1997 Johnsoon Evinrude "EU" 50 thru 70 3-Cylinder Service Manual, P/N 507266, Page 73Get this manual
Pulse Limiter Fitting []] The pulse limiter fitting for the VRol pulse hose has an integral check valveThe check valve is not serviced separately, but must be clean to allow normal pump operationI Note clogged check valve might restrict
supply, causing serious powerhead damage
fuel and oil
1Remove the pulse limiter fitting from the crankcase[] 2Backflush the valve with OMC Carburetor and Choke Cleaner to remove any carbon depositsI Note 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 attachment
3Clean the threaded portion of the fitting and apply OMC Pipe Sealant with Teflon4Install the fittingSecure the pulse hose with ratchet clampPump For functional tests of the System, this section