ive got a 450r which sat in my building for 10 months with out being started. when i tryed running it the other day it would sputter real bad when i shot the gas. i tryed the spark plug and drained the gas and put new in, im thinking it might be the cdi box. any ideas or suggestions?

 

This is very common with machines that sit and modern fuel formulations! Fuel dries up in the carb and leaves behind a scum that cloggs the jets, particularly the slow (idle/pilot) jet. Dump the old fuel out of the tank and replace it with fresh, and clean the carb paying particular attention to the slow jet. Readjust the fuel screw when you reinstall the carb......