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View Full Version : atc/trx factory jetting differences



fordnut79
10-31-2013, 05:02 PM
The factory jetting specks for the 86 trx250r are 150 main and 48 pilot;
while the 86 atc250r specs out at 145 main and 42 pilot. Same year , same motor ,the exhaust looks very similar that year,
anybody have an opinion