1985-1995 Polaris ATV and Light Utility Hauler Service Manual, Page 373Get this manual
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ENGINESCARBURETION 1988 Trail Boss Trail Boss 4x4
+20+40 155 150 140 130 125
+40+60 150 145 135 125 120
+60+80 145 135 130 120 115
+80+100 140 130 1