Training Wheel Hero
Join Date: May 2011
Location: Perth, WA, australia
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
07 600rr, high rpm false limiter, bike won't rev over 13k to
Ok guys, first up the bike.
Hrc Ecu, loom, and cams.
Full system arrow.
Ngk imr9c-9hes plugs.
I think that's about all that's relevant.
Long story short, my bike won't rev beyond 13200 rpm once it is warm. Cold will also only pull to about 14500. The limiter is set at 15800.
This is not a subtle sort of 'it wont rev any harder' it is a full blown rev limiter.
It started out feeling like a small stutter, barely noticeable at around 13k rpm, and I also at this time could not rev beyond 15k rpm. The small stutter grew stronger, to the point where the bike had to fight past that rpm range, then it Would break free and power on as normal. I should at this point say that these issues got worse as the bike warmed up. Cold out the pits it would rev all the way beyond 15k rpm. A few laps later the stutter would begin and progressively get worse...
The issue now happens at all temps, the issue being what feels like a lowered rev limiter. At best 14500rpm when cold, but after only a minute on track it's down to 13200.
I have replaced coils, plugs, done valve clearances, a leakdown test, replaced the reggy Rec, removed and replaced the dash, had my ecu in another bike which did not replicate the same problem, have normal charge rates hot and cold, a fully functioning stator.... Most recently tested the cam, crank and throttle position sensors, even put another throttle position sensor on just to check. Bypassed the kill switch just incase, disconnected the thermo fan and left handlebar switch block. Zeroed the ecu tune.
None of the above has had ANY effect.
Any one heard of an issue like this before?
The severity of the issue, and the relationship with heat has us looking around for spark/electrical related issues, as apposed to fuel blockages and such, which would not be so pronounced.
I and every one around this bike including some very reputable mechanics are stumped.
Any help and suggestions are welcome.