Finally got the carb issues taken care of, and it starts and runs okay, but after a couple
of minutes it will quit pumping water. I dropped the gear case and found no issues with
the metal impeller, or any pluggage. The test barrel needed cleaned anyway, as it looked
like chocolate milk! Drained, scrubbed, refilled with clean water. Motor still does the same
thing. If you shut if off, and restart it, it pumps water great again, …. for a couple of minutes!
Perhaps it would not do this if the motor was on a boat, but a PITA just to find out.
I was hoping to get all the bugs out before the lake test.
I’ve tried running the motor slower, and it will still quit pumping water in two minutes
or less.
Does the prop seem too large / aggressive for a 4 hp, perhaps causing cavitation?
It’s 8-1/2″ diameter…… no idea on the pitch.
I made a new, lower groove in the float pin clip, so I could lower the fuel level
an 1/8″ or hair more. That seem to do the trick as fuel isn’t oozing out of the cover
now, and it’s starting good. It still likes to run with the needle 1/8″ turn open though.
I can’t remember what shape the needle or seat is in.
VIDEO
https://youtu.be/WGfp1-Pc5Ws
I used my mini tubing cutter to scribe a new groove in the float pin.
Seemed to work okay.
Impeller was nice and tight on the driveshaft, and nothing was binding
or rubbing.
Does the 8-1/2″ prop seem too big for a 4 hp?
Prepare to be boarded!