it looks pretty simple..i have never touched them before..just wanna know if there is anything special to do this?? looks like 4 bolts and it pops off?? i just wanna check it to see if they look clean or not..if they are dirty or stuck open what do u guys do to clean them off? use some sort of carb cleaner or something to clean em out??? let the fire chief know...i just dont wanna start doing it and figure out theres something i did wrong ..thanks!