I rode my 07 ZX10R on the weekend and found that whenever I accelerated past 6000 rpm and back the throttle off, it maintained a partially open throttle and only slowly reduced rpm. This got pretty scary a few times heading into a corner expecting some engine braking and there was none. The interesting points about this behavior is that if I forced the throttle closed hard, it backed off. If I allowed the bike to slow gradually without forcing it and took my hand off the throttle, every time it hit 5,000 rpm's, without fail, it backed off suddenly and normally. All throttle operation below 5000 rpm is totally normal. Idle speed is also normal. This repeatable behavior has to be part of the clue, and makes me think the problem is electrical in nature.
I've recently fitted Helibars, new brake lines, and had just flashed (Woolich) my ECU to open the STP's much earlier and more aggressively than stock. It's running a KRTuned full exhaust system with no exhaust valve, and has a tuned PCIII.
I've checked the cables, routing and throttle operation, and all is normal.
I've reflashed the ECU back to factory to see if it fixes the problem, but don't know yet.
I've only had the bike for a couple of months, so can't say much about it's history. Can anyone give me any ideas as to why this might happen, or what else to check?
2013 ZX14R SE ABS (aka:ANIML).Polished wheels,Supersprox sprocket,clear filmed paintwork,frame caps,rear seat cowl,ceramic coated Akrapovic headers,carbon Yoshimura R77s,H9 modded lighting,Zero Gravity screens,Ventura rack,tinted lenses,Genmar risers,Throttlemeisters,Pazzo levers,custom stainless radiator guard,Yoshimura fender eliminator,Woolich Log Box Pro,Zeitronix O2 controller,ECU flash.