1988-1994 Honda TRX300 Fourtrax, 1988, 1990-1994 TRX300FW Fourtrax Service Manual, Page 60Get this manual
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FUEL SYSTEM Remove the compression spring and diaphragmvacuum pistonInspect the vacuum piston for wear, nicks, or ther damageMake sure the piston moves up and down freely in the chamberSPRING
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