new ones stretch easy. here's thing I noticed, a regular sized bottle of beer is almost the exact size of a 39mm carb end. When stretching my boots thats what I used to get it to stretch and if you put the boot w/bottle in the end in the freezer, it will hold the size making it far easier to get the carb on. On a new intake tube, this shouldn't be needed, but it was in my situation, 85/86 atc250r air tubes are discontinued, I had no choice but the heat and stretch the old tube.
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