1990 Johnson Evinrude 120 thru 140, 185 thru 225, 300 HP, P/N 507875, Page 88Get this manual
Pulse limiter Fitting The pulse limiter fitting for the pulse hose has an integral valveThe valve is not serviced separately, but must be clean to allow normal operationA clogged valve might restrict fuel and oil supply, causing serious powerhead damage1Remove the pulse limiter fitting from the crankcase (V4) or pulse hose (V6V8)f71 2Back flush the valve with mild aerosol solvent to remove any carbon deposits 9663
If excessive carbon deposits are found, the engine must be checked for causes of backfiring before being returned to the customer Incorrect linkage adjustments Incorrect engine temperature Crankcase air leaks Carburetor problems Extended use of flushing attachment3Clean the threaded portion of the fitting and apply OMC Pipe Sealant with Teflon V6va ModelsPosition the fitting in the pulse hose with black nipple facing