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1Back to top Go down    My 1990 K100LT, trying some upgrades :) on Fri May 16, 2014 2:54 pm

Finnigan

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I got this bike a couple months ago and decided to ride it around until I changed anything. Here's how I got her.




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1990 k100LT
    

Finnigan

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Installed new injectors, VERY big difference in performance and throttle response




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1990 k100LT
    

Finnigan

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Took off fairing, luggage, handlebars. Put on NOS switches, new headlight and blinkers, and superbike handlebars


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1990 k100LT
    

Finnigan

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Put on larger diameter stainless steel headers and a supertrapp muffler, VERY pleased with the sound and throttle response after removing a couple discs to increase back pressure.


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1990 k100LT
    

charlie99

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good effort

don't like the shorty look ...(just a preference thing ) but if it works why not ?!!...


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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
    

Kyle10

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@Finnigan wrote:Put on larger diameter stainless steel headers and a supertrapp muffler, VERY pleased with the sound and throttle response after removing a couple discs to increase back pressure.


Where'd you find your headers? Nice.


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1983 Honda VF750 007713
    

Finnigan

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@charlie99 wrote:good effort

don't like the shorty look ...(just a preference thing ) but if it works why not ?!!...
Thanks, I'm not a fan myself, thought it would be a little longer. I love how I can see the rear wheel though, and with it being so short I didnt have to use the weld-on hanger tabs they sent me.

My plan is to polish the heck out of the whole exhaust so it looks seamless and not so shorty-ish


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1990 k100LT
    

Finnigan

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Thanks Kyle, I actually got the headers off Duck (forum member) back in April. They look great to me and they have a clean 2" outlet that a lot of universal mufflers fit onto


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1990 k100LT
    

Finnigan

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Red LEDs to brighten the dash


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1990 k100LT
    

k75RT Keith

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Looks very nice.

BTW what did you do with the bits you removed?

    

Finnigan

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They're all in a pile in the garage.


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1990 k100LT
    

Finnigan

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Fitting up the new GSXR front end


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1990 k100LT
    

13Back to top Go down    Re: My 1990 K100LT, trying some upgrades :) on Thu May 22, 2014 11:37 am

dkimpel

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When you are done with the front fork Mods can you post a parts list and any issues with the install?


Thanks
Douglas

    

Finnigan

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Hi Douglas,

If you want info on just the fork swap it was actually pretty easy. I got a steering bearing set from allballz (spelling?) and with the spacers they provided it dropped right in. I was even able to use the stock BMW bearing races.

The hard part now is making wheel spacers and finding the right wheel to put on since there are almost no 4 hole brake rotors with ~300mm diameter


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1990 k100LT
    

15Back to top Go down    Re: My 1990 K100LT, trying some upgrades :) on Fri May 23, 2014 10:50 pm

robmack

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Have you seen THIS about another GSXR front end on a K75 and THIS about wheel and brake selection?


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Robert
1987 K75 @k75retro.blogspot.ca
2011 Moto Guzzi V7 Racer
http://k75retro.blogspot.ca/
    

Finnigan

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Machined up some new spacers, front wheel is snug as a bug


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1990 k100LT
    

17Back to top Go down    Re: My 1990 K100LT, trying some upgrades :) on Sun Jun 08, 2014 11:50 pm

Finnigan

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Not much of an update, got the wrong caliper spacers in the mail so I'm being sent a new set. After they get here I'll be able to mock up the whole front end, order a tire and start wiring in the new dashboard (so excited for this!)

In the mean time I still can't let go of the possibility of putting a new rear wheel on the bike. I'm busy with SolidWorks stress tests and talking to machine shops to get the adapters made up...but I still can't seem to figure if there is enough room at the swingarm/wheel/tire gap. I don't want to get the wheel I want on there after hundreds of dollars just to have a skinny tire.

Here's a mockup of what it would look like on the back if anyone is interested.





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1990 k100LT
    

goldwingblade

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@Finnigan wrote:Installed new injectors, VERY big difference in performance and throttle response




Which injectors did you use, the 4nozzle type off ebay?

    

Finnigan

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@goldwingblade wrote:
@Finnigan wrote:Installed new injectors, VERY big difference in performance and throttle response




Which injectors did you use, the 4nozzle type off ebay?

http://www.ebay.com/itm/201073757416?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649


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1990 k100LT
    

charlie99

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@Finnigan wrote:Not much of an update, got the wrong caliper spacers in the mail so I'm being sent a new set. After they get here I'll be able to mock up the whole front end, order a tire and start wiring in the new dashboard (so excited for this!)

In the mean time I still can't let go of the possibility of putting a new rear wheel on the bike. I'm busy with SolidWorks stress tests and talking to machine shops to get the adapters made up...but I still can't seem to figure if there is enough room at the swingarm/wheel/tire gap. I don't want to get the wheel I want on there after hundreds of dollars just to have a skinny tire.

Here's a mockup of what it would look like on the back if anyone is interested.




just be aware that there will be a BIG offset of the rear wheel if you are using the standard mono lever rear drive .....the paralever rear end (off later models ) has a different offset and these wheels are made to fit that

be cautious about the standard touring panniers as well, you will wear out the inside side of them real quick wit the wider tyre
just a heads up

looking forward to see how it comes together

cheers !!


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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
    

robmack

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Charlie, it looks like these are not later K or R wheels, so all bets are off concerning offset. Since Finnigan is talking with machine shops to make up an adapter, the shop can build offset into the adapter if required.


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1987 K75 @k75retro.blogspot.ca
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http://k75retro.blogspot.ca/
    

RicK G

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It is the width of the rim and how close to the swinging arm it is that determines how far offset it is and a 5inch rim on a monolever will be offset by a minimum of 19mm. You just cant get them in centre because they are designed to use a 2.75inch wheel and there is not enough room to get it far enough to the right to make it centre.


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"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats." from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

charlie99

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agree rick, ..if its a mono lever, with the standard shaft casting ...unless you could produce a modified rear arm ...as i have seen on ben kinghams (bsk speedworks ) machine ...possible some others as well


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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
    

24Back to top Go down    Re: My 1990 K100LT, trying some upgrades :) on Tue Jun 10, 2014 12:50 pm

Finnigan

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Everyone has valid arguments here, I've been trying hard to see if this is even possible. If not I'm not going to force it. I have no intention of putting in on crookedWhat a Face


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charlie99

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good onya for trying finnigan ....


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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
    

Finnigan

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Got in the garage last night expecting to make progress, but the bike had different plans;

Caliper spacers don't fit even though they were supposed to be made for the forks (awesome)
Rear wheel will not fit unless I custom machine a new carrier (~$400) and even then it will sit about 1/2 an inch off center (even more awesome)
The dashboard I'm installing has issues fitting on the triple tree clamp so I have to rig up some kind of bracket to hold it to the riser holes
Ordered a 2000 BMW k1200RS wheel as a back up plan but I could only find one in silver so now if I want to use the front wheel I already made spacers for I have to either paint them or get them powder coated before I can mount the new rubber

After opening more doors than I closed I decided to organize the garage and began installing shelves (not awesome)

Motivation, to put it simply, is not high at the moment....

Stay tuned


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27Back to top Go down    Re: My 1990 K100LT, trying some upgrades :) on Fri Jun 27, 2014 12:53 pm

Finnigan

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Hi Everyone,

After two weeks of back injury I finally wobbled my way to the garage to get more wrench time in on the bike. The new rear wheel came in and fits well on the swingarm, clearance is going to be an issue when the tire is on but I'll cross that bridge later. Now that the front and rear wheel don't match my plan is to save money by powder coating them to match and hopefully will look close enough when the front rotors are covering up most of the mismatch. The only other option is to source a new wheel, get new spacers made, find new rotors that are the same size etc. I just don't feel its worth it.

In electrical, i'm still making a mount for the motogadget dashboard that doesn't look like it was a DIY job but I only have hand tools and a dremel so the going is slow.

I've decided to ditch the ABS system and am working on removing all the components without making too much of a mess.

Finally I'm trying to fit on some universal Tomaselli rearsets but as of now it looks like its more trouble than its worth.

Have a good weekend!








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1990 k100LT
    

Finnigan

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Anyone need spare parts?

Got stock front end including fairings and panels
ABS brake system (front and back)
Stock wheels
Some controls and switches that are in working condition but ugly

Stay tuned for pic updates Very Happy


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1990 k100LT
    

RicK G

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The only way you will get that wheel centred is to use a paralever rear drive.


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"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats." from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

30Back to top Go down    Re: My 1990 K100LT, trying some upgrades :) on Thu Jul 03, 2014 12:06 am

Finnigan

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From what bike?

Edit: I'm pretty sure the BSK k100 has the same rear wheel as this and a monolever drive. Wonder if they are racing with an offset wheel or maybe they ground the mating surface of the rim down a few millimeters.




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1990 k100LT
    

charlie99

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they have a modified swing arm ...that allows for more right hand side movement of the wheel
to get back to centre


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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
    

Finnigan

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Are there details of the modifications anywhere?


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1990 k100LT
    

RicK G

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They just bolt in and all you need is the later model gearbox with the tags to attach the anchor arm of the paralever and considering yours is a 1990 then it is probably there.
You need the complete paralever setup from a K100RS 16v or a K1100LT/RS including the shockie.


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"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats." from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

robmack

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I think Finnigan meant "Are there details of the modifications to the monolever swingarm anywhere?".

Have you tried contacting BSK Speedworks to ask how it was done?


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1987 K75 @k75retro.blogspot.ca
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http://k75retro.blogspot.ca/
    

35Back to top Go down    Re: My 1990 K100LT, trying some upgrades :) on Thu Jul 03, 2014 12:33 pm

Finnigan

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Hey Robmack, I contacted BSK last night and they already got back to me. They said that no changes to the swingarm were made.


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charlie99

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i stand corrected ... but im sure i have seen a marvelous modified swing arm on one of his bikes ...with the 5 + inch rear it definatly looked like a fabricated tube . wish i saved that pic .

seeing more pics just recently it is a standard swing arm ...sorry for my confusion to all


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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
    

Finnigan

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No problemo Charlie, we all need the input and if something doesnt look right (light the obviously offset rear tire) its great that the issue is being brainstormed. I appreciate the comments, keep them comin!


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38Back to top Go down    Re: My 1990 K100LT, trying some upgrades :) on Thu Jul 03, 2014 11:20 pm

Finnigan

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Almost finished the front end but need taller risers to clear the fork tube adjusters (grumble grumble)

Got the final drive off and checked the splines, they look pretty amazing for 129k on the clock -whether thats the actual mileage is another story, but still!- Cleaned them well and smeared on some moly. I know the full job entails taking off the swingarm but the end looked so good I didn't bother this time around.

Playing around with the rearsets is posing lots of problems currently, and theres the issue of the misaligned rear tire.

In other news the center stand disengaged while i was working on her, thank goodness I got out of the way but the crank case took the grunt of the fall on a wheel bolt which was laying on the floor and put a bullet sized hole right through the cover! It was an impossible mess and took forever to mop up all the oil to get enough traction for me to push her upright again.

I'm drinking beer tonight...


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39Back to top Go down    Re: My 1990 K100LT, trying some upgrades :) on Thu Jul 03, 2014 11:50 pm

rosskko

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@Finnigan wrote:
In other news the center stand disengaged while i was working on her, thank goodness I got out of the way but the crank case took the grunt of the fall on a wheel bolt which was laying on the floor and put a bullet sized hole right through the cover! It was an impossible mess and took forever to mop up all the oil to get enough traction for me to push her upright again.

I'm drinking beer tonight...

That sucks. It is not fair when you are trying to do something good for the bike and it lets you down by having a little rest on a bolt. Naughty bike.

Not sure if you have the front wheel on, but what some do when transporting is tie the stand to the wheel/ front of the bike so it can't fold back. Hindsight is always wonderful.

ps. I am drinking beer tonight too.


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1986 K100RT VIN 0093801K100RT with summer fairing for a northern visitor

Basic/2 6308802K100CJ05/1988

K1100RS 0194321
    

40Back to top Go down    Re: My 1990 K100LT, trying some upgrades :) on Fri Jul 04, 2014 12:15 am

Finnigan

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Sounds like something I'll do in the future, cheers brother


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charlie99

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sad to hear finnigan ... dontcha hate that !!

drinking beer tonight as well


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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
    

Finnigan

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1990 k100LT
    

charlie99

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mmm nice !


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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
    

Finnigan

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Doing quite a bit of searching for my swingarm problem; got some answers and some questions for anyone out there.

GOOD: Looks like I can use the gearbox I have if I'm going to drill my own hole for the paralever strut.
BAD: Still don't know what about the 1100 setup kicks the wheel over. For example, are the swingarms different shapes? are the final drives offset?


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RicK G

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They are very different. Any paralever set up from a K100 16v or a K1100LT/RS will fit and put the wheel in centre.
You will need the swingarm, drive, shaft (both ends), shock and the anchor arm with bolts.
Also either K100 16v RS footpeg plates to clear the right side swingarm or K1100 footpeg plates and battery/ABS carrier frame so the plates attach.
If you go to real OEM you can see the differences http://realoem.com/bmw/select.do the K100 are in archive and K1100 are current.


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"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats." from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

robmack

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The swingarm for the monolever is totally different shape than the paralever. The paralever housing has a huge bulge at its end to accommodate the two-part drive shaft and the final drive's pivot bearing assembly. The monolever has no need for a pivot bearing so it is slim where it joins the final drive.

Compare the images below where the driveshaft housing meets the final drive:




The diameter of this bulge continues into the final drive giving the housing an hourglass profile towards its center region. Consequently, the position of the flange against which the wheel mounts is offset more than the monolever final drive. The hourglass profile and greateroffset combined provide the clearance needed to accept wider wheels and tires.

You'll have to somehow emulate this in your monolever by adding shims to the joint between the wheel and final drive. You may also have to grind down some of the housing where the tire may rub. The risk you run is to put too much offset into the wheel tracking, which may negatively affect handling and cornering.


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1987 K75 @k75retro.blogspot.ca
2011 Moto Guzzi V7 Racer
http://k75retro.blogspot.ca/
    

Finnigan

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Wow great info guys I appreciate you sharing your resources with me!

I'm seeing a big similarity between final drives for K1100, K1200, and R1100. I'm guessing that its important to get the final drive that matches the swingarm and have been looking at the gearbox end of the drive shafts. They all look similar and some are quite a bit cheaper than others. I wonder if the k1200 or r1100 assemblies would work the same as the k1100/k1/k100rs4v


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RicK G

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The spline on the centre of the shaft is different on a K1200 and also length. As for the R1100 I have often wondered so keep us in the loop about that.
I have also heard that the later K1100LT had the same centre splines as the K1200 but cant say for sure.


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"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats." from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

Finnigan

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I was able to get measurements for the k1200 drive shaft. does anyone have a k100 they could take measurements on to compare it to???


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1990 k100LT
    

92KK 84WW Olaf

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@RicK G wrote:They just bolt in and all you need is the later model gearbox with the tags to attach the anchor arm of the paralever and considering yours is a 1990 then it is probably there.
You need the complete paralever setup from a K100RS 16v or a K1100LT/RS including the shockie.

Did I read that the K1200 gearbox also fits for the swinging arm modification......and its 6 speed...?


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1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 84,600 miles
1983 K100RS 0011175 Fricka 29,000 miles Damn K Pox
    

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