New Gas Analyser for my GS

[AOD]

if you have CV carbs on the bike...then it doesn't have a fuel screw. you have the air screw up on the front side of the carbs toward the intake boots. maybe you're getting too much air.

~Adam

[saaz]

It is the exhaust gas temp that matters with O2 sensors. And not all sensors are alike in the way they handle temperatures and how accurate they are away from the ideal air: fuel mixture. So you will have to know the specs of the O2 sensor you are using to see how far off the mixture may really be. The sensors just supplies a voltage figure based on the input it senses. It is not an absolute measuremet. On cars the idle circui is usually not a closed loop circuit, so the O2 sensor does not control idle mixtures, same as it does not control wide throttle mixtures when power is needed. The O2 is great for constant throttle situations, but is an indicative tool possibly in other situations. The setup you have to read mixtures while riding sounds like a good way to go, but I don't know whether all sensors will read what you need to know.

The following is a quote from a simple magazine piece on modern engine management systems (the 14.7 ratio is cruise mode):


However, a typical oxygen sensor used in mass-produced cars can measure the air/fuel ratio only over a quite limited range. The sensor is designed to be very sensitive around 14.7:1 air/fuel ratios, because that's where its input is most important.

[terry]

if you have CV carbs on the bike...then it doesn't have a fuel screw. you have the air screw up on the front side of the carbs toward the intake boots. maybe you're getting too much air.
~Adam

Is that right mate? Well bugger me, K&N have really screwed up! Let me quote direct from their Dyno Jet set-up manual for CV carbs:

"The fuel mixture screws control fuel. They are used in conjunction with all the carbs other jets to allow a means to compensate for difference in seasonal temperature, and geographical locations. Turning the screws in restricts fuel giving leaner mixtures at idle and in the cruising mode. Turning the screws out increases fuel flow giving richer mixtures which can improve cold weather operation."

I'm often wrong (just ask my wife) but this time, I think I'm on the money. :twisted:

[first timer]

terry, k and n is right, the screw being discussed is a fix mixture screw, not a air screw. when you turn the screw out you increase the mixture, not to be confused with altering the mixture (air/fuel). you are just simply increaseing more air and fuel at the same time. so if you are running lean you want to turn your screws out a couple turns to add more air and fuel mix into the combustion chambers. i found the best way to tune your carbs is leave your needles in the middle postion like k and n recomends and then adjust the mixture screw until you get a nice mix, in the lower end of the rpms 2k to 6k ish if you notice you bike laging or hesitateing then try to adjust the needles up or down one step and see if that improves or hurts the bike. i was having all sorts of troble until i got my mixture screws set right, and had to do it by spark plug color not one of those fancy sensors you got you lucky... here is a basic idea of what does what

but the mixture screw at least for me seems to have a affect all the way acrossed the board, up to about 6k so go ahead and turn the\ose screw out a couple time. this is information regaurding CV style carbs i don't know how the vm carbs work

ryan

[AOD]

hmmn...a tad dissapointed i am. i went out after riding today and finished the wiring on my sensor reader. it has 3 wires, black, red, white. i hooked up the red to the + side battery, black to the - side battery, and white i spliced to the wire on the O2 sensor.

got a red light on the sensor when i hooked it up to the battery...with the bike off it was sitting at 'lean'. i started the bike up...and the sensor readout never moved. i let it run for at least thirty seconds (fuel tank was off).

maybe my splice job at the sensor was bad...i'll try it again another day. for now, i tore all the wires off the bike and threw them in the trunk. i was kinda mad. :x

[AOD]

This voltage is created when the sensor is heated to between 360 degrees centigrade (680 F) and 900 degrees centigrade (1650 F) and varies between zero and one volt.

hmmn...maybe i should let it run longer?

[terry]

Hmmnn, do you have any fitting instructions mate? My "Black Box" has 3 wires, coded red/black/green, red goes to positive side of battery, black to negative side of battery, and green goes to the sensor.

When I connect it (it doesn't have an on/off switch) it will display the base setting of 14.7:1. OR the letter L (for lean, so it looks like your meter is functioning correctly ) I start the engine, and either ride it or warm it up for a few minutes. (mine gets hot pretty quick with the big bore kit and cams etc, so I use a fan to lessen the risk of overheating)

Once properly warm it will display the actual fuel air ratio on the digital display, and the LED display will point to either lean or rich. When I switch the engine off, the meter reverts back to the base settings.

I think that you've connected it all correctly, so maybe your splicing job at the sensor isn't good (doubtfull) or perhaps the sensor isn't working? I had a look at the pics you posted of your sensor mounted in your exhaust system, I don't know how long yours is, but with mine, it protrudes into the pipe about an inch, to catch the exhaust flow passing through the pipe.

If your sensor doesn't actually protrude into the pipe it would take longer to give you a reading, I imagine. :twisted:

[AOD]

mines goes in about 1/2 to 3/4 of an inch...because the bung is 1/4" thick at least.

i think it didn't work because i didn't let the bike warm up enough. i picked up some better splice connectors yesterday...i may try to hook it up again.

~Adam

[joe.d]

SOme body posted that the mufflers dont get hot check out my leg a week later.....Eeek

any how My bike is kept arround my dads place in his garage, tucked up for the winter I hadnt run it for a few weeks so I run it for a while,
took it off its center stand and got it close to the wall as my dad asked,
No problem but them exhausts get hot damn quick

[first timer]

ganggreen yum

[Doze]

Good Lord Joe, that looks seriously painful. Did you manage to keep the bike upright when that happened? Or did you just toss it away?
Doze.
P.S. hope that doesn't take too much longer to heal up.