Help

Lastnight I finally got to pick my 450 up from the shop, Well when i got there i hopped on it and took it down the road and i noticed it sputtered really bad, the only time it doesnt is when its idleing and acceleration. when i got back up to his shop i asked about the sputtering and he said i didnt let it warm up long enough, So i went and got some race fuel this mornin and started my break-in process, on start up i let it sit and idle/warm up for 10 mins....then i got on it and took off and the sputtering was worse and the only times it doesnt is on acceleration and idling like before,

he told me it was jetted a little rich due to him not being able to get an hrc needle, but he put a dyna jet needle it in i think, im not sure what he said i was so excited about gettin it back. BUt

The upgrades where a 13.5.1 weisco...and i was just wonderin will it do this until its broken in good or what?
Is it my jetting?
HELP

i need to get this lined out