1986-1987 Honda TRX350 FourTrax 4X4, 1987-1989 TRX350D Foreman 4X4 Service Manual, Page 291Get this manual
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TROUBLESHOOTING Probable Cause
1 Check if air is leaking past carburetor insulator
NOT LEAKING
LEAKING
Deteriorated insulator O-ring Loose carburetor