My 1985 K100 now after much work.

fishboy316 · 1 My 1985 K100 now after much work. Wed Apr 13, 2022 8:02 am

fishboy316

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My 1985 K100 now after much work. Img_2018

https://servimg.com/view/20418063/11
https://servimg.com/view/20418063/7
After many hours this bike is pretty sweet. Love the way it rides. Love the way it looks. Hate the center stand! Still working on the pulsating in the front brakes. That one is kicking my butt. All in all I will have $1500 into so far(I stress "so far). Not bad for a quality bike.

Last edited by fishboy316 on Wed Apr 13, 2022 9:30 am; edited 1 time in total (Reason for editing : Add pics)

moriarti · 2 Re: My 1985 K100 now after much work. Wed Apr 13, 2022 11:51 am

moriarti

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Personally im happy to find a pulse Very Happy

. However in this case its more likely to be Warped discs, On a previous mot this was found to be the problem on my K .When they have stood for a long while, the pressure of the pads can MARK the discs, causing the pulsating You may be able to clean them up if you very lucky Cool

When the bike is on the brake testing rollers and brake applied if its MARKS on the disc or slight warping the bike (HOPS) And this is a fail Sad

Last edited by moriarti on Wed Apr 13, 2022 12:37 pm; edited 1 time in total (Reason for editing : Brain warming up)

Arlina · 3 Re: My 1985 K100 now after much work. Wed Apr 13, 2022 1:37 pm

Arlina

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It is warp-6 red Very Happy

fishboy316 · 4 Re: My 1985 K100 now after much work. Thu Apr 14, 2022 7:51 am

fishboy316

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Thanks for the replies! How would you clean the rotor? Steel wool and brake cleaner or something else? I have another set of wheels with rotors on the front wheel. I may give that wheel a shot. They have tires on them but will need replacing. I also have new brake pads I can put on. I also have found the bike to get a little squirrely at times during slow speed corners. At speed she handles nicely. It's a nice bike but I am learning they have some "things".

moriarti · 5 Re: My 1985 K100 now after much work. Thu Apr 14, 2022 10:28 am

moriarti

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Cleaning rotors .Use an Angle Grinder with a floppy disc ,to get best results .Poor Handling on Ks. The main culprits are TYRES, Old,miss worn under inflated. 2 headstock bearings if the grease is old and dry this will give the steering a wobbly feel at low speed Very Happy

have fun

fishboy316 · 6 Re: My 1985 K100 now after much work. Thu Apr 14, 2022 12:56 pm

fishboy316

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With afloppy disk? You mean break open an old disk? Never heard of this. Have been looking at tires. These are old.

Thanks for thehelp
Bill

92KK 84WW Olaf · 7 Re: My 1985 K100 now after much work. Thu Apr 14, 2022 1:30 pm

92KK 84WW Olaf

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I had a slight pulse in my RS. . . . changed the wheels which meant front discs off and onto a different wheel. Pulse gone, so incorrect as in slightly uneven mounting can also do it. Make sure the mounting points on to the wheel are really clean. But more likely to be warped discs.

moriarti · 8 Re: My 1985 K100 now after much work. Thu Apr 14, 2022 1:43 pm

moriarti

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fishboy316 wrote:With afloppy disk? You mean break open an old disk? Never heard of this. Have been looking at tires. These are old.

Thanks for thehelp
Bill

FLAP disc is trade name ,they are for light/medium work not heavy grinding .Old tyres are a NO NO on Ks My 1985 K100 now after much work. 161205

. New rubber transforms the BEAST into a machine on rails My 1985 K100 now after much work. 723598

fishboy316 · 9 Re: My 1985 K100 now after much work. Thu Apr 14, 2022 2:45 pm

fishboy316

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I crack me up!!! It's a flap disk. I had no idea what you were talking about!

Thanks!

What are the optimum size Tire for a K100?

When this thing is decelerating it feels like it want to shake itself to pieces sometimes and sometimes it is much more slight. I will check the mounting locations.

Thank you both for the help.

Point-Seven-five · 10 Re: My 1985 K100 now after much work. Thu Apr 14, 2022 3:33 pm

Point-Seven-five

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Jack up the bike so the front wheel is off the ground. Grab the wheel at the 6 and 12 o'clock positions and shake it to see if the wheel bearings are loose.

Spin the front wheel and watch for any wobble in the brake rotors.

Turn the handlebars from side to side feeling for any free play or notchiness.

Finally, take the front wheel off and have the balance checked. You would not be the first person to have a wheel weight or two come off the wheel.

Check all the fasteners on the forks for snugness. Then, you might want to loosen them all and go back and tighten them in sequence to remove any front end stiction.

fishboy316 · 11 Re: My 1985 K100 now after much work. Thu Apr 14, 2022 3:48 pm

fishboy316

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Thanks for the reply .75. I will do that after working at the bicycle shop this evening.

Bill

Laitch · 12 Re: My 1985 K100 now after much work. Thu Apr 14, 2022 10:09 pm

Laitch

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fishboy316 wrote:What are the optimum size Tire for a K100?

The OEM sizes should work well enough but there are successful alternatives and a site search will turn them up. Here's an owner's handbook from late 1984 to look up specs.

fishboy316 · 13 Re: My 1985 K100 now after much work. Fri Apr 15, 2022 7:54 am

fishboy316

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Thank you for the Information! Lots of good stuff in the book.

Thanks again!
Bill

fishboy316 · 14 Re: My 1985 K100 now after much work. Sat Apr 16, 2022 8:05 am

fishboy316

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Read some of the posts after a search. I changed the tire pressure from 36 to 39 in the rear and 34 to 36 in the front. Was a great improvement. Was much better handling. Now when I get rid of the pulsing I will put new tires on the beast. I have to work all weekend so won't be digging in to deep yet.

Took her to church with me last night for Good Friday services and showed her off. She got awesome reviews! Smile

Thanks for all the suggestions!
Bill

moriarti · 15 Re: My 1985 K100 now after much work. Sat Apr 16, 2022 10:04 am

moriarti

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fishboy316 wrote:Read some of the posts after a search. I changed the tire pressure from 36 to 39 in the rear and 34 to 36 in the front. Was a great improvement. Was much better handling. Now when I get rid of the pulsing I will put new tires on the beast. I have to work all weekend so won't be digging in to deep yet.

Took her to church with me last night for Good Friday services and showed her off. She got awesome reviews!

Thanks for all the suggestions!
Bill

On MY Bridgestone tyres, i run at FRONT 38psi REAR 42psi Rides well for me, at 10st 7lbs My 1985 K100 now after much work. 652573

Point-Seven-five · 16 Re: My 1985 K100 now after much work. Sat Apr 16, 2022 10:13 am

Point-Seven-five

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Yeah, 38F and 42R are the internationally recommended pressures for brick tires. They seem to work on all models, with all tire sizes, in many weather conditions and riding environments all over the world.

fishboy316 · 17 Re: My 1985 K100 now after much work. Sat Apr 16, 2022 11:34 am

fishboy316

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Anyone here ever use Dunlop 404 tires?
Thanks

Laitch · 18 Re: My 1985 K100 now after much work. Sat Apr 16, 2022 12:43 pm

Laitch

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fishboy316 wrote:Anyone here ever use Dunlop 404 tires?

The leading comment here seems to sum up the outlook on 404s. Smile

Dai · 19 Re: My 1985 K100 now after much work. Sat Apr 16, 2022 1:54 pm

Dai

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fishboy316 · 20 Re: My 1985 K100 now after much work. Sat Apr 16, 2022 2:41 pm

fishboy316

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Guess that settles that! My 1985 K100 now after much work. 44271

fishboy316 · 21 Re: My 1985 K100 now after much work. Sat Apr 16, 2022 3:29 pm

fishboy316

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Ok increase in budget. Have anyof you run the Bridgestone Pneu battlax BT46? They have good reviews and they have the size I need.
Olaf says they are great!
I am ordering them.

moriarti · 22 Re: My 1985 K100 now after much work. Sat Apr 16, 2022 5:38 pm

moriarti

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fishboy316 wrote:Ok increase in budget. Have anyof you run the Bridgestone Pneu battlax BT46? They have good reviews and they have the size I need.
Olaf says they are great!
I am ordering them.

That's my Tyre of choice Very Happy

Dai · 23 Re: My 1985 K100 now after much work. Sat Apr 16, 2022 8:00 pm

Dai

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Nah. Avon Roadrider IIs.

fishboy316 · 24 Re: My 1985 K100 now after much work. Sat Apr 16, 2022 9:56 pm

fishboy316

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I have been riding it around a good bit. It is really starting to impress me a good bit. A very fun bike. Will be glad to get new tires on it.
Will be exciting to have some new adventures on it.
Thanks again for the information folks.

Bill

Point-Seven-five · 25 Re: My 1985 K100 now after much work. Sat Apr 16, 2022 10:52 pm

Point-Seven-five

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If you are on a tight budget and not into dragging the pegs in the rain you may find that Shinko Tourmaster or 712's are a good choice. If you can do your own tire changes you can get a set(front and rear) from Chaparral Motor Sports for less than $200.

I have run 8 sets of Shinkos on four bikes for a total of over 65,000 miles with no complaints. For the money, I think they are the best bargain in tires if you aren't a tire snob. They handle well in wet or dry and have good longevity, easily running 8-9,000 miles on the rear and 12,000 on the front.

fishboy316 · 26 Re: My 1985 K100 now after much work. Wed Apr 20, 2022 9:15 am

fishboy316

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Looks like the pulsating brakes was the rotors. Swapped the front wheel last night and now they are smooth as silk! Was going to replace the Pads but the ones on it are close to brand new. I have a brand new set of EBC pads but as long as the ones on it are smooth and not causing any issues think I will keep them on for now. Are the Y rims tubeless or do they need tubes? My tires should be here any day and want to be ready to have them mounted.

THANKS
Bill

Last edited by fishboy316 on Wed Apr 20, 2022 10:42 am; edited 1 time in total

Rick G · 27 Re: My 1985 K100 now after much work. Wed Apr 20, 2022 9:37 am

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They are tubeless

92KK 84WW Olaf · 28 Re: My 1985 K100 now after much work. Wed Apr 20, 2022 11:50 am

92KK 84WW Olaf

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I am happy to drag the pegs in the rain and had some quite spirited riding on the RS at the weekend . . . . . with the trailer on. I like my Battlax BT46, great in the rain.

fishboy316 · 29 Re: My 1985 K100 now after much work. Wed Apr 20, 2022 2:36 pm

fishboy316

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I am going to see how I like them. The rear was delivered today. Don't think I am ready to start "peg draggin" yet though. Been a while since I was there.

lomcevok · 30 What Color! Wed Apr 20, 2022 7:47 pm

lomcevok

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fishboy316 wrote:
https://servimg.com/view/20418063/11
https://servimg.com/view/20418063/7
After many hours this bike is pretty sweet. Love the way it rides. Love the way it looks. Hate the center stand! Still working on the pulsating in the front brakes. That one is kicking my butt. All in all I will have $1500 into so far(I stress "so far). Not bad for a quality bike.

Fishboy: I too am working up a K100 - Mine's in RT dress, 20+ years in a barn, mostly in tact, runs great.

However, it's blue. I like RED. What color is your bike? Factory color or something after the fact[ory]?

Bill

... and a postscript - your comment about the low speed handling is familiar. Mine, having sat for 20+, had dried out the steering head grease. The bearing felt "worn-in" with what felt like detents.

But, while a PITA to fix, the bearings were undamaged, and a good cleaning and greasing totally fixed the chunky handling. Hardest part was finding a socket big enough to loosen the big nut.

fishboy316 · 31 Re: My 1985 K100 now after much work. Thu Apr 21, 2022 9:52 am

fishboy316

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Hello lomcevok,
The bike has been repainted from Alaskan Blue to this red. The PO said it was called Porsche Red.
I like the red also. That being said the blue isn't bad either.

My problem was a terrible pulsating in the front brakes. I have replaced the wheel with a spare I had. The rotors only had about 10,000 miles on them. Became smooth as silk.

Next decision is weather to go tubeless with the new tires or not. I am no peg dragger by any means so not sure it really matters. I have read about issues both ways.

Good luck on the build! Lets see some pics.

lomcevok · 32 Pics... Thu Apr 21, 2022 10:12 am

lomcevok

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fishboy316 wrote:Hello lomcevok,
The bike has been repainted from Alaskan Blue to this red. The PO said it was called Porsche Red.
I like the red also. That being said the blue isn't bad either.

My problem was a terrible pulsating in the front brakes. I have replaced the wheel with a spare I had. The rotors only had about 10,000 miles on them. Became smooth as silk.

Next decision is weather to go tubeless with the new tires or not. I am no peg dragger by any means so not sure it really matters. I have read about issues both ways.

Good luck on the build! Lets see some pics.

Will do. Regarding "porsche red" - I'll bet that's "Porsche Guards Red", the same red as an airplane I helped rebuild - "Big Red" it was named.... favorite color!

Glad you skinned the pulsating. My tires are very old - what was found on the bike. No checking, no wobbles, and no confidence. Let me know what brand you put on front - will probably change mine before riding it much

Bill

Laitch · 33 Re: My 1985 K100 now after much work. Thu Apr 21, 2022 11:02 am

Laitch

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fishboy316 wrote:Next decision is weather to go tubeless with the new tires or not.

Why would you want to use a tube in a new tubeless tire on your Brick's rims?

moriarti · 34 Re: My 1985 K100 now after much work. Thu Apr 21, 2022 11:51 am

moriarti

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Many years ago i had a total deflate of the rear tyre ,Instant cure for Hameroyds. Since that time iv had Puncture proof product added and to good effect, saved me on a couple of occasions well worth the money Very Happy

fishboy316 · 35 Re: My 1985 K100 now after much work. Thu Apr 21, 2022 12:11 pm

fishboy316

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What product did you use?

fishboy316 · 36 Re: My 1985 K100 now after much work. Thu Apr 21, 2022 12:20 pm

fishboy316

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Laitch wrote:

fishboy316 wrote:Next decision is weather to go tubeless with the new tires or not.

Why would you want to use a tube in a new tubeless tire on your Brick's rims?

This is the first BMW product I have owned. Not familiar wit all the aspects of the machine yet. I read some stuff about bead separation on the snowflake rim. Read a little more today that is saying that the rims were early where the incidents occured. I probably won't use tubes but was looking at what I can find on the subject. I also ride Bicycles and all of my modern bikes are tubeless. I do get the benefits of tubeless.

moriarti · 37 Re: My 1985 K100 now after much work. Fri Apr 22, 2022 6:25 am

moriarti

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fishboy316 wrote: What product did you use?

Ask at your local tyre man, lots of brand names out there.

fishboy316 · 38 Re: My 1985 K100 now after much work. Fri Apr 22, 2022 9:08 pm

fishboy316

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She went through the Maryland state safety inspection today with flying colors. All legal and ready to roll. Getting my Batlax BT46's installed on Tuesday. Should be about it for now. My 1985 K100 now after much work. 212902

My 1985 K100 now after much work. 212902

(I hope).

Thanks for all the help Folks!
Bill

Dai · 39 Re: My 1985 K100 now after much work. Sat Apr 23, 2022 7:28 am

Dai

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Oh good! When I lived in Kentucky 'bout twenty years ago, they'd never heard of the words 'safety inpection'. No state transfer inspection, no nothing. Just re-reg. Some interesting vehicles on the road....

fishboy316 · 40 Re: My 1985 K100 now after much work. Sat Apr 23, 2022 8:50 am

fishboy316

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Well they have figured out that folks will die in some of those things. Still see some pretty crazy things out there though. Maryland has one of the toughest inspections around. Was a little worried about it but after due diligence she went right through! Am very happy with the bike at this point. Still under 2k on it.

Bill

Laitch · 41 Re: My 1985 K100 now after much work. Sat Apr 23, 2022 10:34 am

Laitch

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Dai wrote:When I lived in Kentucky . . . No state transfer inspection, no nothing. Just re-reg. Some interesting vehicles on the road....

fishboy316 wrote:Well they have figured out that folks will die in some of those things.

Many states still don't have inspection and the disappointing news, fishboy, is that some folks will die on a thing like yours, regardless of its mechanical condition. Sad

fishboy316 · 42 Re: My 1985 K100 now after much work. Sun Apr 24, 2022 8:55 am

fishboy316

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Yes That is a risk that you know when you throw a leg over one of these machines. I rode for 35 years and went down a couple of times. I will say that if by making it mechanically sound I can lower the risk I am for it. Batlax BT46's going on on tuesday. The old tires passed but I don't trust them. It has actually been kinda fun getting to know the machine a bit. She is a pretty well behaved machine and I am having an interesting time so far.

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1 My 1985 K100 now after much work. Wed Apr 13, 2022 8:02 am

fishboy316

2 Re: My 1985 K100 now after much work. Wed Apr 13, 2022 11:51 am

moriarti

3 Re: My 1985 K100 now after much work. Wed Apr 13, 2022 1:37 pm

Arlina

4 Re: My 1985 K100 now after much work. Thu Apr 14, 2022 7:51 am

fishboy316

5 Re: My 1985 K100 now after much work. Thu Apr 14, 2022 10:28 am

moriarti

6 Re: My 1985 K100 now after much work. Thu Apr 14, 2022 12:56 pm

fishboy316

7 Re: My 1985 K100 now after much work. Thu Apr 14, 2022 1:30 pm

92KK 84WW Olaf

8 Re: My 1985 K100 now after much work. Thu Apr 14, 2022 1:43 pm

moriarti

9 Re: My 1985 K100 now after much work. Thu Apr 14, 2022 2:45 pm

fishboy316

10 Re: My 1985 K100 now after much work. Thu Apr 14, 2022 3:33 pm

Point-Seven-five

11 Re: My 1985 K100 now after much work. Thu Apr 14, 2022 3:48 pm

fishboy316

12 Re: My 1985 K100 now after much work. Thu Apr 14, 2022 10:09 pm

Laitch

13 Re: My 1985 K100 now after much work. Fri Apr 15, 2022 7:54 am

fishboy316

14 Re: My 1985 K100 now after much work. Sat Apr 16, 2022 8:05 am

fishboy316

15 Re: My 1985 K100 now after much work. Sat Apr 16, 2022 10:04 am

moriarti

16 Re: My 1985 K100 now after much work. Sat Apr 16, 2022 10:13 am

Point-Seven-five

17 Re: My 1985 K100 now after much work. Sat Apr 16, 2022 11:34 am

fishboy316

18 Re: My 1985 K100 now after much work. Sat Apr 16, 2022 12:43 pm

Laitch

19 Re: My 1985 K100 now after much work. Sat Apr 16, 2022 1:54 pm

Dai

20 Re: My 1985 K100 now after much work. Sat Apr 16, 2022 2:41 pm

fishboy316

21 Re: My 1985 K100 now after much work. Sat Apr 16, 2022 3:29 pm

fishboy316

22 Re: My 1985 K100 now after much work. Sat Apr 16, 2022 5:38 pm

moriarti

23 Re: My 1985 K100 now after much work. Sat Apr 16, 2022 8:00 pm

Dai

24 Re: My 1985 K100 now after much work. Sat Apr 16, 2022 9:56 pm

fishboy316

25 Re: My 1985 K100 now after much work. Sat Apr 16, 2022 10:52 pm

Point-Seven-five

26 Re: My 1985 K100 now after much work. Wed Apr 20, 2022 9:15 am

fishboy316

27 Re: My 1985 K100 now after much work. Wed Apr 20, 2022 9:37 am

Rick G

28 Re: My 1985 K100 now after much work. Wed Apr 20, 2022 11:50 am

92KK 84WW Olaf

29 Re: My 1985 K100 now after much work. Wed Apr 20, 2022 2:36 pm

fishboy316

30 What Color! Wed Apr 20, 2022 7:47 pm

lomcevok

31 Re: My 1985 K100 now after much work. Thu Apr 21, 2022 9:52 am

fishboy316

32 Pics... Thu Apr 21, 2022 10:12 am

lomcevok

33 Re: My 1985 K100 now after much work. Thu Apr 21, 2022 11:02 am

Laitch

34 Re: My 1985 K100 now after much work. Thu Apr 21, 2022 11:51 am

moriarti

35 Re: My 1985 K100 now after much work. Thu Apr 21, 2022 12:11 pm

fishboy316

36 Re: My 1985 K100 now after much work. Thu Apr 21, 2022 12:20 pm

fishboy316

37 Re: My 1985 K100 now after much work. Fri Apr 22, 2022 6:25 am

moriarti

38 Re: My 1985 K100 now after much work. Fri Apr 22, 2022 9:08 pm

fishboy316

39 Re: My 1985 K100 now after much work. Sat Apr 23, 2022 7:28 am

Dai

40 Re: My 1985 K100 now after much work. Sat Apr 23, 2022 8:50 am

fishboy316