A couple of notes on the jetting testing with the O2 sensor...
It is quite difficult to get a clear understanding of the settings without some kind of data logger that you can analyse later and compare Lambda readings against engine rpm to identify exactly which areas of the carb are running too rich or lean. With this current set up, I am doing some hard pulls and chopping gears trying to see how the carb responds, then trying to remember what the gauge's readings were and adjust the carb based on that.
Although I got pretty close with some settings, I think further dyno time is necessary. I will book in for some time this November.
What is interesting is how different the O2 readings are based on throttle position, speed and rpm. For example, you can be cruising at 80kph in 4th at say 4000 rpm and be reading in the 14's - which is almost stoich, but a little lean if you want best power. Then you can whack open the throttle, and despite having a CV carb, the O2 readings can jump into the 11's! The way we set the carb up on the dyno last time was through power pulls - from 2500 - 8500 rpm wide open. That gives you the best settings for maximum power rather than maximum efficiency. Although I think what you would find is that under normal cruising conditions, those settings would give readings in the 14's as well.
It is quite difficult to get a clear understanding of the settings without some kind of data logger that you can analyse later and compare Lambda readings against engine rpm to identify exactly which areas of the carb are running too rich or lean. With this current set up, I am doing some hard pulls and chopping gears trying to see how the carb responds, then trying to remember what the gauge's readings were and adjust the carb based on that.
Although I got pretty close with some settings, I think further dyno time is necessary. I will book in for some time this November.
What is interesting is how different the O2 readings are based on throttle position, speed and rpm. For example, you can be cruising at 80kph in 4th at say 4000 rpm and be reading in the 14's - which is almost stoich, but a little lean if you want best power. Then you can whack open the throttle, and despite having a CV carb, the O2 readings can jump into the 11's! The way we set the carb up on the dyno last time was through power pulls - from 2500 - 8500 rpm wide open. That gives you the best settings for maximum power rather than maximum efficiency. Although I think what you would find is that under normal cruising conditions, those settings would give readings in the 14's as well.