any ideas on sputtering issue

[ICER88]

had the r out today and started great idles great gos throught 1,2,3,4 but in 5th gear high rpms it seems to sputters. what could this be? any ideas would be great

[89250rhonda]

is yor air filter clean? have you got fresh fuel in the tank? it could be short of fuel, try cleaning your carb out you could have a slight blockage in your main jet.....