L1 GSXR 600 hits a wall at 4500 RPMs one ride, rides like a top the next
Today I was out for some rides. Temp was 50+. First ride once I hit 3rd gear and up, I noticed the bike hit an acceleration wall between 4500 and 5,000 rpms where slowly rolling on the throttle produced laggy acceleration. Even when the bike got to at least 170 degrees and higher rpms, the performance was loagy. I road about 8 miles.
Bike sat for about 15 min., and the next ride of 8+ miles it ran like a top. What could cause this? My gas mileage is still down around 32 mpg because of no interstate riding this tank full. Usually my mileage with this riding was 38, and 45 if I had a bunch of hgwy. Miles.
Still no FI light, plugs and air filter are fine. When I cleaned the injectors they were fine. Coils tested perfect in the resistance tests. I get same performance if I unplug the O2 sensor. EXCA motor is unplugged, and SET valve is wide open. Thanks for the help!