I had been using Bosch 4417's, but put in Autolite 3923's before going for a nice ride yesterday afternoon. I also put some Techron in the tank. Instead of focusing on how the engine was running I just decided to ride -- took some nice secondary roads, a few curves, a fair amount of hills, and 20 miles of freeway.
Boy what a difference compared to the "old" bike! There is a goodly increase in torque, particularly noticeable in the 3000-4000 rpm range where I often ride. I found myself giving it lots of throttle whenever there was the slightest opportunity, and had to be careful in 1st and 2nd gear not to let the front wheel come off the ground! I never had that "problem" before the LC-1. The "surge" seemed a little less than the day before, but I could still feel it. The wideband O2 modification is definitely a keeper. I'm running at lambda =.94 (13.8 AFR), and plan to just leave it there for a while.
A little reflection on my experience and exchanges with Roger leads me to wonder just what constitutes a surge? We talk about "surging" as though everyone knows what we mean, but I suspect it means somewhat different things to different people. Do conditions matter, for example, is it detectable in normal riding vs. optimal conditions for surging? Is there a way to quantify the surge -- how strongly it is felt, at what rpms, in what gears, etc.? Yesterday I could detect what to me was a slight surge, but I suspect others may not notice it or think of it surging. Since we use surging as one criterion of how our bikes are running it might be good to be more specific about what we mean.
'01 R1150GS, LC-1, AFR 13.8
Shaker Heights, OH