Yes it will be getting hot very quick because it will be pushing its MAX amp loads all the time. go check out Brushlesshobbys.com they have an 120a and 60a esc that are rebranded Hobbywing stuff. Very very good quality and I heard they stand by what they sell on that site. The 120A which is WAY WAY overy kill for your b4.1 is around $58 SHIPPED and the 60A is around $45 shipped! be sure to get a LCD program box to get the most out of it and you will have a Killer Esc.