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So I inherited my grandfather's boat & motor when he passed away. It's a 18hp 1961 Evinrude Fastwin, the boat itself is in good condition but the motor is guzzling gas. Not even going full throttle here, it'll chew through 10 gallons in less than an hour! Fuel tank isn't leaking but besides that I'm lost.

I'd just like a general idea what'd cause this rather than shelling out $300. I could use that towards a newer motor instead (if needs be)

First thing:

Compression test;

1 - Start engine and warm her up.
2 - Remove all spark plugs and disconnect fuel line.
3 - Screw gauge into #1.
4 - Turn engine over until reading on gauge stops increasing or 5 times, whichever is more.
7. Repeat #5&#6 for the second cylinder.

PSI readings should be within a 10-15% span.

* Rope start engines will usually give lower psi readings than your know-it-all neighbor claims are required.

My 2 18hp Evinrudes are@ 120psi...(That is excellent for the years: 71 and 72)

Once you have found that the compression is acceptable, then you know that the motor is worth rebuilding/rehabilitating.


Get a carb rebuild kit.
Condenser replacement
Coil Replacement
Fuel pump (I am not certain what year they went from pressurized fuel tanks to mechanical fuel pumps...)

Here is the list of parts I recently bought for mine:

18-7222
Carburetor Kit - $20.25

18-5002
Tune Up Kit (Condensers) $21.29

18-3377
Water Pump Kit - $23.06

18-2684
Lower Unit Seal Kit - $18.05

18-5181
Ignition Coil
x2 $22.38 = $44.76

18-7823
Fuel Pump Kit - $11.24


SubTotal: $138.65
Shipping: $16.95
Tax: $7.77
Total: $163.37

Part numbers for yours might be different because of the year... but they may be the exact same. The coils and condensers will be the same... the carb kit too...

You get all this done, and you will have one dependable motor that will never let you down.

it may be that the carb float is sticking and the overflow is draining out the overflow tube. one way to tell for sure is to run it in a barrel and see if the fuel accumulates on top of the water.

Right on, thanks a bunch. Looks like a weekend project just to test her out though hah. Where'd you find your parts for it?

Trisomy21 wrote:Right on, thanks a bunch. Looks like a weekend project just to test her out though hah. Where'd you find your parts for it?

Be patient... and try to photograph everything you do in case you take something apart that you forget how to put back together!

http://www.marinemanifold.com/c-2-johns ... parts.aspx

They are a BC company that ships out of somewhere in Ontario.

Craig

Ahh thanks again. Yeah if it turns out its worth fixing I'll probably just buy the service manual for it and take lots of pictures.