07-01-2017, 10:43 PM
When I got my used 2013 it was equipped with a full yosh exhaust and popped on decel and shifting. I put a marble in the hose between the air box and the AIR system which fixed that problem. Search this forum for details, but basically the AIR system injects air at the exhaust valves to burn off unburned fuel which occurs as a rich condition when the throttle valves close on decel or between shifts. It's been 4000 miles now and no obvious downside. I think Motogeezer deleted the whole system. The pop at idle may be due to excessive lean condition at idle, which can be eliminated with an O2 sensor bypass plug which has also been discussed here. Too lean will also result in incomplete combustion and from what I have read here and in my own experience the purpose of the O2 sensor on this bike is to lean the mix at idle primarily. The altitude (barometric) and temp compensations are handled by other sensors, so it doesn't affect mileage or performance significantly. Don't just disconnect it, the check engine light comes on and who knows what else.
Ben
Ben