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Author Topic: O2 sensor  (Read 4115 times)

Offline subforry

  • ^ Proficient Motobricker
  • Posts: 162
O2 sensor
« on: March 24, 2014, 01:33:14 PM »
I have been meaning to ask this for awhile now.  What does the O2 sensor do?  Is it before the cat air/fuel ratio or after the cat emissions stuff?  Does it need to be replaced since mine is 18 years old, though low mileage of 24k?
Thanks.
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  • Hermosa Beach, CA, USA
  • 1996 K1100RS
1981 Suzuki GS850G
1990 Suzuki Katana 1100 (GSX1100F) - sold
1996 BMW K1100RS
2009 BMW K1300GT

Offline Scott_

  • Administrator
  • ^ Quintessential Motobricker
  • Posts: 2198
Re: O2 sensor
« Reply #1 on: March 24, 2014, 06:06:35 PM »
It is after the cat converter to monitor the effectiveness of the converter and adjust the fuel mixture based upon it's readings.
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  • My Garage
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Offline johnny

  • TrailBrakingThrottleWhacker
  • ^ Quintessential Motobricker
  • Posts: 7650
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Re: O2 sensor
« Reply #2 on: March 25, 2014, 12:26:22 AM »
i took mine out and installed a sparkplug to effective utilize unburned gas... when i getts my valves adjusted i will put the 02 sener back in there...

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

Offline wmax351

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Re: O2 sensor
« Reply #3 on: March 25, 2014, 03:56:15 AM »
I added one to my K75.
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  • 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 Motorhobo

  • +20 years of K75
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Re: O2 sensor
« Reply #4 on: March 25, 2014, 06:21:27 AM »
Quote from: wmax351 on March 25, 2014, 03:56:15 AM
I added one to my K75.

Why would you do that? Not that I doubt you have a good reason besides it being a conversation starter.

Van.
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1994/1995 K75 ABS Frankenbike: original engine 136k miles, frame from Gary Weaver (RIP), 173k miles -- Current Odometer: 193k miles
1994 K75 since 2013, 76,000 mi (11k mine) w/California Sidecar Friendship II Sidecar & Black Lab 'Miss B'

Past: 1974 Honda 550/4 (first bike), 1994 K75 (sold), 1995 K75 ABS (parts bike), Sidecar Dog & Best Bud 'Bo' - RIP

Offline wmax351

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  • Posts: 1237
Re: O2 sensor
« Reply #5 on: March 25, 2014, 05:48:43 PM »
I have an aftermarket, custom fuel injection system (megasquirt) running the fuel on my K75, replacing the ancient L-Jetronic. I'm going to add in ignition control this summer (currently, it still uses the stock ignition brain under the steering  head). That's a wideband O2 sensor, that can measure accurately from 10:1 AFR to Free air, though in the current setup, it can only measure to 20:1, which is more than sufficient for tuning purposes. A normal O2 sensor only does above or below stoichiometric (14.7:1).
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  • 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
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