the corona is a st141.i do think my carbie is a bit dirty becasue when i take my foot of the gas in second quickly it will jerk around a lot. and also every morning when i turn it on i will give it gas and will jsut turn off then when u turn it on again it will idle higher till its warm. im pretty sure this is the carbie ive tried to put injector cleaners and shit in but they havent done anything.