The soft rev limiter retards the ignition at around 9200 RPM.
By removing the soft rev limiter, it allows full ignition advance up to the 10,200 RPM redline hard limit.
No idea why they did it. Probably legal reasons.
After all, many bike have ECU controlled ignition retardation.
Suzuki's for one.
The Hayabusa and TL1000R both had this in the lower gears.
Supposedly, on the 'Busa, only 5th gear had full advance as 1st through 4th were retarded, and 6th was retarded to hold the speed down the 186 MPH agreed upon max speed by the manufacturers.
The TRE (Timing Retard Eliminator) modules worked around this by tricking the bike into thinking it was always in 5th.
Last edited by SubSailor; 07-01-2011 at 04:57 PM.