The biggest thing when changing the A/F ratio to 13.6:1 in the closed loop is it allows for less hand movement throttle & clutch as it is easier to keep the bike cruising you are not fighting the fuel injection as much especially in the sport mod, with less on/off throttle movement there would be less on/off load on the chain & sprockets. I have never really thought about it but I would think it might make a marginal difference in chain & sprocket life, but there again you have a hooligan bike that loves to be revved & ridden hard.Would I be in the ball park of the truth here Kevin?
Your device would have little effect on tyre wear since it is really only relevant until 20% throttle. Rear tyre wear would be due to larger throttle openings than that.
But if you spend a lot of time commuting in the 0-20% throttle zone, could it be kinder to chain, sprockets, gearbox, cush-drives and other stuff; maybe even the engine? I found I used to ride the clutch an lot when scooting through traffic, just to smooth and settle the bike. Hopefully that's all behind me now.
This 690 motor does have quite a bit of drive line shunt when the motor is lugged around at low RPM's due it's crank to clutch & final drive ratios this is a Characteristics of it's design which we can only change the final drive sprocket ratio, I do think the bike is over geared & would go one tooth down on the front sprocket if I owned one. As for the fuelling it is just to lean in the open & closed loop maps for emission control like every other new bike out there, with the single cylinders & V twin motors showing the worst side affects of the lean A/f ratio's.