Workin on a 02 foreman 450 4×4 foot shift with the switch to go from 2×4 to 4×4 it sat up for a while I cleaned out the fuel tank replaced the petcock rebuilt the carb about 4 times before putting a new rebuilt kit in the carb. New intake boot where the carb mounts to the head cause it was cracked. Checked valve timing it’s perfect and replaced voltage regulator. Starts up fine idles prefect inneutral and in gear and throttles up alright cold but as soon as itgets warm u ccan’t go over quarter throttle in gear or it dies but if u shit back to neutral quick when it’s shutting off it will idle perfect I replaced the voltage regulator and that seam to fix it for about 30 mins then right back to the same thing. I NEED HELP PLEASE