1988-1994 Honda TRX300 Fourtrax, 1988, 1990-1994 TRX300FW Fourtrax Service Manual, Page 63Get this manual
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FUEL SYSTEM PRIMER KNOB Install the primer knob with the spring into the float chamber(1) DIAPHRAGM,
(2 BAFFLE
Install the float and float valve in the carburetor body, then