Ok so I just finished first 24hr oil change. I drained tank and crankcase plug, and filter. I did not remove oil screen or vent tube. Added 2 quarts PS-4 oil. Is is necessary to clamp vent hose for ten seconds to prime pump? The reason I ask is the manual if i read it right says it's only necessary if you remove the screen and or vent hose? I clamped it for a few seconds to be sure but how am I to KNOW FOR SURE so I don't burn up the engine. Also will a low oil pressure warning lamp show on the speedo? I cranked it and its not knocking but just want to be sure. Thanks for your help. P.S. My youtube adobeflashplayer is acting up right now so its a no go there........