So yeah, still chasing the odd mid-range stutter on my 2008 650. So just so give an idea. Cruising at maybe 4500 RPMs and I fully close the throttle for whatever reason. As soon as I open it back up ...PPHHHPHHH POP. You can feel it. I got so frustrated today that i kept sticking my boot next to the exhaust and feeling it- a drop in pressure as you go to 0%, then when you roll back on, it hesitates and a burst of air farts out and taunts me with a sudden jerk and pop.
I've taken the 2bros off and put the stock can back on it-- nope. Disabled the Power Commander 5 and AT200-- NOPE. still does it. I've checked the TPS voltage, which read at around 1.020v while idling at 1300rpm. I've checked valve clearances. I've synced the throttle bodies. It's driving me up the wall so much that i'm considering selling it. Nothing has seemed to help this stupid stutter!
So here's my final cries for help: I'm thinking it's electrical- a sensor? The TPS wiper being worn out?. My "uh-oh" light; one of those fancy color changing LEDs, went nuts today. While it was going nuts however, nothing changed, but the popping/surging still resumed.
Could a busted MAF cause this? They're pretty cheap, but i don't want to just crack into all of this without first wondering if it's possible. When i got the bike, the previous owner had the MAF just kinda haphazardly ziptied to the frame, having fell on the left side. I got a new bracket and reinstalled it, but not sure if maybe it got busted up, or perhaps the sensor wires could have a short?
Pic just in case you're not sure what i'm referring to:
I once had a car with a wonky MAF, and it ran like dog balls unless it was cleaned every so often. Could a dirty / wonked MAF cause these midrange stutters i'm experiencing when coming from off-throttle? Anyone ever heard of this?
Another desperate thing I thought was to just get a new throttle body. I've heard that the TPS wiper can wear out in a range and give bizarre readings, but this feels too heavy handed.
I've already replaced the coils with Ninja 650R coils, which are the "upgraded" densos that the Gen 3's started using, but now with my UhOh light freaking out, i'm now wondering if all of this is from the dreaded Stator / RegRect issues some Versyseses experience with burning out quickly.
Really.... where should I go from here? Because I'm at my wits end.