1986-1989 Honda TRX250 FourTrax 250R Service Manual, Page 50Get this manual
FUEL SYSTEM
ALTITUDE AND TEMPERATURE ADJUSTMENT
The carburetor must be adjusted for altitude and temperature according to the chartSTANDARD SETTING: Main jet Jet needle setting Air screw opening
After '88:
# 150152 #158 #155
4th groove 4th groove 3rd groove 4th groove
1-78 turns out 1-78 turns out
'-34 turns out
1-12 turns out
Temperature (OF)30- 17.5 (-22-0)86: Ma in jet (#) Jet need le setting
Air screw
-17 .55 (0 -22) After '8815586148 '87150 3rd 212 urns out 150 152 4th 14 tu rns out turns out 52 155 4th turn out turns out 1-111 4 turns out turns out 1-34 1- 12 turns out turns out 160 58 150 4th turns out 158 134 turns out 15588155 After '88: 152 '8 6: 145
-5-40 (22 -1 04)87: 148 2nd 12 turns out 148 150 3rd turns out 152 3rd 158 1-34 turns out 55 4th88: 152 After '88: 150
'87: 152 4th
opening Main jet (#) Jet needle setting
A ir screw
2 turns out 152 55
1-3 112 turns out turns out 160 5th 158
t urn out 55
2 turns out 152