1998 Johnson Evinrude "EC" 125C, 130, 200, 225, 250 90 deg LV Service Manual, P/N 520212, Page 115Get this manual
Recirculation System Servicing
Important disfunctional recirculation system will cause one or more of the following operational symptoms: Erratic or poor idle characteristics Fouled spark plugs in lower cylinders Excessive smoke when accelerated after extended idle Idle quality unusually sensitive to trim angle
Before proceeding with these tests, the engine's operating temperature must be above the minimum specifications listed in Section 4Function Test at Cylinder BlockAll Models
1Connect an 1a in1.0clear vinyl hose between the cylinder block hose fitting and syringe filled with isopropyl alcohol2Press lightly on the syringe plunger: Fluid should move freely through the fitting If fluid does not move freely through the fitting, clean fitting with Jrv'k: Nipple Cleaning Tool, PIN 3266236784
3Repeat Steps and for each cylinder block fittingFunction Test at Inline Check Valve -
1Disconnect the inline check valve from the recirculation system[] 2Connect an 1fa in1.0clear vinyl hose between fitting and syringe filled with isopropyl alcohol[] 3Press lightly on the syringe plunger: Fluid should only move freely through fitting If fluid moves freely through fittingreplace the inline check valve[] 4syringe Move the vinyl hose to fitting Press lightly on the plunger: Fluid should only move freely through fitting If fluid moves freely through fittingreplace the inline check valve