If your carb spacer is white (nylon?) on an older Brison, it needs to be replaced with the new black spacer. Like you found out, the old white one gets soft in the heat and this can cause problems. That's why the new ones use a black spacer made of a different material that will take the heat. Harvey updated my 10 year old Brison 3.2 about a month ago with the black spacer.