diff --git a/code/datums/research_upgrade_datum.dm b/code/datums/research_upgrade_datum.dm
index 378256ef123a..3700f7d6e4f8 100644
--- a/code/datums/research_upgrade_datum.dm
+++ b/code/datums/research_upgrade_datum.dm
@@ -115,10 +115,11 @@
 /datum/research_upgrades/item/flamer_tank
 	name = "Upgraded Incinerator Tank"
 	desc = "An upgraded incinerator tank, with larger capacity and able to handle stronger fuels."
-	value_upgrade = 500
+	value_upgrade = 200
 	clearance_req = 1
-	change_purchase = -100
+	change_purchase = 100
 	minimum_price = 100
+	maximum_price = 800
 	item_reference = /obj/item/ammo_magazine/flamer_tank/custom/upgraded
 	behavior = RESEARCH_UPGRADE_NULL
 	upgrade_type = ITEM_ACCESSORY_UPGRADE
@@ -129,8 +130,9 @@
 	value_upgrade = 100 //not useful enough to be expensive
 	clearance_req = 1
 	item_reference = /obj/item/ammo_magazine/flamer_tank/smoke/upgraded
-	change_purchase = -100
+	change_purchase = 50
 	minimum_price = 100
+	maximum_price = 500
 
 /datum/research_upgrades/armor
 	name = "Armor"