1994 Johnson Evinrude "ER" 60 LV 150, 150C, 175 Service Repair Manual, P/N 500611, Page 66Get this manual
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Pulse Limiter Fitting
Backflush the valve with OMC Carburetor and Choke Cleaner to remove any carbon deposits
If you find excessive carbon deposits, check the engine for causes of backfiri