Is the bike totally stock ?

If it has an aftermarket can/pipe or even an airfilter , I'd say your lean on top and need to go up a size or 2 in the main jets.

 

that could be it maybe. i do got an exhaust. it came on the bike when i bought it

 

Get it up to where it starts stuttering..then pull in clutch/kill motor at same time. Coast to a stop and pull a plug. If it looks like it just came out of the box, you're on lean side. You want a light brown/cream color on the ceramic.

 

I'd say that's it then. Either they never rejetted the carbs or never finished. .

 

ight, well i pulled the plugs, and the second one from the right was fouled out. the other three were pretty clean, white and stuff.

so maybe the plug is haveing something to do with it breaking up high end? gonna buy a new set next week and see what happens

 

That could definitely be it. RR's are notorious for fouling plugs.

 

i really hope so. is their a way to check what kind of jets are in the bike. or a good jet kit?

 

You'll have to remove bowls to get a good look at the jets. Remove the needles to see if a jet kit has been installed. If needles are adjustable (have notches at the top) then it has a kit. If plugs looked good as you say, no need to throw more money at it.

 

changed the plugs two days ago, and now the bike seems to be running alot better. havent noticed it stutter up top yet. hope this fixed my problem.