Whenever i get up to a high rpm in any gear my 300 breaks up pretty bad. I put a White Bros E-series on and it ran prefect for almost a year but i took it out today, put fresh gas in it and it sputtered everytime I get to a high rpm. Can I clean the carburator or adjust it. Just let me know what you guys think. THANKS

 

maybe ur hitting the rev limiter

 

It never sputtered like that before and it starts around the rpm that I would shift at.