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1Back to top Go down    Bare bones '85 K100 converting to an LT on Sun Nov 13, 2016 4:52 pm

jaysales49

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Hi all. I have just acquired a bare bones '85 K100. All it has is a windscreen. I would like to convert it to an LT which I know was first produced in 1987. Does anyone know what years the LT body parts (fairings) will fit. Any other info would be greatly appreciated. Same handlebars? Same cables? Hardware? Etc. Thanks in advance. This is my winter project. New England weather isn't too great in the winter.

    

92KK 84WW Olaf

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I have an 84RT and a 92LT and have swapped a few parts between them.

For the most part as far as I can see the entire of the fairing and its brackets are identical so if you can get your hands on a complete fairing, storage boxes, storage box frames, storage box lids, leg panels, interior baffles, spider bracket and theand all the bits that go with it you are a lot of the way there.

Chances are you will buya new screen as most used ones are not great.

If you are lucky it will have the indicators/turn signals and headlight in it. If not you will need them.

If you have the flat or RS bars, youwill be looking for new RT/LT handlebars, RT/LT cables and the brake pipe from the front master cylinder to the splitter. I changed my bars and ordered a used one, when it came it was for the LT heated grips. The bars are different at the grip ends but you simply cut the lugs off if you don't use heated grips. If you plan on fitting the BMW onesmake sure you get the bars for them.

You may also need the impact pad for the switches and ignition mounting.

The handlebar switchgear does not change but you will have to wriggle the wiring a bit to get the extra length. Check no loose connections before you put the tank back!!

Battery/side panels changed at some point too and I don't think are interchangeable, important to know the exact model so a photo is important.

A little hint too, if you don't know the state of the head bearings its worth doing them before you fit the fairing as its just easier to get at everything.

While you have the tank off change the fuel hoses and also the vacuum pipe and crankcase breather pipe....small money but easy to do at this time.


__________________________________________________
1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 58,645 now 60,500miles
    

duck

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An LT is just an RT with a few minor "upgrades" so RT parts are the same as LT parts for just about everything and all years are the same. The lower side and radiator panels as well as some omunting brackets are different on a K75RT but a K75RT can be a good parts source for you.
Since you are starting "from scratch" fairing-wise you might want to consider installing an electric windscreen from a 94/95 K75RT or any year K1100LT. Both will mount to the K100RT/LT main fairing body as that part is the same across all of K75/K100/K1100 RT/LT bikes. Note that you'll need to add some additional wiring but it's been done before and shouldn't be too hard if you already have some basic electrical skills.
You can look up part numbers at realoem.com to confirm cross-model compatibility.
I think the only significant differences between years are the side covers but if you swap in an 86+ tail cowl then that shouldn't be an issue.

The one LT feature you won't be able to put on an 85 is the fuel gauge since the 85 bikes have a different fuel level sender.


__________________________________________________
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
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

4Back to top Go down    K100 conversion on Sun Nov 13, 2016 7:16 pm

jaysales49

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Thanks for the info. I just want to clarify that my bike is not an RT. It it a plain K100. Not sure if this makes a difference or not. Thanks

    

duck

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Doesn't matter that your current bike is "naked" and not an RT.

Except for some idiosyncrasies common to all 85 models, your frame and engine are the same.

Another thing to consider would be swapping in some forks from a newer K100 or K75 is order to get a factory fork brace.


__________________________________________________
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
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

92KK 84WW Olaf

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Duck

Would I be right in thinking the change on the fuel levelgauge happened with the change from the bolted down tank?

If itsa bare bones K100 and has a radiator cowl and belly pan those parts are worth a lot.


__________________________________________________
1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 58,645 now 60,500miles
    

duck

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The change from the bolted down tank did happen at the same time in the model changes from 85 to 86 but the changes are not directly related to each other for any reason I can discern.

Not sure about pre 85 (since we didn't get those in the US) but all of the 85 tanks I've seen have the bottom of the tank stamped the same as the later tanks where the newer fuel level sender went. But of course there isn't a hole in the middle of it.


__________________________________________________
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
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

92KK 84WW Olaf

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On my 84 RTthe tank is bolted down at the rear with a single 10mm bolt and that changed with the revision that took the grab handles away from the seat which changed from steel to plastic base.


__________________________________________________
1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 58,645 now 60,500miles
    

indian036

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@92KK 84WW Olaf wrote:On my 84 RTthe tank is bolted down at the rear with a single 10mm bolt and that changed with the revision that took the grab handles away from the seat which changed from steel to plastic base.
Olaf, I think those changes were separate, as my two '85 RTs have the pinned tank, not bolted, but have the grab handles incorporated in the (metal based) seat.

On further pondering, I'm not sure how correct that is, as both these bikes were originally single seat Police bikes.

Ultimately, anything that is attached can be considered suspect as to its originality unless you have good knowledge of the entire provenance of the bike!

For what its worth, its my understanding that the tank with the single bolt at the back had the dual stage fuel level sensor at the front left, and the two pins and clips version had the single stage float based sensor attached underneath the tank nearer the back. Again, its my understanding that all those sensors had the fuel gauge sender as well as the warning light switch, though in many cases only the warning light switch was connected to anything.

Because of the possibility of changes over the life of any bike of that age, I suspect the presence or absence of any feature isn't usually a reliable indicator of any other part.

I'm happy for the gurus to correct my understanding of these issues.

Bill


__________________________________________________
1985 K100RT VIN 0028991 My original Very Happy (Historic rego)
1985 K100RT VIN 0029036 BOB the Blue Old Bike (Historic rego)
1990 K100LT VIN 0190452 Work in progress
1984 K100RT VIN 0023022 Work needing lots of progress

1986 K100RT VIN 0090542 Work needing lots and lots of progress
1993 K1100LT VIN 0183046 Work in progress
1993 K75S VIN 0213045 Newest toy, slightly non-original
    

10Back to top Go down    Re: Bare bones '85 K100 converting to an LT on Mon Nov 14, 2016 12:25 am

jaysales49

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You guys are great. A lot of information for me to digest and use as I work on my project. Keep it coming.

Thanks!!! Laughing

I'll post photographs as I go. Thanks again.

    

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