Re: 1948 evinrude 3.3 sportwin specs/help

[sportwindude]

Gary, Bucc,

Thanks for the help!

I was able to dial in the mixture screw to get the little hole under the main outlet to stop leaking.
I found old Evinrude literature that explained how to set the mixture screw. The OFF on the dial really means OFF when seated on this Carb!
I am more used to setting a mixture screw 1-1/2 turns out or so for initial startup.

However, I believe Gary is quite correct about the float not sealing at the point of contact between the bowl-hole and the needle valve taper.

Some History:

Through it’s 65 years, This old girl was messed with quite a bit. Either by owners or bad marine mechanics.
The motor is pretty complete. I even have the side cover tins!
I am a precision machinist by trade. Getting the Carb and fuel system apart was a challenge. There were many slotted fasteners that were mangled from slippage with the universally loved slotted screwdriver! Us machinists live in a word of Allen-Head/Hex Key fasteners. There is not much other style used in a machine shop. Hex is a distant second even! Anyways, I was able to restore the old slotted fasteners by hand lapping down the (Doh’s!) and even re-cutting the slots.

Which leads me to the Float Bowl:

When I had the Carb. all apart. I noticed a burr around the hole where the needle valve seats. Being a machinist, I took a 90 Deg. M.A. Ford Uniflute Contersink by hand and gave the hole a light twist to remove the burr.

Now, I doubt that the .005 de-burring job I performed would cause the needle valve not to seat….but.

If I leave (2-5 min) the fuel petcock on. And if I leave the mixture screw set to five. The engine will flood and be hard to start.
The leak I had before under the output hole is fixed. (I adjusted float all the way down with just maybe .030-.040 worth of needle open/close play)
But now, 2-5 minutes later, at the above settings, the fuel will leak into the engine and flood.

So to remedy this, at every fishing stop, I must remember to shut the petcock off (made a nice knurled brass knob for that) shut the mixture screw to OFF. And turn the throttle to STOP.

Then when ready to go again. Reverse the procedure.

It works, but I still feel I am missing a small detail? Maybe the lap-job is in order on the needle valve?

I will get into it again this winter. I will try to take pictures and post my work. The entire outboard needs paint. So once I am happy with the performance, I intend to strip her down, Zinc Cromate prime and paint her up!

Any suggestions on factory colors and where to get them??

Thanks again for all your help and interest.

John – SportwinDude