Hambo
Guest
'95 1100 GS, no cat, no lambda sensor, beige control plug removed, otherwise stock
Since servicing the bike some 8000kms ago, I had a BM mechanic hook up a diagnostic computer to balance the throttle bodies and confirm all was ok. At this time he adjusted the CO potentiometer, however to what CO % vol I'm not sure. Since then fuel consumption has dramatically increased; 400kms from the 31 ltr Adv tank, instead of the previous 500kms regularly achieved throughout the 5 months and 25,000kms in Australia. The end of the standard exhaust is now quite black, with signs of carbon having run down the underside of the silencer.
After scrolling through post posts, I've established with a multimeter the potentiometer is a 16 turn, 1000 ohm pot, each turn clockwise after the last 'click'. The first full turn shows no resistance, each full turn subsequently equates to 66.7 ohms, accumulating in 1000 ohms after 16 full turns. I understand the higher the resistance (clockwise) the weaker the mixture.
Now I appreciate the easist way to set the potentiometer is to use a CO analyser in the exhaust to measure emissions and adjust slowly, (waiting 20 secs or so to take effect), but I'm in Patagonia, Argentina with no CO analyser!
I've presently adjusted the pot to 900 ohms. At a standstill and up to 5 bars on the temp guage, the bike runs ok and appears to be less smokey. My next plan is to take it for a run and do a plug chop to give me an idea how weak / rich the mixture is. However, if anyone can let me know what resistance they reckon it should be, it'd be appreciated and put my mind at rest.
Thanks, Hamish
www.horizonsunlimited.com/tstories/hameandem
Since servicing the bike some 8000kms ago, I had a BM mechanic hook up a diagnostic computer to balance the throttle bodies and confirm all was ok. At this time he adjusted the CO potentiometer, however to what CO % vol I'm not sure. Since then fuel consumption has dramatically increased; 400kms from the 31 ltr Adv tank, instead of the previous 500kms regularly achieved throughout the 5 months and 25,000kms in Australia. The end of the standard exhaust is now quite black, with signs of carbon having run down the underside of the silencer.
After scrolling through post posts, I've established with a multimeter the potentiometer is a 16 turn, 1000 ohm pot, each turn clockwise after the last 'click'. The first full turn shows no resistance, each full turn subsequently equates to 66.7 ohms, accumulating in 1000 ohms after 16 full turns. I understand the higher the resistance (clockwise) the weaker the mixture.
Now I appreciate the easist way to set the potentiometer is to use a CO analyser in the exhaust to measure emissions and adjust slowly, (waiting 20 secs or so to take effect), but I'm in Patagonia, Argentina with no CO analyser!
I've presently adjusted the pot to 900 ohms. At a standstill and up to 5 bars on the temp guage, the bike runs ok and appears to be less smokey. My next plan is to take it for a run and do a plug chop to give me an idea how weak / rich the mixture is. However, if anyone can let me know what resistance they reckon it should be, it'd be appreciated and put my mind at rest.
Thanks, Hamish
www.horizonsunlimited.com/tstories/hameandem
