hello i just got my 2000 CBR 600 F4 and i changed everything spark plugs, oil, filters, and all that good stuff. the bike starts up really nice and idels really nice and takes off really nice from a stop but when i get to about60 MPH or 3rd gear the bike bogs down if i turn the throtel to the max it will put put for awhile then it will just take off like it should, but once i i let off the gas it will start putting again..... so could my carbs be out of sync? or not opening? idk please give me ideas!

 

well ran some sea foam and tested all the spark plug wires and whatnot and put it all back together and now it runs like new!

 

if it was a spark plug issue u would notice imediately when starting off, if ur idle is steady ur cabrs should be in synch, what bout a sensor like the TPS (Throttle Position Sensor)?

 

Check and make sure that the air box is sealed up tight on the carbs.