BMW K bikes (Bricks)


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1Back to top Go down   You get what you pay for. Empty You get what you pay for. Sun May 05, 2024 1:47 pm

Ballzac

Ballzac
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So I picked up a 86' k100rs from a retired college professor for 250. I was shocked at the price so I proceeded to ask what was wrong with it. First off no title, bummer but that's okay, then he said other than that nothing. Was running before he started the dismantling process before covid happened and he shelfed the project when he got to electrical because it was too complicated for him. The bike was his brother's from PA  and he drove it to his house in Princeton in 2020 before half getting it to a scrambler. 

Fast forward 3 years I purchase said bike with plans on making it into a cafe. I am excited tearing it down in preparation for repaint since I don't trust said professor used the right kind of paint and want to replace the hardware and gaskets with all new or at least clean what I can. Everything comes off, everything looks good till I get to the crank case and find a very tragic site, at least that's what I currently am thinking. There was no fluid in the bike for god knows how long, there was a mouse making my engine it's living room. Definitely wont be giving this dude a cookie... So my question is, what the hell do I do? I am already out of my dept here just reading and researching what I can do get this bike to where I want and now I guess I have to tear apart and rebuild the engine? Any advice would be appreciated  scratch

https://i.servimg.com/u/f60/20/56/25/21/img_5310.jpg

    

2Back to top Go down   You get what you pay for. Empty Re: You get what you pay for. Sun May 05, 2024 2:06 pm

Two Wheels Better

Two Wheels Better
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You get what you pay for. Img_5311
There, I made the image visible for you. It does not look good. A teardown and thorough inspection is in order.


It's '86, not 86', BTW. You're removing the 19 to make the contraction, so the apostrophe goes before the numbers to indicate removal. Otherwise you're describing an 86' (foot long) K100RS. A too common mistake that many make.


__________________________________________________
"A long ride is the answer to a question you will soon forget!" ~ Anonymous
1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT
    

3Back to top Go down   You get what you pay for. Empty My bad Sun May 05, 2024 2:29 pm

Ballzac

Ballzac
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Two Wheels Better wrote:You get what you pay for. Img_5311
There, I made the image visible for you. It does not look good. A teardown and thorough inspection is in order.


It's '86, not 86', BTW. You're removing the 19 to make the contraction, so the apostrophe goes before the numbers to indicate removal. Otherwise you're describing an 86' (foot long) K100RS. A too common mistake that many make.
Thank you! Appreciate the knowledge.

    

4Back to top Go down   You get what you pay for. Empty Re: You get what you pay for. Sun May 05, 2024 2:33 pm

Two Wheels Better

Two Wheels Better
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These engines are quite robust, and as long as it was not submerged in flood water, might only require a look-see & clean up to rectify the rust & corrosion issue. It could be a fun project, and it would seem you have not invested a lot of dosh into it so far. I say let it live!


__________________________________________________
"A long ride is the answer to a question you will soon forget!" ~ Anonymous
1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT
    

5Back to top Go down   You get what you pay for. Empty You get what you pay for. Sun May 05, 2024 2:37 pm

Ballzac

Ballzac
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I think I am gonna try and give it a go, I have the manual and if I can come across someone else doing it I think I will be in good shape. I was told as long as there is not much pitting I might be okay  Question

    

6Back to top Go down   You get what you pay for. Empty Re: You get what you pay for. Sun May 05, 2024 2:45 pm

bad boy

bad boy
Life time member
Life time member
Ballzac

I do feel your disappointment.
You never know what you've bought until tearing it apart.

My Ecomobile has the third engine right now. Here's the story:

As I bought it, I was the third owner and the service history of the vehicle was unknown. The original engine was running fine, but guzzling engine oil like a two stroke engine. It was decided to have it replaced, as the costs of rebuilding would very probably be higher than a used second hand one.

The second engine had a damaged crankshaft and worn crankshaft bearings. I've bought that one second hand from the internet. The seller was unknown to me and I only found out after having it installed and running. That one was replaced as well.

The actual engine is w/o any fault and running strong. It was bought second hand as well, but from a very reliable source.

So my advice is:
Maybe buying and installing a used engine from a reliable source could save you the trouble and costs of having this one torn apart and being rebuilt.

PS
Unless you do have the knowledge and possibilities to do the job yourself. That would be a different story then.


__________________________________________________
Cheerz, David

You get what you pay for. 9438-010

____________________________________________________________________________
1997 Peraves Super Ecomobile: a Kevlar reinforced monocoque with outrigger wheels, seating two.
K75 fork, K100 monolever, headlight, indicators, K1100RS gearbox, K1200RS 589 instrument cluster, engine, rear wheel
    

7Back to top Go down   You get what you pay for. Empty Re: You get what you pay for. Sun May 05, 2024 5:34 pm

Dai

Dai
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It's a bit of a toss-up really - as long as you don't use a double-headed nickel. A known working engine from a reputable breakers could actually cost less than rebuilding that one. I'd want to inspect the camshaft, cylinders and big-end bearings before making a final decision. Rust in the cylinders would make me start to think seriously about looking for another engine. So, in order I'd

- check the camshaft for pitting and rust. Get a manual and check the cam follower gaps before pulling the camshaft
- if the camshaft is okay, pull the cylinder head and check the bores. One of them camera thingies you poke into dark corners isn't going to give enough information, even if it is a colour one (full disclosure: I have a high-end Bosch one with a colour camera and it's bloody useless for looking down cylinders unless there's a sodding great hole in the piston)
- if the bores are okay, check the big-end journals

If the journals are okay, start adding up the cost of new parts. At the very least you will need:

- a full gasket set
- a new set of big-end bolts (do NOT reuse the old ones because they are a stretch-fit)
- possibly all of the engine rubber parts (inlet rubbers, manifold rubbers, crankcase breather hose)
- air filter. Bet the mouse has had a high old time making a nest from that
- if you took the gearbox off and didn't secure the clutch arm first, you've probably ripped the clutch boot. We've all done it, some of us have done it multiple times

affraid I think I've finished scaring you for today. Come back tomorrow if that's not enough in the fear department.


__________________________________________________
1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

8Back to top Go down   You get what you pay for. Empty Re: You get what you pay for. Sun May 05, 2024 6:43 pm

Ballzac

Ballzac
active member
active member
bad boy wrote:Ballzac

I do feel your disappointment.
You never know what you've bought until tearing it apart.

My Ecomobile has the third engine right now. Here's the story:

As I bought it, I was the third owner and the service history of the vehicle was unknown. The original engine was running fine, but guzzling engine oil like a two stroke engine. It was decided to have it replaced, as the costs of rebuilding would very probably be higher than a used second hand one.

The second engine had a damaged crankshaft and worn crankshaft bearings. I've bought that one second hand from the internet. The seller was unknown to me and I only found out after having it installed and running. That one was replaced as well.

The actual engine is w/o any fault and running strong. It was bought second hand as well, but from a very reliable source.

So my advice is:
Maybe buying and installing a used engine from a reliable source could save you the trouble and costs of having this one torn apart and being rebuilt.

PS
Unless you do have the knowledge and possibilities to do the job yourself. That would be a different story then.
Just looking into everything as is without knowing how much rust is in there as of now looks like I'm  going to be spending close to the same regardless. If I were to purchase a used engine from a reputable site then that runs me 1600 but if I send them my engine I get some off as well. The rusting on the crank shaft looks pretty rough and might actually have some pitting so I am not looking too hopeful.

    

9Back to top Go down   You get what you pay for. Empty Re: You get what you pay for. Sun May 05, 2024 6:46 pm

Ballzac

Ballzac
active member
active member
Dai wrote:It's a bit of a toss-up really - as long as you don't use a double-headed nickel. A known working engine from a reputable breakers could actually cost less than rebuilding that one. I'd want to inspect the camshaft, cylinders and big-end bearings before making a final decision. Rust in the cylinders would make me start to think seriously about looking for another engine. So, in order I'd

- check the camshaft for pitting and rust. Get a manual and check the cam follower gaps before pulling the camshaft
- if the camshaft is okay, pull the cylinder head and check the bores. One of them camera thingies you poke into dark corners isn't going to give enough information, even if it is a colour one (full disclosure: I have a high-end Bosch one with a colour camera and it's bloody useless for looking down cylinders unless there's a sodding great hole in the piston)
- if the bores are okay, check the big-end journals

If the journals are okay, start adding up the cost of new parts. At the very least you will need:

- a full gasket set
- a new set of big-end bolts (do NOT reuse the old ones because they are a stretch-fit)
- possibly all of the engine rubber parts (inlet rubbers, manifold rubbers, crankcase breather hose)
- air filter. Bet the mouse has had a high old time making a nest from that
- if you took the gearbox off and didn't secure the clutch arm first, you've probably ripped the clutch boot. We've all done it, some of us have done it multiple times

affraid I think I've finished scaring you for today. Come back tomorrow if that's not enough in the fear department.
I got a quote from a local guy who does full engine rebuilds and he says he is looking anywhere from 3k-4k without parts so I think I am going to order a rebuilt engine from BSK Speedworks. They seem pretty fair and even give you a warranty. Hell, might even speed up my timeline to when I could get the piglet up and running. I will do my best to keep everyone updated, thank you guys for the advice and knowledge.

    

10Back to top Go down   You get what you pay for. Empty Re: You get what you pay for. Sun May 05, 2024 7:08 pm

duck

duck
Life time member
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Swapping in another K75 engine is the way to go.

Be sure to get model year 1989 or later as 88 and earlier have the smoky rings.

Here's one in PA for $499 but you have to pick it up because I guess that the seller is too lazy to ship.
http://www.ebay.com/itm/143777171130

(I wouldn't pay that much though.)

For $3-4K to do a rebuild you could find a whole nice running bike.

Alternately, you could just buy another whole k75 to cafe and use the untitled $250 bike as a parts bike. That's what I'd do.



Last edited by duck on Sun May 05, 2024 7:18 pm; edited 1 time in total


__________________________________________________
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
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

11Back to top Go down   You get what you pay for. Empty Re: You get what you pay for. Sun May 05, 2024 7:16 pm

duck

duck
Life time member
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Two Wheels Better wrote:It's '86, not 86', BTW. You're removing the 19 to make the contraction, so the apostrophe goes before the numbers to indicate removal. Otherwise you're describing an 86' (foot long) K100RS. A too common mistake that many make.

This a motorcycle forum, not a grammar Nazi forum. lol!


__________________________________________________
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
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

12Back to top Go down   You get what you pay for. Empty Re: You get what you pay for. Sun May 05, 2024 7:26 pm

Two Wheels Better

Two Wheels Better
Moderator
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Beauty IS in the details, and a K75 engine would be less than in an '86 K100.  Cool


__________________________________________________
"A long ride is the answer to a question you will soon forget!" ~ Anonymous
1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT
    

13Back to top Go down   You get what you pay for. Empty Re: You get what you pay for. Sun May 05, 2024 8:18 pm

Ballzac

Ballzac
active member
active member
I've looked on Ebay for replacement engines, there is a couple of them but I don't know what I will be getting which would/could potentially put me in the same situation that I am in now. I found a pretty reputable site but still waiting for an exact number from them.

    

14Back to top Go down   You get what you pay for. Empty Re: You get what you pay for. Sun May 05, 2024 8:53 pm

duck

duck
Life time member
Life time member
I know where you can probably get one from a very reputable source but he's in Long Beach, CA and it'd need to be shipped across the country.

Let me know if interested and I can hook you up.


__________________________________________________
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
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

15Back to top Go down   You get what you pay for. Empty You gets what you pay for Sun May 05, 2024 9:22 pm

daveyson

daveyson
Life time member
Life time member
Another option, clean it as best you can, without dismantling, a bit of lube, and give it a go. If it really has sat for only three years, that's not bad. Most of the important bits are made from non rusty stuff. Bricks withstand a lot of abuse. Compressed air helps.


__________________________________________________
11/1985 BMW K100RT (late model)  Vin. 0090567
 ~120,000 km
    

16Back to top Go down   You get what you pay for. Empty Re: You get what you pay for. Sun May 05, 2024 11:09 pm

duck

duck
Life time member
Life time member
That's crazy that it is so corroded inside after only a few years. Even if there had been fluids in it, if it's never run that shouldn't matter because the oil never circulates in a non-run engine but there should still be some residual oil film left on the parts.

I once bought a boatload of K stuff from a local dude who was moving and needed it all of his K stuff gone for $200. It was one of those "you have to take it all" deals so I got most of a rollable an 85 K100RS(sans fairing), an 86 K75 motor and several boxes of miscellaneous K parts. Anyhow, the 86 K75 motor then sat in my basement for another several years until I finally decided to turn it into my K75 Frankenbrick.

Being a big believer in blind faith, I just figured that it was still good and started building a bike around it. The thought of taking either the valve or crank covers off of it or doing any of the stuff the Laitch recommends never even occurred to me. All that I did was use use refurb'd fuel injectors and a clean fuel rail.

Once I had the wiring harnesses and a frame installed I'll be damned if it didn't start right up once I put a battery in it. I even did that on the old oil that was in it because I only ran for it a minute just to make sure that it would start and run.

I did eventually check the valves and along with a few different fairing iterations but it ended up going from this to this:

Before:

You get what you pay for. K75f_003

After:
You get what you pay for. K75f_810_hurricane_ridge

It's been a very reliable K75 and I still have no idea what it looks like under the crank cover.

My only regret is that I built it around a smoky 86 engine but I do have a 60K 94 engine to replace it with if I ever get motivated enough.


__________________________________________________
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
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

17Back to top Go down   You get what you pay for. Empty Re: You get what you pay for. Mon May 06, 2024 2:18 am

jbt

jbt
Life time member
Life time member
Very strange view inside this engine. It looks like it's coated with a mix of never-drained burnt oil and coolant.
When I find such a mess when opening a case, I just spare the ignition system and throw all the rest.


__________________________________________________
Let us enjoy the transient delight
That fills our fairest day.
    

18Back to top Go down   You get what you pay for. Empty Re: You get what you pay for. Mon May 06, 2024 6:54 am

caveman

caveman
Life time member
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Ballzac,

I have a '88lt that runs fine. Son dropped it on both sides so fairing is messed up bad. It has a good title and could be had at a reasonable price. Shoot me a PM if interested.

PS, Did that bike come from State Collage?

    

19Back to top Go down   You get what you pay for. Empty Re: You get what you pay for. Mon May 06, 2024 8:15 pm

Ballzac

Ballzac
active member
active member
duck wrote:That's crazy that it is so corroded inside after only a few years. Even if there had been fluids in it, if it's never run that shouldn't matter because the oil never circulates in a non-run engine but there should still be some residual oil film left on the parts.

I once bought a boatload of K stuff from a local dude who was moving and needed it all of his K stuff gone for $200. It was one of those "you have to take it all" deals so I got most of a rollable an 85 K100RS(sans fairing), an 86 K75 motor and several boxes of miscellaneous K parts. Anyhow, the 86 K75 motor then sat in my basement for another several years until I finally decided to turn it into my K75 Frankenbrick.

Being a big believer in blind faith, I just figured that it was still good and started building a bike around it. The thought of taking either the valve or crank covers off of it or doing any of the stuff the Laitch recommends never even occurred to me. All that I did was use use refurb'd fuel injectors and a clean fuel rail.

Once I had the wiring harnesses and a frame installed I'll be damned if it didn't start right up once I put a battery in it. I even did that on the old oil that was in it because I only ran for it a minute just to make sure that it would start and run.

I did eventually check the valves and along with a few different fairing iterations but it ended up going from this to this:

Before:

You get what you pay for. K75f_003

After:
You get what you pay for. K75f_810_hurricane_ridge

It's been a very reliable K75 and I still have no idea what it looks like under the crank cover.

My only regret is that I built it around a smoky 86 engine but I do have a 60K 94 engine to replace it with if I ever get motivated enough.
Gives me a little hope!

    

20Back to top Go down   You get what you pay for. Empty Re: You get what you pay for. Mon May 06, 2024 9:17 pm

Ballzac

Ballzac
active member
active member
daveyson wrote:Another option, clean it as best you can, without dismantling, a bit of lube, and give it a go. If it really has sat for only three years, that's not bad. Most of the important bits are made from non rusty stuff. Bricks withstand a lot of abuse. Compressed air helps.
I think after getting a few emails back from a couple of people this is my option I will be exploring this weekend. Going to be taking off everything I can without getting in too deep, WD40 everything, use some light rubbing with some emery cloth and hope for the best.

    

21Back to top Go down   You get what you pay for. Empty Re: You get what you pay for. Mon May 06, 2024 9:19 pm

Ballzac

Ballzac
active member
active member
caveman wrote:Ballzac,

I have a '88lt that runs fine. Son dropped it on both sides so fairing is messed up bad. It has a good title and could be had at a reasonable price. Shoot me a PM if interested.

PS, Did that bike come from State Collage
I did pick it up from the College yeah. I will let you know where I am at after this weekend, might take you up on it.

    

22Back to top Go down   You get what you pay for. Empty Re: You get what you pay for. Mon May 13, 2024 4:54 pm

Suzi Q

Suzi Q
Life time member
Life time member
 "if you took the gearbox off and didn't secure the clutch arm first, you've probably ripped the clutch boot. We've all done it, some of us have done it multiple times"


Oh yes. Oh yes yes yes  Crying or Very sad


__________________________________________________
Sometimes I'm not really Suzi Quatro.
    

23Back to top Go down   You get what you pay for. Empty Update Mon May 27, 2024 3:21 pm

Ballzac

Ballzac
active member
active member
So this weekend I finally got around to taking her apart and found even more bad news. The entire oil pan was filled with a rats nest You get what you pay for. 61740

BUT!!!! with the help of a good friend we just hunkered down and got to work with some light sanding and wire brushing using tons of WD40 and lots of brake cleaner. Used a rust remover for the pistons and it worked fairly well. Still have to somehow clean out the intake ports below the throttle body, that will be a later this week project. Any advice towards that would be appreciated.
You get what you pay for. 0?ui=2&ik=85c0d00480&attid=0.1You get what you pay for. 0?ui=2&ik=85c0d00480&attid=0.1You get what you pay for. 0?ui=2&ik=85c0d00480&attid=0.1

    

24Back to top Go down   You get what you pay for. Empty Re: You get what you pay for. Mon May 27, 2024 3:26 pm

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Perhaps THIS link will help you with successfully posting photos to the phorum. 
Exclamation


__________________________________________________
"A long ride is the answer to a question you will soon forget!" ~ Anonymous
1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT
    

25Back to top Go down   You get what you pay for. Empty Re: You get what you pay for. Mon May 27, 2024 4:14 pm

Ballzac

Ballzac
active member
active member
Two Wheels Better wrote:Perhaps THIS link will help you with successfully posting photos to the phorum. 
Exclamation
Are you unable to view the photos I have posted?

    

26Back to top Go down   You get what you pay for. Empty Re: You get what you pay for. Mon May 27, 2024 4:37 pm

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Ballzac wrote:
Two Wheels Better wrote:Perhaps THIS link will help you with successfully posting photos to the phorum. 
Exclamation
Are you unable to view the photos I have posted?
In your most recent post links appear but go nowhere.


__________________________________________________
"A long ride is the answer to a question you will soon forget!" ~ Anonymous
1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT
    

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