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Author Topic: Supping up the 740cc on my K75S  (Read 10209 times)

Offline Devil K

  • Motobrick Curious
  • Posts: 40
Supping up the 740cc on my K75S
« on: May 04, 2016, 08:14:06 PM »
Is it possible to push these brick motors even further, because I mean now my bike is nothing special it'll hit around 100-120, so what I'm asking is do they make performance parts for this bike so that it will hit a "ton and a half"?
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  • Kernville
  • 1994 BMW K75S

Offline Chaos

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Re: Supping up the 740cc on my K75S
« Reply #1 on: May 04, 2016, 09:31:29 PM »
there used to be some turbo kits but good luck finding one now.  Not much in the hot rod department for bricks, I suppose you could add nitrous, much easier to move up to a K1200 or a crotch rocket.
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  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
sold 6/23
2023 Ural 2WD sidecar (BMW's bastard step child)

Offline F14CRAZY

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Re: Supping up the 740cc on my K75S
« Reply #2 on: May 04, 2016, 09:59:39 PM »
It seems like you would run out of gearing. I didn't make note of the tach reading but on a steep freeway downhill I got my K75 up to 120 mph. I've corrected my speedometer to be accurate according to GPS. Side and top cases were on (sticker under the seat says not to exceed 80 mph with side cases on...ooops).

Well at 80 mph I'm turning about 5400 rpm. 5400/80=67.5 rpm per mile per hour. 67.5x120 mph=8100 rpm (approx but accurate according to the math). Redline is 8600 rpm )though the manual says max operating rpm is 8400). 8600 rpm/67.5=127.41 mph. So according to my theory, the maximum speed a K75C could go is 127 mph as that is the speed attained by redlining the engine (in 5th gear).

You could get the bike to accelerate quicker like with a Luftmeister turbo if you can find one, or find a bike with one, but you can only go so much faster, unless you changed out the final drive gearing.

If you want a faster bike I'd suggest buying a faster bike
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  • Grand Rapids, MI
  • '87 K75C
'87 K75C w/ Pichler V1 fairing. LED's, CATZ driving lights, Audiovox cruise, LT top case, tons of other mods by Drake...

Offline johnny

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Re: Supping up the 740cc on my K75S
« Reply #3 on: May 04, 2016, 10:20:21 PM »
taller tiors...

nitrous kit...

pushbutton shift...

ceramic bearings...

4 hole injectors...12v ram supercharger...

glasspack...

tripple exhaust...

performance chip...

weight jacker....

downforce generators...

cowl induction...

traction control...

traction bars...

nitro methane mixer...

decking head...

shift kit...

velocity stacks...

rack and pillion steering...

antisway bar...



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  • :johnny i parks my 96 eleven hundert rs motobrick in dodge county cheezconsin  :johnny

Offline Elipten

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Re: Supping up the 740cc on my K75S
« Reply #4 on: May 04, 2016, 11:38:54 PM »
Just buy a Vmax
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  • San Antonio, TX
  • 1990 K75RT

Offline Laitch

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Re: Supping up the 740cc on my K75S
« Reply #5 on: May 05, 2016, 06:15:58 AM »
Grip streamers, fringed tragkorbs, helmet propellor.
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  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline Brad-Man

  • ^ Proficient Motobricker
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Re: Supping up the 740cc on my K75S
« Reply #6 on: May 05, 2016, 09:45:58 AM »
Flux capacitor...
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  • Marietta, GA
  • '85 K100
Toys don't make the Man - Man makes the Toys...
'74 RD350
'75 RD350 w/Modified 400 engine, Chambers & MZB iggy

Offline Bill

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Re: Supping up the 740cc on my K75S
« Reply #7 on: May 05, 2016, 10:18:18 AM »
Ferrari Red paint, racing stripe and divine intervention
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  • Sutton, Ontario, Canada
  • K100 LT
Current:  88 K100 LT

86 K100 R-?L?T parts collection in loose formation...

previous:
84 V45 Sabre
74 CB400
72 CB750

Offline F14CRAZY

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Re: Supping up the 740cc on my K75S
« Reply #8 on: May 05, 2016, 10:27:42 AM »
A K1 could hit 150 (so they said) but that was with considerably more engine, Motronic, and super special bodywork
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  • Grand Rapids, MI
  • '87 K75C
'87 K75C w/ Pichler V1 fairing. LED's, CATZ driving lights, Audiovox cruise, LT top case, tons of other mods by Drake...

Offline Laitch

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Re: Supping up the 740cc on my K75S
« Reply #9 on: May 05, 2016, 01:48:13 PM »
Quote from: Devil K on May 04, 2016, 08:14:06 PM
so what I'm asking is do they make performance parts for this bike so that it will hit a "ton and a half"?
3000mph is a lot to ask of a K75 but an unbridled willingness is evident here to help you achieve this goal. There are certainly many good, low-cost suggestions in this thread already.
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  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline Devil K

  • Motobrick Curious
  • Posts: 40
Re: Supping up the 740cc on my K75S
« Reply #10 on: May 05, 2016, 02:34:09 PM »
Lol when I said a ton and a half I was talking old school. a "ton" means 100 MPH so a ton and a half means 150 MPH and where could I find one of these chips?
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  • Kernville
  • 1994 BMW K75S

Offline Devil K

  • Motobrick Curious
  • Posts: 40
Re: Supping up the 740cc on my K75S
« Reply #11 on: May 05, 2016, 02:39:45 PM »
Tell me more about those last few Items Johnny
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  • Kernville
  • 1994 BMW K75S

Offline Devil K

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Re: Supping up the 740cc on my K75S
« Reply #12 on: May 05, 2016, 02:42:27 PM »
A glasspack sounds awesome but I would like to make it to wear the exhaust cuts right and goes behind the tire and out the other side. Also I'm going for that cafe look on my bike.
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  • Kernville
  • 1994 BMW K75S

Offline johnny

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Re: Supping up the 740cc on my K75S
« Reply #13 on: May 05, 2016, 03:25:52 PM »
I CAINT COMMENT UNTIL SUPPED UP IS CHANGED TO SOUPED-UP CAUSE AT THIS POINT I DONTS KNOW WHAT THIS THREAD IS ABOUT...


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  • :johnny i parks my 96 eleven hundert rs motobrick in dodge county cheezconsin  :johnny

Offline Laitch

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Re: Supping up the 740cc on my K75S
« Reply #14 on: May 05, 2016, 05:55:10 PM »
Quote from: johnny on May 04, 2016, 10:20:21 PM
rack and pillion steering...
I tried pillion with rack steering but it was too damned distracting.
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  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline Chaos

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Re: Supping up the 740cc on my K75S
« Reply #15 on: May 05, 2016, 06:37:57 PM »
Easiest way to hit a ton and a half is switch out the speedo with a KPH unit.
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  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
sold 6/23
2023 Ural 2WD sidecar (BMW's bastard step child)

Offline Laitch

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Re: Supping up the 740cc on my K75S
« Reply #16 on: May 05, 2016, 06:48:26 PM »
Quote from: Devil K on May 05, 2016, 02:34:09 PM
Lol when I said a ton and a half I was talking old school. a "ton" means 100 MPH so a ton and a half means 150 MPH . . .
Clearly, I should chosen differently between the Old School as A Second Language class and the tomato bisque buffet when the choices were offered at the Senior Center.
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  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline F14CRAZY

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Re: Supping up the 740cc on my K75S
« Reply #17 on: May 05, 2016, 07:04:48 PM »
A liter would have a better chance of reaching a ton and a half
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  • Grand Rapids, MI
  • '87 K75C
'87 K75C w/ Pichler V1 fairing. LED's, CATZ driving lights, Audiovox cruise, LT top case, tons of other mods by Drake...

Offline Laitch

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Re: Supping up the 740cc on my K75S
« Reply #18 on: May 05, 2016, 07:29:28 PM »
Sell that sissy little K75 before you destroy it and yourself, Devil. There's a K100 Turbo for sale on the Maine CL.
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  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline Scud

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Re: Supping up the 740cc on my K75S
« Reply #19 on: May 05, 2016, 07:37:40 PM »
Quote from: Laitch on May 05, 2016, 06:48:26 PM
...and the tomato bisque buffet...

That's the kind of supper I though we were talking about. Taking your K75s out to a nice dinner... maybe a nice bottle of k-bike whine... is it a coincidence that a 750ml bottle of wine exactly equals the volume of a 750cc BMW?  I think not.

My K75s does the ton-and-a-half in kilometers/hour. Just change to a metric speedo - it will seem like you are going way faster - you might even make it to 200.
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  • Carlsbad, CA
  • 1992 K75s. 2002 Moto Guzzi V11 Scura, 2003 Moto Guzzi V11 LeMans. 2007 Husqvarna TE450

Offline Chaos

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Re: Supping up the 740cc on my K75S
« Reply #20 on: May 05, 2016, 09:29:32 PM »
Quote from: Laitch on May 05, 2016, 07:29:28 PM
Sell that sissy little K75 ...

It finally come out...k75's are GIRL's bikes, heard it from my jeep harley hayabusa buds, now I see it in black and white here.  I feel so effeminate.
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  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
sold 6/23
2023 Ural 2WD sidecar (BMW's bastard step child)

Offline The Dude

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Re: Supping up the 740cc on my K75S
« Reply #21 on: May 07, 2016, 01:30:46 AM »
Quote from: Scud on May 05, 2016, 07:37:40 PM
Quote from: Laitch on May 05, 2016, 06:48:26 PM


My K75s does the ton-and-a-half in kilometers/hour. Just change to a metric speedo - it will seem like you are going way faster - you might even make it to 200.
Regularly used to get 200kph on my K75S.220kph is possible too,with a small amount of patience.My speedo is spot on with my gps!Definately,Just need some "Bottle".That was how I tested the tuning although it never failed me, any time.
'Must admit I'm a bit of a sissy,now,though.Havn't quite turned into a girl,yet...now,they make you walk if you get caught over 140kph.You can do that just by accident.....officer.Licence gone.
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  • Auckland, New Zealand
  • K75s
Current.
TR6R 1973 from new.
Moto guzzi 850 III .1983 from,almost, new.
K75S 1986 from new.vin-0103141
On my second millionth km.give or take a hundred k Kay's.
"The Dude abides. I don't know about you but I take comfort in that. It's good knowin' he's out there."
All the best!

Offline The Dude

  • ^ SuperNatural Motobricker
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Re: Supping up the 740cc on my K75S
« Reply #22 on: May 07, 2016, 04:13:27 AM »
Quote from: The Dude on May 07, 2016, 01:30:46 AM
Quote from: Scud on May 05, 2016, 07:37:40 PM
Quote from: Laitch link=topic=8265.msg62396#msg62396 date=1462488506
[/quote
Regularly used to get 200kph on my K75S.220kph is possible.
Er,hem they can be thrashed but at this speed the instruments are jumpin all over the place and,well 220kph might get clipped as the needle swings up and down and looking down needs to be so quick you see what you are imagining.
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  • Auckland, New Zealand
  • K75s
Current.
TR6R 1973 from new.
Moto guzzi 850 III .1983 from,almost, new.
K75S 1986 from new.vin-0103141
On my second millionth km.give or take a hundred k Kay's.
"The Dude abides. I don't know about you but I take comfort in that. It's good knowin' he's out there."
All the best!
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