I have a honda cbr600 when i gat to 6000revs at 65-70mph my bike starts to surge up and down ?

Question

if i increase speed no problem it goes its just when i try to hold a steady speed after 65-70mph anybody help tried what i know .

Answer 1

CBR600F3

CBR600F4

CBR600F4i

CBR600RR

WHICH ONE?

Answer 2

Sounds like a carb issue, or you may just have some bad old gas.

Answer 3

Run 2 gallons of 100 octane in with 2 gallons of 93. If you don't notice a change, have your carbs cleaned and resync'd

Answer 4

mixture screws too lean.. lean mixture is usual cause of steady throttle surging.. lift the needles a notch... plug up holes not standard in air box.....manifold leak?

Answer 5

if its the carb'd model check them over..fuel injection model,to your knowledge has it ever been chipped?...sounds like a timmimg/ignition/ecu problem

Answer 6

you might be in too low of a gear....up shift a gear will be easier to hold the speed steady.....get a PC2 or 3 or 3r....it'll helps a bunch!