Author Topic: REMOVING INJECTION AND REPLACING WITH STD CARBS  (Read 13342 times)

Offline shrek51

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REMOVING INJECTION AND REPLACING WITH STD CARBS
« on: September 02, 2014, 04:26:03 PM »
Has anyone removed the injection and replaced with std carbs if so how and carbs from what and set up
cheers

Offline richarddacat

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Re: REMOVING INJECTION AND REPLACING WITH STD CARBS
« Reply #1 on: September 02, 2014, 05:29:57 PM »
why? :spam:
loud pipes annoy people, well designed helmets save lives.

Offline pdg

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Re: REMOVING INJECTION AND REPLACING WITH STD CARBS
« Reply #2 on: September 02, 2014, 06:12:29 PM »
I'm not sure I see the spam connection, maybe I view spam differently..........

It's been done on (afaik) all the flavours of brick.

How = unbolt injection gubbins and bolt carbs onto a suitable inlet manifold.

From what = a carbureted petrol engine.

Set up = to do it properly you need a dyno, to bodge it just experiment with jets/needles.

You'll need to do some playing with the electrics too.

HTH
1988 K75S

Offline F14CRAZY

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Re: REMOVING INJECTION AND REPLACING WITH STD CARBS
« Reply #3 on: September 02, 2014, 10:10:10 PM »
fer wat?
  • 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 jacksdad1963

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Re: REMOVING INJECTION AND REPLACING WITH STD CARBS
« Reply #4 on: September 02, 2014, 10:57:15 PM »
Of course its possible.....but why?
Pointless exercise to me,  it can be done, but i doubt you'd see any power increase: more like the opposite!
K1100LT 1995 mystic red
Yamaha XS650 1976 fully restored
a few cars and 4x4's

Offline Elipten

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REMOVING INJECTION AND REPLACING WITH STD CARBS
« Reply #5 on: September 02, 2014, 11:47:06 PM »
I would rather see the replacement with a newer more capable computer, sensors and modern fuel injection.  Why step back to the mid 20th century?
  • San Antonio, TX
  • 1990 K75RT

Offline johnny

  • TrailBrakingThrottleWhacker
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Re: REMOVING INJECTION AND REPLACING WITH STD CARBS
« Reply #6 on: September 03, 2014, 06:42:15 AM »
i heart spam... its some fine gelatinous pig...

also heart car drive shafts car shocks and car tiors on motobricks... i can see an eight pack rig hanging off there...

j o

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

Offline Chaos

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Re: REMOVING INJECTION AND REPLACING WITH STD CARBS
« Reply #7 on: September 03, 2014, 08:51:48 PM »
I remember seeing a K75 with a home made manifold and a single SU carb.  Looked pretty wonky, but it ran.  Also seen turbo conversions with a carb, that makes more sense.
  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
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Offline racinrich

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Re: REMOVING INJECTION AND REPLACING WITH STD CARBS
« Reply #8 on: September 14, 2014, 08:55:18 AM »
why not buy a Harley if you want to play with carbs  :hehehe
1993 k1100 lt silk blue
des plaines ill
USA

Offline K75RT Keith

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Re: REMOVING INJECTION AND REPLACING WITH STD CARBS
« Reply #9 on: September 16, 2014, 03:26:11 PM »
Luftmiester had a kit that put carbs on a brick.  But why would you want to?. If you want to play with carbs and spend a bunch of time adjusting them, go buy a CB900.  After about 20 miles you'll be dialing them back in. BTDT.
You can't help someone who doesn't want to hear the answer.

1990 K75RT

Offline bocutter Ed

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Re: REMOVING INJECTION AND REPLACING WITH STD CARBS
« Reply #10 on: September 16, 2014, 05:45:41 PM »
why not buy a Harley if you want to play with carbs  :hehehe
Strangely ... one of the 'lunch brothers' on a woodworking forum I frequent, converted his Harley, I think a Y2K er, from fuel injection back to carbs. He's happy with it so who am I to argue.
  • Toronto, Canada
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Offline jacksdad1963

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Re: REMOVING INJECTION AND REPLACING WITH STD CARBS
« Reply #11 on: September 17, 2014, 05:52:10 PM »
But you are overlooking one major point:
The Harley is an old tractor engine....and the BMW is a super-finely tuned piece of Internal Combustion Engine Wizardly-ness!  :hehehe
K1100LT 1995 mystic red
Yamaha XS650 1976 fully restored
a few cars and 4x4's

Offline wmax351

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Re: REMOVING INJECTION AND REPLACING WITH STD CARBS
« Reply #12 on: September 22, 2014, 03:28:47 PM »
Carbs would be tricky to set up on the K. The reason why the factory went with fuel injection is partially that it was easier to make work well than carbs. You would either need 3/4 very small form factor, but still large throated downdraft carbs, or you would need a complicated and heavy manifold and manifold heating system, paired with either a single carb (which saps low end throttle response in order to have good performance at higher rpm) or to have 3 sidedraft carbs in a very non-ideal configuration.


The L-jetronic is bulletproof. Just keep it on there.


I updated my fuel injection system to a megasquirt, a modern system, and went back to the Jetronic. It works plenty well, and is absolutely reliable.
  • Albuquerque, NM
  • 91 BMW K75 Standard, 98 Moto Guzzi California EV
Bikes:
Current:1991 BMW K75 Standard, 1998 Moto Guzzi California EV11
Past: '83 BMW R65LS, '75 Honda CB550F, '69 Honda CB175, 1999 Royal Enfield Bullet 500, 1973 Triumph Tiger TR7V, 1971 BMW R75/5 in Toaster outfit, 1979 Harley Davidson XLS-1000 Sportster Roadster

Offline F14CRAZY

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Re: REMOVING INJECTION AND REPLACING WITH STD CARBS
« Reply #13 on: September 22, 2014, 04:42:21 PM »
If you could come up with a Megasquirt system using an oxygen sensor, a MAF or MAP sensor, then you'd be all set. But then again I don't see any issues with L-Jetronic that make it worth messing with. What I'd rather have is an extra gear
  • 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 wmax351

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Re: REMOVING INJECTION AND REPLACING WITH STD CARBS
« Reply #14 on: September 23, 2014, 12:07:23 AM »
If you could come up with a Megasquirt system using an oxygen sensor, a MAF or MAP sensor, then you'd be all set. But then again I don't see any issues with L-Jetronic that make it worth messing with. What I'd rather have is an extra gear


I had it with a wideband O2 sensor and a MAP/TPS blended tuning system. Having just ridden it back in stock config for the first time today, the only advantage of the Megasquirt was better low end throttle response.
  • Albuquerque, NM
  • 91 BMW K75 Standard, 98 Moto Guzzi California EV
Bikes:
Current:1991 BMW K75 Standard, 1998 Moto Guzzi California EV11
Past: '83 BMW R65LS, '75 Honda CB550F, '69 Honda CB175, 1999 Royal Enfield Bullet 500, 1973 Triumph Tiger TR7V, 1971 BMW R75/5 in Toaster outfit, 1979 Harley Davidson XLS-1000 Sportster Roadster

Offline Cafe racer

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Re: REMOVING INJECTION AND REPLACING WITH STD CARBS
« Reply #15 on: October 02, 2020, 11:09:38 PM »
I saw it done by a bike mechanic he rejetted suzuki bandit 400cc carbs al,ost plug and play, the owner of the K said it had never run as good after the conversion...
  • Japan
  • K100RS 1988 2 valve

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