or if the ABS ring & sensor would be able to be retrofitted.  This is something you'll need to check carefully.

Title: Re: oops I,ve bent it
Post by: billday on October 13, 2014, 10:38:26 AM

Quote from: rbm on October 13, 2014, 09:16:35 AM

A very popular mod to the K75/K100 is to upgrade the suspension components with parts from later K's. 

People do that because the later K's have a better front suspension. Why downgrade? I'm sure you could find a K1100 getting parted out.

Title: Re: oops I,ve bent it
Post by: rbm on October 13, 2014, 11:28:05 AM

Quote from: billday on October 13, 2014, 10:38:26 AM

Why downgrade? I'm sure you could find a K1100 getting parted out.

Because the OP is in Australia, not the US.  Canada and Australia for example are not ripe in variety of salvage parts, and don't have the choice given to buyers as in the USA.  Many time, we're forced to make compromises.