Fixed it

code/game/objects/items.dm

@@ -341,6 +341,10 @@ var/global/image/fire_overlay = image("icon" = 'icons/goonstation/effects/fire.d
 /obj/item/proc/on_found(mob/finder as mob)
 	return
 
+// called when the giver gives it to the receiver
+/obj/item/proc/on_give(mob/living/carbon/giver, mob/living/carbon/receiver)
+	return
+
 // called after an item is placed in an equipment slot
 // user is mob that equipped it
 // slot uses the slot_X defines found in setup.dm

code/game/objects/items/weapons/twohanded.dm

@@ -147,6 +147,14 @@
 		wield(user)
 	..()
 
+/obj/item/twohanded/required/on_give(mob/living/carbon/giver, mob/living/carbon/receiver)
+	var/obj/item/twohanded/required/H = receiver.get_inactive_hand()
+	if(H != null) //Check if he can wield it
+		receiver.drop_item() //Can't wear it so drop it
+		to_chat(receiver, "<span class='notice'>[src] is too cumbersome to carry in one hand!</span>")
+		return
+	equipped(receiver,receiver.hand ? slot_l_hand : slot_r_hand)
+
 /obj/item/twohanded/required/equipped(mob/user, slot)
 	..()
 	if(slot == slot_l_hand || slot == slot_r_hand)
@@ -438,7 +446,7 @@
 	if(on)
 		playsound(loc, 'sound/weapons/chainsawstart.ogg', 50, 1)
 	force = on ? force_on : initial(force)
-	throwforce = on ? force_on : initial(force)
+	throwforce = on ? force_on : initial(throwforce)
 	icon_state = "gchainsaw_[on ? "on" : "off"]"
 
 	if(hitsound == "swing_hit")
@@ -453,6 +461,16 @@
 		var/datum/action/A = X
 		A.UpdateButtonIcon()
 
+/obj/item/twohanded/required/chainsaw/attack_hand(mob/user)
+	. = ..()
+	force = on ? force_on : initial(force)
+	throwforce = on ? force_on : initial(throwforce)
+
+/obj/item/twohanded/required/chainsaw/on_give(mob/living/carbon/giver, mob/living/carbon/receiver)
+	. = ..()
+	force = on ? force_on : initial(force)
+	throwforce = on ? force_on : initial(throwforce)
+
 /obj/item/twohanded/required/chainsaw/doomslayer
 	name = "OOOH BABY"
 	desc = "<span class='warning'>VRRRRRRR!!!</span>"

code/game/objects/structures/flora.dm

@@ -211,6 +211,7 @@
 	layer = 5
 	w_class = WEIGHT_CLASS_HUGE
 	force = 10
+	force_wielded = 10
 	throwforce = 13
 	throw_speed = 2
 	throw_range = 4
@@ -222,6 +223,7 @@
 		icon_state = "plant-36"
 
 /obj/item/twohanded/required/kirbyplants/equipped(mob/living/user)
+	. = ..()
 	var/image/I = image(icon = 'icons/obj/flora/plants.dmi' , icon_state = src.icon_state, loc = user)
 	I.override = 1
 	user.add_alt_appearance("sneaking_mission", I, player_list)

code/modules/mob/living/carbon/give.dm

@@ -56,6 +56,7 @@
 				target.update_inv_l_hand()
 				target.update_inv_r_hand()
 				target.visible_message("<span class='notice'> [usr.name] handed \the [I.name] to [target.name].</span>")
+				I.on_give(usr, target)
 			if("No")
 				target.visible_message("<span class='warning'> [usr.name] tried to hand [I.name] to [target.name] but [target.name] didn't want it.</span>")
 	else