- This topic has 18 replies, 4 voices, and was last updated 1 year, 7 months ago by
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Here is a spec chart. You just have to figure out
what Evinrude has that carb. My guess would be
Handitwin. Experimenting – I found that not enough
lift – motor won’t reach full RPM. Too much lift –
they run way rich making difficult, if not impossible,
to get the motor leaned out. May explain your
mixture setting.
Tubs.
A "Boathouse Repair" is one that done without having tools or the skills to do it properly.
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!
OK, so here’s the new float I put in my Sea King 3hp. It’s about 3/4″ in height, same as the old float. The distance between the top and bottom retainer clips on my carb is about 1.25″ so with the new float installed up against the top clip, there’s about 1/2″ between the bottom of the float and the bottom retainer clip. Seems to me that the thinner the float, the more fuel would enter the bowl before it reaches the float and raises the float pin to cut off the flow. Just trying to avoid a fuel overflow through the cover like you had and wondering if I need to use a taller float. Thoughts?
Bob
1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."
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