Thanks Roger. At idle I'm hearing the engine and seeing the tach jump about every 10 seconds, minor. Attempting to hold an even RPM in any gear anywhere up through 4K demonstrates hunting rather than steadystate engine speed. I find this disconcerting as well as less than ideal, especially when setting up for and coordinating turns. I bought the bike second hand with 25Kmi on it and these symptoms have been there since I took possession. In the meantime I've blueprinted the valve clearances and timing, changed spark plugs, and used my GS-911 to baseline all fuel-related adaptations (idle, etc.) in an attempt to clear this up, sadly with no change in behavior. I believe I read a reference of yours a number of pages up in the "thermometer (Booster Plug) / thermostat (AF-XIED)" analogy that these devices compliment each other. Was this only for prior year model bikes? Am I correctly interpreting your advice to yank the BP as being due to the modern BMSK adaption over time? My understanding was that with the BP onboard the O2 sensors connections were to be retained (and still are). Now that I plan on adding the AF-XIED, the O2 sensors will in fact still be retained. Please let me know why the BP is rendered useless if not complimentary to the lambda shifters. As always, much appreciated!