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1Back to top Go down   k75 pistons in k100 Empty k75 pistons in k100 Mon Feb 01, 2016 8:01 pm

jjs1234

jjs1234
active member
active member
Hey!

So before I begin my build thread I wanted to clear out some questions around this.


Since its possible, Ill undertake this challenge. I was planning to drop the engine and do all sorts of fun stuff to it, but I think I'll save that for another time and place.

I just want to get it running.

Anyway, my questions were:

I noticed on schematics that some parts have gaskets (Crankshaft cover, Valve covers [inner and outer], and the Cylinder head). What about the sump cover (as id like to take a look-see to see that everything is good) and timing-cover? Do I RTV these?


Any tips for this modification?


I was planning on buying new k75 pistons @ 60$ ea. (240$) with rings installed and a Main-Bearing set (142$).


Just wondering if I should take into account anything else? Tips? Chain-Timing?

Thanks for any wisdom provided  Very Happy


k75 pistons in k100 Th_Oil%20Pank75 pistons in k100 Th_Cylander%20Head%20Coverk75 pistons in k100 Th_Timing%20case%20coverk75 pistons in k100 Th_Cylander%20Headk75 pistons in k100 Th_Crankshaft%20Shellsk75 pistons in k100 Th_Crank%20Case%20Cover

    

2Back to top Go down   k75 pistons in k100 Empty Re: k75 pistons in k100 Mon Feb 01, 2016 8:40 pm

Rick G

Rick G
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The only real Gaskets are the head and small cover on the Hall sensors.  The crank and cam covers have neoprene reuseable seals and as for the rest BMW recommend 3 Bond but I use Permatex RTV Blue and have never had trouble.
BMW also recommend replacing the guides and tensioner on the timing chain but I have seen some engines with near 200K and the guides were OK. I would replace the guides and tensioner with what you intend to do as they do seem to get a bit brittle with age.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

3Back to top Go down   k75 pistons in k100 Empty Re: k75 pistons in k100 Mon Feb 01, 2016 8:57 pm

jjs1234

jjs1234
active member
active member
RicK G wrote:The only real Gaskets are the head and small cover on the Hall sensors.  The crank and cam covers have neoprene reuseable seals and as for the rest BMW recommend 3 Bond but I use Permatex RTV Blue and have never had trouble.
BMW also recommend replacing the guides and tensioner on the timing chain but I have seen some engines with near 200K and the guides were OK. I would replace the guides and tensioner with what you intend to do as they do seem to get a bit brittle with age.
Ya know whats crazy?

The tensioners alone are more expensive than the entire kit with the tensioners!! k75 pistons in k100 797640

I think I got Permatex Black. Any difference with the colors? 



Cool! Thanks for the advice. 

Im currently looking for info on how to re-align the Camshaft and the crankshaft. I plan on marking them with something white but... yeah.

    

4Back to top Go down   k75 pistons in k100 Empty Re: k75 pistons in k100 Mon Feb 01, 2016 9:59 pm

Rick G

Rick G
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The Black is OK and would probably do the job but the Blue will cop a lot more heat and has similar specs to the 3 Bond.

Best to put the whole kit in then.
Have you got a manual?


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

5Back to top Go down   k75 pistons in k100 Empty Re: k75 pistons in k100 Mon Feb 01, 2016 10:59 pm

duck

duck
Life time member
Life time member
I think I've used the Permatex Ultra Grey for the water pump and sump cover. No issues.


__________________________________________________
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
    

6Back to top Go down   k75 pistons in k100 Empty Re: k75 pistons in k100 Mon Feb 01, 2016 11:29 pm

jjs1234

jjs1234
active member
active member
Wow thought black was better... Well I got the receipt so I'll just exchange it.

As far as the manual goes, I've read one and it was the OEM manual. Didn't mention how to get it aligned though.


__________________________________________________
1984 K100
    

7Back to top Go down   k75 pistons in k100 Empty Re: k75 pistons in k100 Mon Feb 01, 2016 11:42 pm

duck

duck
Life time member
Life time member
Just my opinion but "best" is a relative term.  I think it's more binary - it either works or it doesn't. Your bike will not go faster with one or the other.


__________________________________________________
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
    

8Back to top Go down   k75 pistons in k100 Empty Re: k75 pistons in k100 Tue Feb 02, 2016 12:00 am

Rick G

Rick G
admin
admin
jjs1234 wrote:Wow thought black was better... Well I got the receipt so I'll just exchange it.

As far as the manual goes, I've read one and it was the OEM manual. Didn't mention how to get it aligned though.
Have a look at your PM there is a link


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

9Back to top Go down   k75 pistons in k100 Empty Re: k75 pistons in k100 Tue Feb 02, 2016 3:58 am

charlie99

charlie99
VIP
VIP
I have seen 2 versions  of the permatex black

one was cheaper than the other

the dearer one "ultra black " was qualified as very resistant to oil  ...in some places this would be an advantage

but generaly almost all the products will "do the job " ,,,if you don't over plaster the sealing surfaces ...making sure that they seem to seal well almost before any rtv is installed at all


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

10Back to top Go down   k75 pistons in k100 Empty Re: k75 pistons in k100 Tue Feb 02, 2016 3:49 pm

Kyle10

Kyle10
Life time member
Life time member
Here's some of the products and techniques I used for my bike's successful resuscitation: 

Products: 
BMW K100RS STAINLESS STEEL FASTENER KIT
Battery Cable Kit (4 Gauge) - BMW K
Premium Silicone Spark Plug Wire Set
- Clymer Manuals BMW K-Series 1985-1997 M500-3 (the best unless you're into forking out the dough for a mechanic's manual) 
GIBBS® penetrant: this is a restorer's best friend, ever. Will actually make castings look brand new. Amazing shtuff. Ebay or Amazon. 

Techniques/notes:
- Electrikery: check/replace every wire and ground. I swear the majority of elec. problems are simply poor grounds and rotten wires. 
- Mix 10% acetone with Marvel Mystery Oil for rejuvenating salvageable rubber pieces. A quick soak in a ziplock will amaze you. 
- Mix 50% ATF (automatic transmission fluid) with 50% acetone for the best penetrating oil you can obtain. Will get under rust and lift it from the surfaces, where you can wipe/lightly SOS-pad it away. 
- Inspect the rubber boots between the throttle bodies and the intake ports. If they're cracked you must replace them. Do not pass Go, do not collect $200 until you've done this, as your bike will never run properly with shite throttle boots. 
- Euro Motorelectrics is a great company; use them w/confidence.
- http://www.kbikeparts.com/ Seek the wisdom of the Duck; you'll never go wrong w/him. Pore through his many writings and be amazed at how granular this bast...guy gets in making things very, very Kool. 


A lot more to list and suggest, of course. Have fun; you have one of the most underrated bikes, ever. They really shine once they've been given some TLC.


__________________________________________________
1985 K100rt 0052183
1983 Honda VF750 007713 
    

11Back to top Go down   k75 pistons in k100 Empty Re: k75 pistons in k100 Wed Feb 03, 2016 12:09 am

duck

duck
Life time member
Life time member
My .02: Spend your money on radial tires. If you like to ride hard this is the best money you can spend.

Perhaps it's a bit of an exaggeration but radials will turn a Volkswagen into a Porsche.


__________________________________________________
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   k75 pistons in k100 Empty Re: k75 pistons in k100 Wed Feb 03, 2016 3:36 am

charlie99

charlie99
VIP
VIP
duck wrote:My .02: Spend your money on radial tires. If you like to ride hard this is the best money you can spend.

Perhaps it's a bit of an exaggeration but radials will turn a Volkswagen into a Porsche.
agree ...on an rs version




the seating and geometrics of an lt - rt are very different ...still love the good- best aggressive   versions of crossply tyres on an rt-lt  type narrow rim situation ...unless you can upgrade to wider rims and paralever rear end on the rt- lt 8valves  then you will see a vast difference


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

13Back to top Go down   k75 pistons in k100 Empty Re: k75 pistons in k100 Wed Feb 03, 2016 3:39 am

indian036

indian036
Life time member
Life time member
duck wrote:My .02: Spend your money on radial tires. If you like to ride hard this is the best money you can spend.

Perhaps it's a bit of an exaggeration but radials will turn a Volkswagen into a Porsche.
I'd love to try radials on my '85 K100, but it seems they are like rocking horse poo.

My then fiancé's VW 1200 with cross ply tyres used to do instant lane changes on the Harbour Bridge with a bit of breeze. Even retread radials made a massive difference. Didn't help the power output though. Smile

Bill


__________________________________________________
1985 K100RT  VIN 0028991  My original Very Happy ROB the Red Old Bike   (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  Tom the Triple (now on Historic rego too.)
    

14Back to top Go down   k75 pistons in k100 Empty Re: k75 pistons in k100 Wed Feb 03, 2016 3:46 am

Rick G

Rick G
admin
admin
Didn't help the power output though. huh


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

15Back to top Go down   k75 pistons in k100 Empty Re: k75 pistons in k100 Wed Feb 03, 2016 5:18 am

92KK 84WW Olaf

avatar
Life time member
Life time member
duck wrote:My .02: Spend your money on radial tires. If you like to ride hard this is the best money you can spend.

Perhaps it's a bit of an exaggeration but radials will turn a Volkswagen into a Porsche.

Isn't a Porsche a Beetle on steroids, just 2 extra pots in the back but underneath the same principle?

On the tyres I think of the CB500-4 and the tyres available at the time meant it took work to pull it down into corners on rural roads. It was a pleasure but it took concentration and it always felt like the bike was drifting sideways off line as if the tyres were creeping a little, even with the then Avon Roadrunners.

The K100RT and K100LT however by comparison seem to fall into corners much better and in my case the RT is better on this than the LT. I had the opportunity of a ride on a stock CB500-4 not so long back and it was still the same and not a case of memory nostalgia. I have tried both RT and LT on BT45 after removing the tyres they came on and even that showed an improvement on tyre change alone


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 48,061 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 61,190 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

16Back to top Go down   k75 pistons in k100 Empty Re: k75 pistons in k100 Wed Feb 03, 2016 8:57 am

duck

duck
Life time member
Life time member
charlie99 wrote:
duck wrote:My .02: Spend your money on radial tires. If you like to ride hard this is the best money you can spend.

Perhaps it's a bit of an exaggeration but radials will turn a Volkswagen into a Porsche.
agree ...on an rs version




the seating and geometrics of an lt - rt are very different ...still love the good- best aggressive   versions of crossply tyres on an rt-lt  type narrow rim situation ...unless you can upgrade to wider rims and paralever rear end on the rt- lt 8valves  then you will see a vast difference

On my 93 K1100LT switching from bias ply to radials made a WORLD of difference, no more of the wandering feeling on 90 MPH sweepers, MUCH more planted. Also much better handling when really leaned over.

I wouldn't put awider rim on the front of a 2V K, would make the front end less responsive. Not to mention that the extra weight would slow the bike down, both to spin up heavier rims and overall weight.


__________________________________________________
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   k75 pistons in k100 Empty Re: k75 pistons in k100 Wed Feb 03, 2016 9:23 am

Holister

Holister
Life time member
Life time member
Greater flexibility in a radial which takes up the unevenness of the road surface better than a cross-ply. Larger contact patch also gives better grip and greater stability giving more control to the rider. Pity there are no more decent radials available for the snow-flake rear wheel.


__________________________________________________

1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
 k75 pistons in k100 Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

18Back to top Go down   k75 pistons in k100 Empty Re: k75 pistons in k100 Wed Feb 03, 2016 10:11 am

Kyle10

Kyle10
Life time member
Life time member
duck wrote:My .02: Spend your money on radial tires. If you like to ride hard this is the best money you can spend.

Perhaps it's a bit of an exaggeration but radials will turn a Volkswagen into a Porsche.
Hey Duck, 
I know it's somewhere, but can you post your radial 'table' or point the way?


__________________________________________________
1985 K100rt 0052183
1983 Honda VF750 007713 
    

19Back to top Go down   k75 pistons in k100 Empty Re: k75 pistons in k100 Wed Feb 03, 2016 10:49 am

charlie99

charlie99
VIP
VIP
k 1100 lt had rear 3 inch already  and they defiantly feel different than a 8 valve In many respects,  front shocks to start with and paralever rear  but I take your point on that one .


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

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